Efficient Thermo-Spin Conversion in van der Waals Ferromagnet FeGaTe.

Autor: Liu S; Department of Physics, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan., Hu S; Department of Physics, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan., Cui X; Department of Physics, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan., Kimura T; Department of Physics, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan.; Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Apr; Vol. 36 (14), pp. e2309776. Date of Electronic Publication: 2023 Dec 31.
DOI: 10.1002/adma.202309776
Abstrakt: Recent discovery of 2D van der Waals magnetic materials has spurred progress in developing advanced spintronic devices. A central challenge lies in enhancing the spin-conversion efficiency for building spin-logic or spin-memory devices. Here, the anomalous Hall and Nernst effects are systematically investigated to uncover significant spin-conversion effects in above-room-temperature van der Waals ferromagnet FeGaTe with perpendicular magnetic anisotropy. The anomalous Hall effect demonstrates an efficient electric spin-charge conversion with a notable spin Hall angle of over 6%. In addition, the anomalous Nernst effect produces a significant transverse voltage at room temperature without a magnetic field, displaying unique temperature dependence with a maximum transverse Seebeck coefficient of 440 nV K -1 and a Nernst angle of ≈62%. Such an innovative thermoelectric signal arises from the efficient thermo-spin conversion effect, where the up-spin and down-spin electrons move in opposite directions under a temperature gradient. The present study highlights the potential of FeGaTe to enhance thermoelectric devices through efficient thermo-spin conversion without the need for a magnetic field.
(© 2023 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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