Spin-Orbit Strength Driven Crossover between Intrinsic and Extrinsic Mechanisms of the Anomalous Hall Effect in the Epitaxial $L{1}_{0}$-Ordered Ferromagnets FePd and FePt

Spin-Orbit Strength Driven Crossover between Intrinsic and Extrinsic Mechanisms of the Anomalous Hall Effect in the Epitaxial $L 1_{0}$ -Ordered Ferromagnets FePd and FePt

K. M. Seemann, Y. Mokrousov, A. Aziz, J. Miguel, F. Kronast, W. Kuch, M. G. Blamire, A. T. Hindmarch, B. J. Hickey, I. Souza, and C. H. Marrows

Phys. Rev. Lett. 104, 076402 – Published 19 February 2010

Abstract

We determine the composition of intrinsic as well as extrinsic contributions to the anomalous Hall effect (AHE) in the isoelectronic $L 1_{0}$ FePd and FePt alloys. We show that the AHE signal in our 30 nm thick epitaxially deposited films of FePd is mainly due to an extrinsic side jump, while in the epitaxial FePt films of the same thickness and degree of order the intrinsic contribution is dominating over the extrinsic mechanisms of the AHE. We relate this crossover to the difference in spin-orbit strength of Pt and Pd atoms and suggest that this phenomenon can be used for tuning the origins of the AHE in complex alloys.

Received 4 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.076402

Authors & Affiliations

K. M. Seemann^1,*, Y. Mokrousov², A. Aziz³, J. Miguel⁴, F. Kronast⁵, W. Kuch⁴, M. G. Blamire³, A. T. Hindmarch¹, B. J. Hickey¹, I. Souza⁶, and C. H. Marrows^1,†

¹School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, United Kingdom
²Institut für Festkörperforschung and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
³Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
⁴Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, D-14195 Berlin, Germany
⁵Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin, Germany
⁶Department of Physics, University of California, Berkeley, California 94720, USA

^*Present address: Institut für Festkörperforschung (IFF-9), FZ Jülich GmbH, D-52425 Jülich, Germany. k.seemann@fz-juelich.de
^†c.h.marrows@leeds.ac.uk

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Vol. 104, Iss. 7 — 19 February 2010

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