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

Recent discovery of two-dimensional 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, we systematically investigated the anomalous Hall and Nernst effects to uncover significant spin-conversion effects in above-room-temperature van der Waals ferromagnet FeGaTe with perpendicular magnetic anisotropy. The anomalous Hall effect demonstrated an efficient electric spin-charge conversion with a notable spin Hall angle 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 and a Nernst angle of approximately 62%. Such innovative thermoelectric signal arises from the efficient thermo-spin conversion effect, where the up-spin and down-spin electrons move in the 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. This article is protected by copyright. All rights reserved.