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Article Dans Une Revue Scientific Reports Année : 2018

Interface morphology effect on the spin mixing conductance of Pt/Fe3O4 bilayers

Thi Kim Hang Pham
  • Fonction : Auteur
Jun Hong Park
  • Fonction : Auteur
Nyun Jong Lee
  • Fonction : Auteur
Ki Hoon Kang
  • Fonction : Auteur
Eunsang Park
  • Fonction : Auteur
Chong Seung Yoon
  • Fonction : Auteur
Sunglae Cho
  • Fonction : Auteur
Tae Hee Kim
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-02295377 , version 1 (24-09-2019)

Identifiants

Citer

Thi Kim Hang Pham, Mário Ribeiro, Jun Hong Park, Nyun Jong Lee, Ki Hoon Kang, et al.. Interface morphology effect on the spin mixing conductance of Pt/Fe3O4 bilayers. Scientific Reports, 2018, 8 (1), ⟨10.1038/s41598-018-31915-3⟩. ⟨hal-02295377⟩
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