Roger Ward: Publications

Evidence for FeO formation at the Fe/MgO interface in epitaxial TMR structure by X-ray photoelectron spectroscopy

Journal of Magnetism and Magnetic Materials Elsevier 310:2 (2007) 1935-1936

Authors:

SG Wang, G Han, GH Yu, Y Jiang, C Wang, A Kohn, RCC Ward

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Thermal evolution of magnetic behavior in MBE-grown [50 Å ErFe₂/150 Å YFe₂]₂₀ superlattice

OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS 1:1 (2007) 5-7

Authors:

K Wang, KN Martin, CG Morrison, AR Buckingham, RCC Ward, GJ Bowden, PAJ De Groot

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Magnetization reversal in micron‐sized stripes of epitaxial (110) YFe2 films

physica status solidi (a) – applications and materials science Wiley 203:15 (2006) 3831-3835

Authors:

K Wang, KN Martin, CG Morrison, RCC Ward, GJ Bowden, PAJ de Groot

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Polarised neutron reflectivity from U/Fe, U/Gd multilayers

Physica B Condensed Matter Elsevier 385 (2006) 173-175

Authors:

R Springell, SW Zochowski, S Langridge, MF Thomas, F Wilhelm, A Rogalev, SD Brown, WG Stirling, GH Lander, RCC Ward, MR Wells

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Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

Applied Physics Letters AIP Publishing 89:13 (2006)

Authors:

KN Martin, K Wang, GJ Bowden, AA Zhukov, PAJ de Groot, JP Zimmermann, H Fangohr, RCC Ward

Abstract:

Magnetization loops for (110) ErFe2∕YFe2 multilayer films grown by molecular beam epitaxy are presented and discussed. The direction of easy magnetization for the Er layers is out of plane, near a ⟨111⟩-type crystal axis. For fields applied along the (110) crystal growth axis, out-of-plane magnetic exchange springs are set up in the magnetically soft YFe2 layers. For multilayer films that display negative coercivity at low temperatures, there is a crossover temperature above which the coercivity becomes positive, with additional transitions at high fields. These features are interpreted using micromagnetic modeling. At sufficiently high fields, applied perpendicular to the multilayer film plane, the energy is minimized by an exchange spring driven multilayer spin flop. In this state, the average magnetization of the ErFe2 layers switches into a nominally hard in-plane ⟨111⟩ axis, perpendicular to the applied field.

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Roger Ward

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Evidence for FeO formation at the Fe/MgO interface in epitaxial TMR structure by X-ray photoelectron spectroscopy

Authors:

Thermal evolution of magnetic behavior in MBE-grown [50 Å ErFe₂/150 Å YFe₂]₂₀ superlattice

Authors:

Magnetization reversal in micron‐sized stripes of epitaxial (110) YFe2 films

Authors:

Polarised neutron reflectivity from U/Fe, U/Gd multilayers

Authors:

Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

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Roger Ward

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Evidence for FeO formation at the Fe/MgO interface in epitaxial TMR structure by X-ray photoelectron spectroscopy

Authors:

Thermal evolution of magnetic behavior in MBE-grown [50 Å ErFe2/150 Å YFe2]20 superlattice

Authors:

Magnetization reversal in micron‐sized stripes of epitaxial (110) YFe2 films

Authors:

Polarised neutron reflectivity from U/Fe, U/Gd multilayers

Authors:

Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

Authors:

Abstract:

Thermal evolution of magnetic behavior in MBE-grown [50 Å ErFe₂/150 Å YFe₂]₂₀ superlattice