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Lesley Cohen | London Centre for Nanotechnology

Prof Lesley Cohen

tel: +44 (0)20 7594 7598
ext: 7598
office:

Blackett Laboratory

Research interests:

Semiconductor optoelectronics
Molecular electronic materials and devices
Transport and magnetism
Adiabatic cooling
Awards and honours: 

Royal Society Research Fellowship 1995-2004, Royal Society, 1995

External positions held: 
  • Business Fellow, London Technology Network 2003-2006
  • Executive Board Member, Superconductivity, Science and Technology 2000 to date
  • Technical Co-ordinator, EU funded programme MOSAIKS 2001-2004
  • Organiser, IoP Applied Superconductivity Meeting, Birmingham Nov 3rd 2004
  • Judge for UK (organised through IoP), SET- UG student of the year awards- August 2004
  • Board Member, Education Board for the IoP- Sep 2004 to date
  • SERS organisation committee, Faraday Discussion Meeting- Sep 2005
  • Board Member, ICON 2004-2006
  • Joint Committee Member, AUT 2004 to date
  • Chair, Faculty Proof of Principle Fund (awarded £0.5m in 2004)
  • Panel Member, EPSRC Materials Strategic Advisory Technical (SATS) 2003-2005

Other

  • Initiated and organised a Royal Society discussion meeting “Understanding and Utilising CMR materials” Oct 1-2 1997.
  • Programme committee of the Applied Superconductivity Conference, Virginia Beach, September 2000. Chairman of several sessions at the meeting.
  • Advisory board member of Superconductivity Science and Technology, 1999-2000
  • Executive Board member of Superconductivity, Science and Technology, 2000 – present
  • Technical Co-ordinator for EU funded programme – MOSAIKS 2001-2004
  • Joint Committee Member of AUT 2002 -
  • Departmental committee member for Review panel for Technical Staff Promotions -2003
  • Board member of ICON representing the Faculty of Physical Sciences 2003-
  • Chair of Departmental Technology Transfer committee 2003 –
  • Member of the Materials Strategic Advisory Technical (SATS) Panel for the EPSRC 2003 -
  • London Technology Network Business Fellow for LTN from 2003 -
  • Chair of Faculty of Physical Sciences – Proof of Concept Fund Committee- 2004 (Awarded sum £0.5M in total)
  • Organised IoP Applied Superconductivity Meeting, Birmingham November 3rd 2004
  • Royal Society Science Summer Exhibition – SERS stand (together with the NPL): July 2004
  • Judge for the SET – UG Student of the Year Awards (organised through the IoP): August 2004
  • Faraday Discussion Meeting organisation committee chair – SERS meeting
  • September 2005 (at Imperial College) I was the Editor of the Proceedings Faraday Discussions Vol 132.
  • Organised Superconductivity IoP meeting June 2006-07-13
  • Organised Spintronics Session at III-V meeting, Sheffield – July 2006
Research: 

Over the last few years we have built up a suite of novel characterisation tools for Functional Magnetic Materials. We can identify four main areas; a) ultra thin narrow gap semiconductors for magnetic sensor technologies; b) superconducting materials for low field portable MRI technology; c) materials that allow the harnessing of electron spin; d) materials for room temperature magnetic refrigeration (giant magnetocalorics). We have established some research activities in these areas but to differing extents as outlined below.

a) Magnetoresistance sensors based on Narrow Gap Semiconductors (NGS): With recent EPSRC support we have worked on the growth, novel structural characterisation and magnetotransport properties of sub micron InSb epilayers for sensor and hybrid Spintronic applications. The InSb films on GaAs (100) grown by the Imperial recipe exhibit considerable improvement in the range 60 nm to 300 nm over values reported elsewhere. We have used these films to make preliminary exploration of the geometric manipulation of magnetoresistance together with collaborators at Toshiba Laboratories Cambridge and Prof Stuart Solin from Washington University in St Louis who is currently an EPSRC visiting fellow at Imperial College.

b) Superconducting Materials: The effort in superconductivity research is an established activity in the group and we have an internationally recognised reputation in the development of characterisation tools such as length-scale analysis for examining the connectivity issue, flux creep (and the E-J-B surface), Hall probe imaging and a fast and ultra-sensitive calorimeter for studies of heat capacity of very small samples in high magnetic fields. More recently we have developed point contact spectroscopy (PCS) as a means to chart the evolution of the superconducting energy gap (D) in magnetic field and have developed a two-channel model to interpret PCS data and to extract the diffusivity ratio between the two bands in epitaxial thin films of MgB2 superconductors. Understanding of vortex pinning in MgB2 is incomplete, but we have studied single crystals and have shown that the pinning can be enhanced at intermediate fields, rather effectively, by point disorder, highlighting the role of the underlying order – disorder transition in the vortex lattice. We have also studied the anisotropy of pinning properties and critical fieldsin single crystals and the gap structure, critical fields and microwave properties of MgB2 thin films. We are also using Hall probe imaging to study interactions between Josephson and pancake vortices as the basis of establishing Flux Rachet concepts.

