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CMP
Credit: Jack Hobhouse

Roger Ward

Retiree

Sub department

  • Condensed Matter Physics
Roger.Ward@physics.ox.ac.uk
Telephone: 01865 (2)72271,01865 (2)72355
Clarendon Laboratory, room 164
  • About
  • Publications

Molecular beam epitaxy growth of exchange-biased PtMn/NiFe bilayers with a spontaneously ordered PtMn layer

Journal of Applied Physics 99 (2006) 083903 6pp

Authors:

RC Ward, Y.S. Choi, J.P. Goff, T.P.A. Hase
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Self-organization of nanoneedles in Fe∕GaAs (001) epitaxial thin film

Applied Physics Letters AIP Publishing 88:10 (2006) 103104

Authors:

YZ Huang, SG Wang, C Wang, ZB Xie, DJH Cockayne, RCC Ward
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Growth and properties of epitaxial PtMn/NiFe bilayers on Si (001) substrate containing directly deposited ordered PtMn

Thin Solid Films Elsevier 489:1-2 (2005) 186-191

Authors:

Young-suk Choi, Amanda K Petford-Long, Roger CC Ward
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Magnetization process in holmium: easy axis spin reorientation induced by the magnetostrictive basal plane distortion.

Physical review letters 94:22 (2005) 227204

Authors:

L Benito, M Ciria, C de la Fuente, JI Arnaudas, RCC Ward, MR Wells

Abstract:

We report on the change of the easy axis direction in holmium, from the a to the b axis, under the application of a magnetic field in the basal plane. This spin reorientation is observed by measuring the magnetic torque in Ho(n)/Lu(15) superlattices (n and 15 are the number of atomic planes in the Ho and Lu blocks). We also observe that, at the field H0 and temperature at which the reorientation occurs, both axes are easy directions. Based on the fact that the field H0 depends on n in the same way as the field-induced magnetoelastic distortion does, we propose that this spin reorientation originates from the strong field-induced magnetoelastic deformation within the basal plane. The modulation of the alpha strains with sixfold symmetry originates a 12-fold term in the magnetic anisotropy energy.
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Propagation of magnetic and superconducting order in Gd/La superlattices

Journal of Physics: Condensed Matter 17 (2005) 3305-3315

Authors:

RC Ward, P.P. Deen, J.P. Goff, S. Langridge
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