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CMP
Credit: Jack Hobhouse

Professor John Gregg

Fellow & Tutor in Physics

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Spintronics
John.Gregg@physics.ox.ac.uk
  • About
  • Research
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  • Publications

MAGNETIC-INTERACTIONS IN GIANT MAGNETORESISTIVE CO-AG HETEROGENEOUS FILMS

IEEE T MAGN 30:2 (1994) 726-728

Authors:

SM THOMPSON, JF GREGG, SJ DAWSON, CR STADDON, K OUNADJELA, J HAMMANN, C FERMON
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Magnetoresistance in nanostructured Co-Ag prepared by mechanical-alloying

IEEE Transactions on Magnetics Institute of Electrical and Electronics Engineers (IEEE) 30:2 (1994) 666-668

Authors:

JMD Coey, AJ Fagan, R Skomski, J Gregg, K Ounadjela, SM Thompson
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Effect of magnetic interactions and multiple magnetic phases on the giant magnetoresistance of heterogeneous cobalt-silver thin films

Physical Review B 49:2 (1994) 1064-1072

Authors:

JF Gregg, SM Thompson, SJ Dawson, K Ounadjela, CR Staddon, J Hamman, C Fermon, G Saux, K O'Grady

Abstract:

We have observed magnetic and electrical transport properties in giant magnetoresistive inhomogeneous cobalt-silver films. The material consists of two distinct magnetic phases: large clusters which dominate the magnetization and magnetoresistive processes at room temperature, between which cooperative behavior is observed; and small clusters which dominate the magnetization below 10 K, but make only a minor contribution to the magnetoresistance. Both the variation of the magnetoresistance with magnetization in the film and the difference in the magnetoresistance between the zero-field-cooled and field-cycled state are interpreted by invoking interactions between the active magnetic regions in the sample. © 1994 The American Physical Society.
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Effects of annealing on microstructure of Co-Ag granular alloy films

(1994) 1171-1172

Authors:

AK PETFORDLONG, RC DOOLE, JF GREGG, CR STADDON
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GIANT MAGNETORESISTANCE OF COBALT SILVER METASTABLE ALLOYS PREPARED BY SPUTTERING AND MECHANICAL ALLOYING

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES 68:6 (1993) 923-937

Authors:

SM THOMPSON, JF GREGG, CR STADDON, D DANIEL, SJ DAWSON, K OUNADJELA, J HAMMANN, C FERMON, G SAUX, K OGRADY, SJ GRIEVES, JMD COEY, A FAGAN
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