c) Harnessing Electron Spin: Over the last few years the group have been funded to look at highly spin polarised magnetic oxides such as manganites and CrO2 as well as Heusler alloys such as NiMnSb and Co2MnSi. We have developed Andreev PCS in order to determine the free surface transport polarisation and anomalous Hall transport studies to study the nature of the transport carriers in these important ferromagnetic metals. Planar Andreev spectroscopy is being developed in a joint program with the University of Cambridge.

The group are also participating in an EPSRC Spintronics consortium involving Surrey University, Cambridge University and QinetiQ, Malvern., , Imperial and to engineer the interfaces between NGS and ferromagnetic metals to optimise spin injection and detection.

d) Materials for Magnetic Refrigeration

The intermetallic compound Gd5Ge4 is a lanthanide based, naturally layered antiferromagnet (AFM), studied in part because it is one of the parent binary compounds to a family of Gd5(SixGe1-x)4 giant magnetocaloric metamagnetic materials. We have very recently begun a novel program studying polycrystalline samples using scanning Hall imaging and global magnetometry. We were the first to demonstrate that nucleation and growth dynamics related to the first order disorder broadened phase transition in these materials, controls the key macroscopic magnetic behaviour in magnetic field. Moreover we observe the magnetic field required to complete the phase transition that is critical for the magnetocaloric application is reduced by up to 20% when small fragments each made up of several randomly oriented crystallites are removed from the bulk of the sample (see figure 1). We propose that the removal of the competing strain fields from neighbouring grains when the fragment is embedded in the bulk underlies the observation. These observations move the field in a really new direction. We have set up methods to analyse the material performance bridging the microscopic imaging and global magnetometry We are very keen to transfer our expertise here to the more technologically relevant room temperature metamagnetic systems such as Gd5(SixGe1-x)4 as well as other metamagnetic compounds that show similar global properties. It is a highly adventurous program with unquestionably high potential returns.

