Fabrication of yttrium-iron-garnet/Pt multilayers for the longitudinal spin Seebeck effect

Tatsuhiro Nozue, Takashi Kikkawa, Tomoki Watamura, Tomohiko Niizeki, Rafael Ramos, Eiji Saitoh, Hirohiko Murakami

研究成果: Article査読

9 被引用数 (Scopus)

抄録

For longitudinal spin Seebeck effect (LSSE) devices, a multilayer structure comprising ferromagnetic and nonmagnetic layers is expected to improve their thermoelectric power. In this study, we developed a fabrication method for alternately stacked yttrium-iron-garnet (YIG)/Pt multilayer films on a gadolinium gallium garnet (GGG) (110) substrate, GGG/[YIG(49 nm)/Pt(4 nm)] n (n = 1-5) based on room-temperature sputtering and ex-situ post-annealing methods and we evaluated their structural and LSSE properties. The fabricated [YIG/Pt] n samples show flat YIG/Pt interfaces and almost identical saturation magnetization M s although they contain polycrystalline YIG layers on Pt layers as well as single-crystalline YIG layers on GGG. In the samples, we observed clear LSSE signals and found that the LSSE thermoelectric power factor (PF) increases monotonically with increasing n; the PF of the [YIG/Pt] 5 sample is enhanced by a factor of ∼28 compared to that of [YIG/Pt] 1 . This work may provide a guideline for developing future multilayer-based LSSE devices.

本文言語English
論文番号262402
ジャーナルApplied Physics Letters
113
26
DOI
出版ステータスPublished - 2018 12月 24

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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