Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers

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Uittreksel

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.

Originele taal-2Engels
Artikelnummer232405
Aantal pagina's4
TijdschriftApplied Physics Letters
Volume111
Nummer van het tijdschrift23
DOI's
StatusGepubliceerd - 4 dec 2017

Vingerafdruk

diffusion theory
heavy metals
ambiguity
Hall effect
harmonics
electrical resistivity
room temperature
metals

Citeer dit

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title = "Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers",
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.",
author = "Y. Yin and D.S. Han and {de Jong}, M.C.H. and R. Lavrijsen and R.A. Duine and H.J.M. Swagten and B. Koopmans",
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Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers. / Yin, Y.; Han, D.S.; de Jong, M.C.H.; Lavrijsen, R.; Duine, R.A.; Swagten, H.J.M.; Koopmans, B.

In: Applied Physics Letters, Vol. 111, Nr. 23, 232405, 04.12.2017.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Thickness dependence of unidirectional spin-Hall magnetoresistance in metallic bilayers

AU - Yin, Y.

AU - Han, D.S.

AU - de Jong, M.C.H.

AU - Lavrijsen, R.

AU - Duine, R.A.

AU - Swagten, H.J.M.

AU - Koopmans, B.

PY - 2017/12/4

Y1 - 2017/12/4

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AB - 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.

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