Publications
Journal Articles

  • Magnus, F, Wood, B, Moore, J, et al , A d.c. magnetic metamaterial, NAT MATER, 2008, Vol: 7, Pages: 295 - 297, ISSN: 1476-1122
  • Maher, RC, Cohen, LF, Raman spectroscopy as a probe of temperature and oxidation state for gadolinium-doped ceria used in solid oxide fuel cells, J PHYS CHEM A, 2008, Vol: 112, Pages: 1497 - 1501, ISSN: 1089-5639
  • Litvinenko, KL, Nikzad, L, Pidgeon, CR, et al , Temperature dependence of the electron Lande g factor in InSb and GaAs, PHYS REV B, 2008, Vol: 77, ISSN: 1098-0121
  • Magnus, F, Yates, KA, Clowes, SK, et al , Interface properties of Pb/InAs planar structures for Andreev spectroscopy, APPL PHYS LETT, 2008, Vol: 92, ISSN: 0003-6951
  • Yates, KA, Branford, WR, Magnus, F, et al , The spin polarization of CrO2 revisited, APPL PHYS LETT, 2007, Vol: 91, ISSN: 0003-6951
  • Sousa, PM, Dias, SA, Conde, O, et al , Influence of growth temperature and carrier flux on the structure and transport properties of highly oriented CrO2 on Al2O3 (0001), CHEM VAPOR DEPOS, 2007, Vol: 13, Pages: 537 - 545, ISSN: 0948-1907
  • Magnus, F, Clowes, SK, Gilbertson, AM, et al , Electrical characterization of MgO tunnel barriers grown on InAs (001) epilayers, APPL PHYS LETT, 2007, Vol: 91, ISSN: 0003-6951
  • Yates, KA, Miyoshi, Y, Grunwell, J, et al , The effect of magnesium vacancies on the pi intraband scattering in MgxB2 as determined by point contact Andreev reflection, APPL PHYS LETT, 2007, Vol: 91, ISSN: 0003-6951
  • Moore, JD, Perkins, GK, Branford, W, et al , The superconducting properties of co-doped polycrystalline MgB2, SUPERCOND SCI TECH, 2007, Vol: 20, Pages: S278 - S281, ISSN: 0953-2048
  • Gilbertson, AM, Orr, JMS, Buckle, PD, et al , Low-temperature Schottky barrier tunneling in InSb/InxAl1-xSb quantum well heterostructures, PHYS REV B, 2007, Vol: 76, ISSN: 1098-0121
  • Litvinenko, KL, Nikzad, L, Allam, J, et al , Spin dynamics in narrow-gap semiconductor epitaxial layers, J SUPERCOND NOV MAGN, 2007, Vol: 20, Pages: 461 - 465, ISSN: 0896-1107
  • Wang, H, Branford, WR, Cohen, LF, et al , Preparation of ferromagnetic cobalt substituted TiO2 (Anatase) thin films by electrochemical deposition, CHEM MATER, 2007, Vol: 19, Pages: 3084 - 3086, ISSN: 0897-4756
  • Kazakova, O, Gallop, J, Perkins, G, et al , Scanned micro-Hall microscope for detection of biofunctionalized magnetic beads (vol 90, art no 162502, 2007), APPL PHYS LETT, 2007, Vol: 90, ISSN: 0003-6951
  • Singh, LJ, Oliver, RA, Barber, ZH, et al , Preparation of InAs(001) surface for spin injection via a chemical route, J PHYS D APPL PHYS, 2007, Vol: 40, Pages: 3190 - 3193, ISSN: 0022-3727
  • Roy, SB, Chattopadhyay, MK, Banerjee, A, et al , Devitrification of the low temperature magnetic-glass state in Gd5Ge4, PHYS REV B, 2007, Vol: 75, ISSN: 1098-0121
  • Kazakova, O, Gallop, J, Perkins, G, et al , Scanned micro-Hall microscope for detection of biofunctionalized magnetic beads, APPL PHYS LETT, 2007, Vol: 90, ISSN: 0003-6951
  • Litvinenko, KL, Nikzad, L, Allam, J, et al , Spin lifetime in high quality InSb epitaxial layers grown on GaAs, J APPL PHYS, 2007, Vol: 101, ISSN: 0021-8979
  • Branford, WR, Singh, LJ, Barber, ZH, et al , Temperature insensitivity of the spin-polarization in Co2MnSi films on GaAs (001), NEW J PHYS, 2007, Vol: 9, ISSN: 1367-2630
  • Magnus, F, Yates, KA, Morris, B, et al , Prospects for detection of spin accumulation using submicron planar Andreev array spectroscopy, APPL PHYS LETT, 2006, Vol: 89, ISSN: 0003-6951
  • Sousa, PM, Dias, SA, Silvestre, AJ, et al , CVD of CrO2: Towards a lower temperature deposition process, CHEM VAPOR DEPOS, 2006, Vol: 12, Pages: 712 - +, ISSN: 0948-1907
  • Zhang, T, Harris, JJ, Branford, WR, et al , Exploration of the inherent magnetoresistance in InSb thin films, SEMICOND SCI TECH, 2006, Vol: 21, Pages: 1543 - 1546, ISSN: 0268-1242
  • Purnell, AJ, Hao, L, Gallop, JC, et al , Characterization of superconducting thin films using a generic property of resonators, J SUPERCOND NOV MAGN, 2006, Vol: 19, Pages: 633 - 636
