Magnetic hysteresis of an artificial square ice studied by in-plane Bragg xray resonant magnetic scattering

Morgan, J P, Kinane, C J, Charlton, T R, Stein, A, Sanchez-Hanke, C, Arena, D A, Langridge, S and Marrows, C H 2012. Magnetic hysteresis of an artificial square ice studied by in-plane Bragg xray resonant magnetic scattering. AIP Advances 2 (2) , 022163. 10.1063/1.4732147

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Abstract

We report X-ray resonant magnetic scattering studies of a Permalloy artificial square ice nanomagnet array, focussing on the field-driven evolution of the sum σ and difference δ signals of left and right handed circularly polarized synchrotron X-rays at different lateral positions in reciprocal space Qx. We used X-rays tuned to the Fe L3 resonance energy, with the scattering plane aligned along a principal symmetry axis of the array. Details of the specular δ hysteresis curve are discussed, following the system magnetization from an initial demagnetized state. The periodic structure gives rise to distinct peaks at in-plane reciprocal Bragg positions, as shown by fitting σ(Qx) to a model based on a simple unit cell structure. Diffraction orderdependent hysteresis in δ is observed, indicative of the reordering of magnetization on the system's two interpenetrating sublattices, which markedly deviates from an ideal Ising picture under strong applied fields.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Publisher:	American Institute of Physics
ISSN:	2158-3226
Date of Acceptance:	8 June 2012
Last Modified:	25 May 2023 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/157996

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