Interface morphology effect on the spin mixing conductance of Pt/Fe3O4 bilayers
- 주제(기타) Multidisciplinary Sciences
- 설명문(일반) [Thi Kim Hang Pham; Ribeiro, Mario; Park, Jun Hong; Kim, Tae Hee] Ewha Womans Univ, Inst Basic Sci, Ctr Quantum Nanosci, Seoul 03760, South Korea; [Thi Kim Hang Pham; Ribeiro, Mario; Park, Jun Hong; Kim, Tae Hee] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Lee, Nyun Jong] Korea Basic Sci Inst, Div Sci Instrumentat, Spin Engn Phys Team, Daejeon 34133, South Korea; [Kang, Ki Hoon; Yoon, Chong Seung] Hanyang Univ, Div Mat Sci & Engn, Seoul 04763, South Korea; [Park, Eunsang] Korea Univ, KU KIST Grad Sch Converging Sci & Technol, Seoul 02841, South Korea; [Van Quang Nguyen; Cho, Sunglae] Univ Ulsan, Dept Phys, Ulsan 44610, South Korea; [Van Quang Nguyen; Cho, Sunglae] Univ Ulsan, Energy Harvest Storage Res Ctr, Ulsan 44610, South Korea; [Michel, Anny] Univ Poitiers, ENSMA, Dept Phys & Mecan Mat, Inst Pprime,UPR 3346,CNRS, Poitiers, France
- 등재 SCIE, SCOPUS
- 발행기관 NATURE PUBLISHING GROUP
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000156147
- 본문언어 영어
- Published As http://dx.doi.org/10.1038/s41598-018-31915-3
초록/요약
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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