  • Brown, E, Hao, L, Gallop, JC, et al , The effect of molecular oxygen on the thermal conductance of multi-walled Liu, FM, Kollensperger, PA, Green, M, et al , A note on distance dependence in surface enhanced Raman spectroscopy, CHEM PHYS LETT, 2006, Vol: 430, Pages: 173 - 176, ISSN: 0009-2614
  • Maher, RC, Cohen, LF, Le Ru, EC, et al , On the experimental estimation of surface enhanced raman scattering (SERS) cross sections by vibrational pumping, J PHYS CHEM B, 2006, Vol: 110, Pages: 19469 - 19478, ISSN: 1520-6106
  • Litvinenko, KL, Murdin, BN, Allam, J, et al , Spin lifetime in InAs epitaxial layers grown on GaAs, PHYS REV B, 2006, Vol: 74, ISSN: 1098-0121
  • Roy, SB, Chattopadhyay, MK, Chaddah, P, et al , Evidence of a magnetic glass state in the magnetocaloric material Gd5Ge4, PHYS REV B, 2006, Vol: 74, ISSN: 1098-0121
  • Maher, RC, Etchegoin, PG, Le Ru, EC, et al , A conclusive demonstration of vibrational pumping under Surface Enhanced Raman Scattering conditions, J PHYS CHEM B, 2006, Vol: 110, Pages: 11757 - 11760, ISSN: 1520-6106
  • Popovici, N, Jimenez, E, da Silva, RC, et al , Optical and magnetic properties of Co-doped TiO2 thin films grown by pulsed laser deposition, J NON-CRYST SOLIDS, 2006, Vol: 352, Pages: 1486 - 1489, ISSN: 0022-3093
  • Litvinenko, KL, Murdin, BN, Allam, J, et al , Spin relaxation in n-InSb/AlInSb quantum wells, NEW J PHYS, 2006, Vol: 8, ISSN: 1367-2630
  • Maher, RC, Cohen, LF, Gallop, JC, et al , Temperature-dependent anti-stokes/stokes ratios under surface-enhanced Raman scattering conditions., J Phys Chem B, 2006, Vol: 110, Pages: 6797 - 6803, ISSN: 1520-6106 ( publication )
  • MacManus-Driscoll, JL, Sharma, A, Bugoslavsky, Y, et al , Reversible low-field magnetoresistance in Sr2Fe2-xMoxO6-delta by oxygen cycling and the role of excess Mo (x > 1) in grain-boundary regions, ADV MATER, 2006, Vol: 18, Pages: 900 - +, ISSN: 0935-9648
  • Miyoshi, Y, Bugoslavsky, Y, Syed, MH, et al , Comparison of free surface polarization of NiMnSb and Co2MnSi, APPL PHYS LETT, 2006, Vol: 88, ISSN: 0003-6951
  • Murdin, BN, Litvinenko, K, Clarke, DG, et al , Spin relaxation by transient monopolar and bipolar optical orientation, PHYS REV LETT, 2006, Vol: 96, ISSN: 0031-9007
  • Moore, JD, Perkins, GK, Bugoslavsky, Y, et al , Reducing the operational magnetic field in the prototype magnetocaloric system Gd5Ge4 by approaching the single cluster size limit, APPL PHYS LETT, 2006, Vol: 88, ISSN: 0003-6951
  • Purnell, AJ, Hao, L, Gallop, JC, et al , Characterization of superconducting thin films using a generic property of resonators, J SUPERCOND NOV MAGN, 2006, Vol: 19, Pages: 107 - 110
  • Itskos, G, Harbord, E, Clowes, SK, et al , Oblique Hanle measurements of InAs/GaAs quantum dot spin-light emitting diodes, APPL PHYS LETT, 2006, Vol: 88, ISSN: 0003-6951
  • Zhang, T, Harris, JJ, Branford, WR, et al , Tuning the inherent magnetoresistance of InSb thin films, APPL PHYS LETT, 2006, Vol: 88, ISSN: 0003-6951
  • Maher, RC, Cohen, LF, Le Ru, EC, et al , A study of local heating of molecules under surface enhanced Raman scattering (SERS) conditions using the anti-Stokes/Stokes ratio., Faraday Discuss, 2006, Vol: 132, ISSN: 1359-6640 ( publication )
  • Singh, LJ, Barber, ZH, Kohn, A, et al , Interface effects in highly oriented films of the Heusler alloy Co2MnSi on GaAs(001), J APPL PHYS, 2006, Vol: 99, ISSN: 0021-8979
  • Green, M, Liu, FM, Cohen, L, et al , SERS platforms for high density DNA arrays, FARADAY DISCUSS, 2006, Vol: 132, Pages: 269 - 280, ISSN: 1364-5498
  • Bugoslavsky, Y, Miyoshi, Y, Perkins, GK, et al , Electron diffusivities in MgB2 from point contact spectroscopy, PHYS REV B, 2005, Vol: 72, ISSN: 1098-0121
  • Zhang, T, Harris, JJ, Clowes, SK, et al , Evidence for dislocation-related amphoteric behaviour of Si dopant in high-mobility InSb thin films, SEMICOND SCI TECH, 2005, Vol: 20, Pages: 1153 - 1156, ISSN: 0268-1242
