Fabrication of yttrium–iron–garnet/Pt multilayers for the longitudinal spin Seebeck effect
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 g...
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Veröffentlicht in: | Applied physics letters 2018-12, Vol.113 (26) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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
Ms 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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.5046977 |