Spin-orbit interaction enhancement in permalloy thin films by Pt doping

Hrabec, A., Gonçalves, F.J.T., Spencer, C.S., Arenholz, E., N'Diaye, A.T., Stamps, R.L. and Marrows, C. H. (2016) Spin-orbit interaction enhancement in permalloy thin films by Pt doping. Physical Review B, 93(1), 014432. (doi:10.1103/PhysRevB.93.014432)

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Abstract

The spin-orbit interaction is an inherent part of magnetism, which links up the independent world of spins to the atomic lattice, thus controlling many functional properties of magnetic materials. In the widely used 3d transition metal ferromagnetic films, the spin-orbit interaction is relatively weak, due to low atomic number. Here we show that it is possible to enhance and tune the spin-orbit interaction by adding 5d platinum dopants into permalloy (Ni81Fe19) thin films by a cosputtering technique. This is achieved without significant changes of the magnetic properties, due to the vicinity of Pt to meeting the Stoner criterion for the ferromagnetic state. The spin-orbit interaction is investigated by means of transport measurements (the anisotropic magnetoresistance and anomalous Hall effect), ferromagnetic resonance measurements to determine the Gilbert damping, as well as by measuring the x-ray magnetic circular dichroism at the L3 and L2 x-ray absorption edges to reveal the ratio of orbital to spin magnetic moments. It is shown that the effective spin-orbit interaction increases with Pt concentration within the 0%–10% Pt concentration range in a way that is consistent with theoretical expectations for all four measurements.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stamps, Professor Robert and Hrabec, Dr Ales
Authors: Hrabec, A., Gonçalves, F.J.T., Spencer, C.S., Arenholz, E., N'Diaye, A.T., Stamps, R.L., and Marrows, C. H.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):2469-9969
Copyright Holders:Copyright © 2016 American Physical Society
First Published:First published in Physical Review B 93(1): 014432
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
683531Consortium for advanced materials based on spin chiralityRobert StampsEngineering & Physical Sciences Research Council (EPSRC)EP/M024423/1S&E P&A - PHYSICS & ASTRONOMY
547981Current-Driven Domain Wall Motion in Multilayer NanowiresStephen McVitieEngineering & Physical Sciences Research Council (EPSRC)EP/I013520/1P&A - PHYSICS & ASTRONOMY