  • Perkins, GK, Caplin, AD, Cohen, LF, Dynamic interactions between pancake vortex stacks and Josephson vortices in Bi2Sr2CaCU2O8 single crystals: relaxation and ratchets, SUPERCOND SCI TECH, 2005, Vol: 18, Pages: 1290 - 1293, ISSN: 0953-2048
  • Zhang, T, Hsieh, ML, Branford, WR, et al , Observation of bevelled GaSb/InAs quantum wells by Raman mapping, J RAMAN SPECTROSC, 2005, Vol: 36, Pages: 978 - 983, ISSN: 0377-0486
  • Murzyn, P, Pidgeon, CR, Phillips, PJ, et al , Suppression of D''yakonov-Perel spin relaxation in InAs and InSb by n-type doping at 300 K (vol 83, pg 5220, 2003), APPL PHYS LETT, 2005, Vol: 87, ISSN: 0003-6951
  • Sharma, A, MacManus-Driscoll, JL, Branford, W, et al , Phase stability and optimum oxygenation conditions for Sr2FeMoO6 formation, APPL PHYS LETT, 2005, Vol: 87, ISSN: 0003-6951
  • Miyoshi, Y, Bugoslavsky, Y, Minakov, AA, et al , Local enhancement of the upper critical field in niobium point contacts, SUPERCOND SCI TECH, 2005, Vol: 18, Pages: 1176 - 1178, ISSN: 0953-2048
  • Maher, RC, Hou, J, Cohen, LF, et al , Resonance contributions to anti-Stokes/Stokes ratios under surface enhanced Raman scattering conditions, J CHEM PHYS, 2005, Vol: 123, ISSN: 0021-9606
  • Murdin, BN, Litvinenko, K, Allam, J, et al , Temperature and doping dependence of spin relaxation in n-InAs, PHYS REV B, 2005, Vol: 72, ISSN: 1098-0121
  • Miyoshi, Y, Bugoslavsky, Y, Cohen, LF, Andreev reflection spectroscopy of niobium point contacts in a magnetic field, PHYS REV B, 2005, Vol: 72, ISSN: 1098-0121
  • Moore, JD, Perkins, GK, Caplin, AD, et al , Angular dependence of the order-disorder transition in proton irradiated single crystal MgB2, PHYS REV B, 2005, Vol: 71, ISSN: 1098-0121
  • Branford, WR, Husmann, A, Solin, SA, et al , Geometric manipulation of the high-field linear magnetoresistance in InSb epilayers on GaAs(001), APPL PHYS LETT, 2005, Vol: 86, ISSN: 0003-6951
  • Manoharan, SS, Singh, B, Driscoll, J, et al , Magnetism and mectronic transport in Sr4-xLaxRu2-xMnxO9: Interplay of Minakov, AA, Roy, SB, Bugoslavsky, YV, et al , Thin-film alternating current nanocalorimeter for low temperatures and high magnetic fields, REV SCI INSTRUM, 2005, Vol: 76, ISSN: 0034-6748
  • Bugoslavsky, Y, Miyoshi, Y, Clowes, SK, et al , Possibilities and limitations of point-contact spectroscopy for measurements of spin polarization, PHYS REV B, 2005, Vol: 71, ISSN: 1098-0121
  • Purnell, AJ, Cohen, LF, Hao, L, et al , Failure analysis of high temperature superconducting films at high microwave power using microsecond time domain measurements, APPL PHYS LETT, 2005, Vol: 86, ISSN: 0003-6951
  • Liao, XZ, Sharma, A, Wei, M, et al , Highly disordered intergrowths in Sr2FeMoO6, J APPL PHYS, 2004, Vol: 96, Pages: 7747 - 7749, ISSN: 0021-8979
  • Chattopadhyay, MK, Manekar, MA, Pecharsky, AO, et al , Metastable magnetic response across the antiferromagnetic to ferromagnetic transition in Gd5Ge4, PHYS REV B, 2004, Vol: 70, ISSN: 1098-0121
  • Zhang, T, Branford, WR, Trodahl, HJ, et al , Raman spectroscopy of highly aligned thin films of C7Sr2FeMoO6, J RAMAN SPECTROSC, 2004, Vol: 35, Pages: 1081 - 1085, ISSN: 0377-0486
  • Harris, JJ, Zhang, T, Branford, WR, et al , The role of impurity band conduction in the low temperature characteristics of thin InSb films grown by molecular beam epitaxy, SEMICOND SCI TECH, 2004, Vol: 19, Pages: 1406 - 1410, ISSN: 0268-1242
  • Maher, RC, Dalley, M, Le Ru, EC, et al , Physics of single molecule fluctuations in surface enhanced Raman spectroscopy active liquids., J Chem Phys, 2004, Vol: 121, Pages: 8901 - 8910, ISSN: 0021-9606 ( publication )
  • Etchegoin, PG, Maher, RC, Cohen, LF, Amplification of local fields in disordered metallic structures, NEW J PHYS, 2004, Vol: 6, ISSN: 1367-2630
  • Berenov, A, Serquis, A, Liao, XZ, et al , Enhancement of critical current density in low level Al-doped MgB2, SUPERCOND SCI TECH, 2004, Vol: 17, Pages: 1093 - 1096, ISSN: 0953-2048
  • Cohen, LF, Bugoslavsky, Y, Perkins, GK, et al , Magnetic properties of MgB2 in the presence of disorder, PHYSICA C, 2004, Vol: 408, Pages: 628 - 631, ISSN: 0921-4534
