Interface morphology effect on the spin mixing conductance of Pt/Fe3 O4 bilayers

Scientific Reports
Thi Kim Hang PhamTae Hee Kim

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 × 1014 Ω-1 m-2 to 7.16 × 1014 Ω-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.

References

Oct 10, 2008·Nature·K UchidaE Saitoh
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Apr 24, 2012·Nature Materials·Tomas JungwirthKamil Olejník
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Dec 21, 2017·Nature Communications·Mário RibeiroFèlix Casanova

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Citations

Sep 7, 2019·Physical Review Letters·Lijun ZhuRobert A Buhrman
Jan 25, 2020·Physical Review Letters·Avirup DeSunil Nair
Nov 27, 2021·Nanoscale·K SriramChandrasekhar Murapaka

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Methods Mentioned

BETA
atomic force microscopy
AFM
Optical microscopy
electron diffraction
X-ray

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