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Cited 7 time in webofscience Cited 8 time in scopus
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Interface morphology effect on the spin mixing conductance of Pt/Fe3O4 bilayersopen access

Authors
Thi Kim Hang PhamRibeiro, MarioPark, Jun HongLee, Nyun JongKang, Ki HoonPark, EunsangVan Quang NguyenMichel, AnnyYoon, Chong SeungCho, SunglaeKim, Tae Hee
Issue Date
Sep-2018
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.8
Indexed
SCIE
SCOPUS
Journal Title
SCIENTIFIC REPORTS
Volume
8
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16129
DOI
10.1038/s41598-018-31915-3
ISSN
2045-2322
Abstract
Non-magnetic (NM) metals with strong spin-orbit coupling have been recently explored as a probe of interface magnetism on ferromagnetic insulators (FMI) by means of the spin Hall magnetoresistance (SMR) effect. In NM/FMI heterostructures, increasing the spin mixing conductance (SMC) at the interface comes as an important step towards devices with maximized SMR. Here we report on the study of SMR in Pt/Fe3O4 bilayers at cryogenic temperature, and identify a strong dependence of the determined real part of the complex SMC on the interface roughness. We tune the roughness of the Pt/Fe3O4 interface by controlling the growth conditions of the Fe3O4 films, namely by varying the thickness, growth technique, and post-annealing processes. Field-dependent and angular-dependent magnetoresistance measurements sustain the clear observation of SMR. The determined real part of the complex SMC of the Pt/Fe3O4 bilayers ranges from 4.96 x 10(14) Omega(-1) m(-2) to 7.16 x 10(14) Omega(-1) m(-2) and increases with the roughness of the Fe3O4 underlayer. We demonstrate experimentally that the interface morphology, acting as an effective interlayer potential, leads to an enhancement of the spin mixing conductance.
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