  • Maher, RC, Cohen, LF, Etchegoin, P, et al , Stokes/anti-Stokes anomalies under surface enhanced Raman scattering conditions, J CHEM PHYS, 2004, Vol: 120, Pages: 11746 - 11753, ISSN: 0021-9606
  • Debnath, MC, Zhang, T, Roberts, C, et al , High-mobility InSb thin films on GaAs (001) substrate grown by the two-step growth process, J CRYST GROWTH, 2004, Vol: 267, Pages: 17 - 21, ISSN: 0022-0248
  • Gardelis, S, Androulakis, J, Migiakis, P, et al , Synthesis and physical properties of arc melted NiMnSb, J APPL PHYS, 2004, Vol: 95, Pages: 8063 - 8068, ISSN: 0021-8979
  • Clowes, SK, Miyoshi, Y, Bugoslavsky, Y, et al , Spin polarization of the transport current at the free surface of bulk NiMnSb, PHYS REV B, 2004, Vol: 69, ISSN: 1098-0121
  • Singh, LJ, Barber, ZH, Miyoshi, Y, et al , Structural and transport studies of stoichiometric and off-stoichiometric thin films of the full Heusler alloy Co2MnSi, J APPL PHYS, 2004, Vol: 95, Pages: 7231 - 7233, ISSN: 0021-8979
  • Zhang, T, Clowes, SK, Debnath, M, et al , High-mobility thin InSb films grown by molecular beam epitaxy, APPL PHYS LETT, 2004, Vol: 84, Pages: 4463 - 4465, ISSN: 0003-6951
  • Branford, WR, Roy, SB, Clowes, SK, et al , Spin polarisation and anomalous Hall effect in NiMnSb films, J MAGN MAGN MATER, 2004, Vol: 272, Pages: E1399 - E1401, ISSN: 0304-8853
  • Bugoslavsky, Y, Miyoshi, Y, Perkins, GK, et al , Superconducting gap structure and pinning in disordered MgB2 films, SUPERCOND SCI TECH, 2004, Vol: 17, Pages: S350 - S354, ISSN: 0953-2048
  • Clowes, SK, Miyoshi, Y, Johannson, O, et al , Using PCAR to study Cu/Co bilayers, J MAGN MAGN MATER, 2004, Vol: 272, Pages: E1471 - E1473, ISSN: 0304-8853
  • Nurgaliev, T, Cohen, LF, Purnell, A, et al , Surface resistance measurements of HTS films placed inside a cavity with a puck resonator, PHYSICA C, 2004, Vol: 403, Pages: 276 - 282, ISSN: 0921-4534
  • Roy, SB, Perkins, GK, Chattopadhyay, MK, et al , First order magnetic transition in doped CeFe2 alloys: Phase coexistence and metastability, PHYS REV LETT, 2004, Vol: 92, ISSN: 0031-9007
  • Bugoslavsky, Y, Miyoshi, Y, Perkins, GK, et al , Effect of magnetic field on the two superconducting gaps in MgB2, PHYS REV B, 2004, Vol: 69, ISSN: 1098-0121
  • Purnell, AJ, Cohen, LF, Zhai, HY, et al , Nonlinear microwave response of an MgB2 thin film, SUPERCOND SCI TECH, 2004, Vol: 17, Pages: 681 - 684, ISSN: 0953-2048
  • Branford, WR, Clowes, SK, Syed, MH, et al , Large positive magnetoresistance in nonstoichiometric NiMnSb thin films on silicon, APPL PHYS LETT, 2004, Vol: 84, Pages: 2358 - 2360, ISSN: 0003-6951
  • Singh, LJ, Barber, ZH, Miyoshi, Y, et al , Structural, magnetic, and transport properties of thin films of the Heusler alloy Co2MnSi, APPL PHYS LETT, 2004, Vol: 84, Pages: 2367 - 2369, ISSN: 0003-6951
  • Etchegoin, P, Cohen, LF, Hartigan, H, et al , Localized plasmon resonances in inhomogeneous metallic nanoclusters, CHEM PHYS LETT, 2004, Vol: 383, Pages: 577 - 583, ISSN: 0009-2614
  • Caplin, AD, Bugoslavsky, Y, Cohen, LF, et al , The current-voltage relationship in crystals and conductors, PHYSICA C, 2004, Vol: 401, Pages: 1 - 6, ISSN: 0921-4534
  • Perkins, GK, Bugoslavsky, Y, Caplin, AD, et al , Effects of proton irradiation and ageing on the superconducting properties of single crystalline and polycrystalline MgB2, SUPERCOND SCI TECH, 2004, Vol: 17, Pages: 232 - 235, ISSN: 0953-2048
  • Zhang, T, Debnath, M, Clowes, SK, et al , InSb epilayers on GaAs(100) for spintronic and magneto-resistive sensor applications, PHYSICA E, 2004, Vol: 20, Pages: 216 - 219, ISSN: 1386-9477
  • Mironov, OA, Myronov, M, Durov, S, et al , The sub-micrometer thickness n-InSb/i-GaAs epilayers for magnetoresistor applications at room temperatures of operation, PHYSICA E, 2004, Vol: 20, Pages: 523 - 526, ISSN: 1386-9477
  • Branford,WR, Clowes, SK, Bugoslavsky, YL, et al , Thickness dependence of Hall transport in Ni1.15Mn0.85Sb thin films on silicon, Physical Review B, 2004, Vol: 69, Pages: 201305-1 - 201305-4, ISSN: 1098-0121


