Efficient thermo-spin conversion in van der Waals ferromagnet FeGaTe

TL;DR

This study demonstrates highly efficient thermo-spin conversion in the 2D van der Waals ferromagnet FeGaTe, revealing large spin polarization and promising applications in spintronic devices.

Contribution

It provides the first systematic investigation of anomalous Hall and Nernst effects in FeGaTe, achieving record-high thermo-spin polarization at room temperature.

Findings

Spin Hall angle of 6% - 10.38% indicating efficient spin-charge conversion

Thermo-spin polarization exceeds 690% at room temperature

Large thermo-spin polarization of 4690% at 93 K

Abstract

Recent discovery of 2D van der Waals (vdW) 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. We systematically investigated the anomalous Hall effect and anomalous Nernst effect in above-room-temperature van der Waals ferromagnet FeGaTe with perpendicular anisotropy, uncovering significant spin-conversion effects. The anomalous Hall effect demonstrated an efficient electric spin-charge conversion, with a notable spin Hall angle of 6 $\%$ - 10.38 $\%$. The temperature-dependent behavior of the anomalous Nernst voltage primarily results from the thermo-spin conversion. Uniquely, we have experimentally achieved thermo-spin polarization values of over 690 $\%$ at room temperature and extremely large of 4690 $\%$ at about 93 K. This study illuminates the potential of vdW ferromagnets in advancing efficient spin conversion devices.