Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers

Title
Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers
Authors
한동수Yuxiang YinMark CH de JongReinoud LavrijsenRembert A DuineHenk JM SwagtenBert Koopmans
Issue Date
2017-12
Publisher
Applied physics letters
Citation
VOL 111, NO 23, 232405
Abstract
A nonlinear magnetoresistance-called unidirectional spin-Hall magnetoresistance-is recently experimentally discovered in metallic bilayers consisting of a heavy metal and a ferromagnetic metal. To study the fundamental mechanism of unidirectional spin-Hall magnetoresistance (USMR), both ferromagnetic and heavy metallic layer thickness dependence of the USMR are presented in a Pt/Co/AlOx trilayer at room temperature. To avoid ambiguities, second harmonic Hall measurements are used for separating spin-Hall and thermal contributions to the non-linear magnetoresistance. The experimental results are fitted by using a drift-diffusion theory, with parameters extracted from an analysis of longitudinal resistivity of the Co layer within the framework of the Fuchs-Sondheimer model. A good agreement with the theory is found, demonstrating that the USMR is governed by both the spin-Hall effect in the heavy metallic layer and the metallic diffusion process in the ferromagnetic layer. Published by AIP Publishing.
URI
http://pubs.kist.re.kr/handle/201004/70761
ISSN
0003-6951
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