Recent Conference Contributions

  • Moore, JD, Perkins, GK, Branford, W, et al , The superconducting properties of co-doped polycrystalline MgB2, Conference on Flux Pinning and Other Related Phenomena in Type-II Superconductors, 2007, Pages: S278 - S281
  • Litvinenko, KL, Nikzad, L, Allam, J, et al , Spin dynamics in narrow-gap semiconductor epitaxial layers, 4th International School and Conference on Spintronics and Quantum Information Technology (Spintech IV), 2007, Pages: 461 - 465
  • Litvinenko, KL, Nikzad, L, Allam, J, et al , Spin lifetime in high quality InSb epitaxial layers grown on GaAs - art. no. 083105, 28th International Conference on the Physics of Semiconductors (ICPS-28), 2007, Pages: 83105 - 83105
  • Clowes, SK, Branford, WR, Gilbertson, AM, et al , Improved geometric control of the high-field linear magnetoresistance by metallic bridges in InSb arrays, 28th International Conference on the Physics of Semiconductors (ICPS-28), 2007, Pages: 1383 - 1384
  • Zhang, T, Harris, JJ, Branford, WR, et al , Inherent magnetoresistance and surface morphology of InSb thin films, 28th International Conference on the Physics of Semiconductors (ICPS-28), 2007, Pages: 561 - 562
  • Itskos, G, Harbord, E, Clowes, SK, et al , Oblique Hanle measurements of InAs/GaAs quantum dot spin-light emitting diodes, 28th International Conference on the Physics of Semiconductors (ICPS-28), 2007, Pages: 1289 - 1290
  • Magnus, F, Burnell, G, Miyoshi, Y, et al , Planar Andreev spectroscopy in InAs, 28th International Conference on the Physics of Semiconductors (ICPS-28), 2007, Pages: 1281 - 1282
  • Popovici, N, Jimenez, E, da Silva, RC, et al , Optical and magnetic properties of Co-doped TiO2 thin films grown by pulsed laser deposition, 21st International Conference on Amorphous and Nanocrystalline Semiconductors, 2006, Pages: 1486 - 1489
  • polyfluorene copolymers - art. no. 633314, Conference on Organic Light Emitting Materials and Devices X, 2006, Pages: 33314 - 33314
  • Manoharan, SS, Singh, B, Driscoll, J, et al , Magnetism and mectronic transport in Sr4-xLaxRu2-xMnxO9: Interplay of Mn and Ru redox chemistry - art. no. 10A304, 49th Annual Conference on Magnetism and Magnetic Materials, 2005, Pages: A304 - A304
  • Bugoslavsky,Y., Schusteritsch,G., Polichetti,M., et al , AC losses in BiSCCO/Ag multifilamentary tapes: effects of simultaneous ac transport current and ac magnetic field, Applied superconductivity 2003: proceedings of the sixth European conference on applied superconductivity, Sorrento, Italy, 14 - 18 September 2003, In: Andreone,A., Pepe,G.P., Cristiano,R., Masullo,G., editor, Bristol, Institute of Physics Publishing, 2004
  • Perkins,G.K., Caplin,A.D., Cohen,L.F., Dynamic Interactions between pancale stacks and Josephson vortices, Applied superconductivity 2003: proceedings of the sixth European conference on applied superconductivity, Sorrento, Italy, 14 - 18 September 2003, In: Andreone,A., Pepe,G.P., Cristiano,R., Masullo,G., editor, Bristol, Institute of Physics Publishing, 2004
  • Purnell,A.J., Cohen,L.F., Failure analysis of superconducting thin films at high microwave power using microsecond time domain measurements, Applied superconductivity 2003: proceedings of the sixth European conference on applied superconductivity, Sorrento, Italy, 14 - 18 September 2003, In: Andreone,A., Pepe,G.P., Cristiano,R., Masullo,G., editor, Bristol, Institute of Physics Publishing, 2004
  • Zhang, T, Debnath, M, Clowes, SK, et al , InSb epilayers on GaAs(100) for spintronic and magneto-resistive sensor applications, 11th International Conference on Narrow Gap Semiconductors, 2004, Pages: 216 - 219
  • Moore,D., Bugoslavsky,Y., Cohen,L.F., Magnetisation studies of proton irradiation and aging effects in single crystal and oolycrystalline MgB2, Applied superconductivity 2003: proceedings of the sixth European conference on applied superconductivity, Sorrento, Italy, 14 - 18 September 2003, In: Andreone,A., Pepe,G.P., Cristiano,R., Masullo,G., editor, Bristol, Institute of Physics Publishing, 2004
  • Lamura,G., Andreone,A., Purnell,A.J., et al , Nonlinear microwave properties of MgB2 thin films: intermodulation distortion, Applied superconductivity 2003: proceedings of the sixth European conference on applied superconductivity, Sorrento, Italy, 14 - 18 September 2003, In: Andreone,A., Pepe,G.P., Cristiano,R., Masullo,G., editor, Bristol, Institute of Physics Publishing, 2004
  • Branford,W.R., Roy,S.B., Clowes,S.K., et al , Spin plarisation and anomolous hall effect in NiMnSb, Proceedings of the international conference on magnetism (ICM 2003), Rome, 27 July - 1 August 2003, In: Fiorani,D., Pareti,L., editor, Elsevier, 2004
  • Mironov, OA, Myronov, M, Durov, S, et al , The sub-micrometer thickness n-InSb/i-GaAs epilayers for magnetoresistor applications at room temperatures of operation, 11th International Conference on Narrow Gap Semiconductors, 2004, Pages: 523 - 526
  • Clowes,S.K., Miyoshi,Y., Johannson,O., et al , Using point contact Andreev reflection to study Cu/Co bilayers, Proceedings of the international conference on magnetism (ICM 2003), Rome, 27 July - 1 August 2003, In: Fiorani,D., Pareti,L., editor, Elsevier, 2004

Patents

  • Tong Z, Roberts C, Cohen L, A novel growth method for high-mobility InSb epilayers on GaAs(100), GB 326731.1


 

Research Highlights

Monopole defects and magnetic Coulomb blockade Ladak et al., New Journal of Physics 2011,Magnetic monopoles, predicted by...
Researchers from the London Centre for Nanotechnology at Imperial College report the magnetic field detection...
Funding: 

EPSRC

  • Platform Grant – Functional Magnetism, 60 months, 2007 -2011, 850K
  • Royal Society
  • International Research Grant Scheme, 36 months, 2006 -2009,15K Other grant holder- Prof Roy, Indore, India
  • EPSRC -C511972 C511980 C511999 C512006
  • Materials Engineering to Optimise the Spin 36months, 2005 – 2008, 1,025K Other grant holder- Cambridge(Barber),
  • Dependent Transport between Ferromagnetic, Other grant holder- Surrey (Murdin)
  • Metals and Narrow Gap Semiconductors, 610K for Imperial

EPSRC- GR/T03802

  • Spatially resolved spin polarisation spectroscopy for improved characterisation of spintronic materials, 36 months, 2005-2008, 257K, Other grant holder- (Blamire) Cambridge

CEC NMP3

  • HYPERMAG- CT 2004-505724, 36months, 2005-2008, 107K Large EU grant with several other partners
  • Leverhulme- F/07 058/V
  • Realisation of time asymmetric superconducting flux devices,36 months, 2004 – 2008, 269K, Other grant holder- Perkins & Caplin

EPSRC- EP/C511816

  • Processing and Properties of Nanoscopic Extraordinary Magnetoresistance Devices Based on High Mobility Ultra thin films Semiconductors, 3months, 2005 -2007, 30K

EPSRC- GR/T06124

  • Understanding and Utility of Surface Enhanced Raman Scattering, 3months, 2005 – 2008, 25K, Other grant holder- Bradley, Leatherbarrow

EPSRC

  • MgB2, 2004-2007, 200K, Other grant holder- Cofunded with Driscoll - Cambridge University
  • Mitel student sponsorship EFM for semiconductor characterisation -Ryan Fergason
  • NPL sponsorship Microwave investigation into manganites – Karen Yates
  • NPL sponsorship Microwave investigation into power handling of HTS – Adrian Purnell
  • NPL sponsorship AFM and MFM studies of manganites – Phil Hudson
  • NPL sponsorship for Robert Maher SERS 2001-200
  • NPL Sp onsorship for Hai Liem SERS 2001-2002
  • NPL Sponsorship for Yasayuki Miyoshi Spintronics 2002 –2005
  • NPL sponsorship for Robert Maher SERS 2003-2006
  • QinetiQ CASE Award Adam Gilbertson 2005 -2008
  • NPL Sponsorship Fred Magnus 2005 - 2007
  • In addition links or collaboration with GEC, NEC. MMC, Seagate, Emcore, Renishaw, QinetiQ.
Teaching: 
  • Postgraduate Courses / Modules
  • Other, Director of Post Graduate Studies
  • Lecturer, Research Interfaces
  • Undergraduate Courses / Modules
  • Organiser, Professional Skills year 2 and 3