In this paper we present spin-to-charge current conversion properties in the Weyl semimetal TaP by means of the inverse Rashba-Edelstein effect (IREE) with the integration of this quantum material with the ferromagnetic metal Permalloy (Py=Ni81Fe19). The spin currents are generated in the Py layer by the spin pumping effect (SPE) from microwave-driven ferromagnetic resonance and are detected by a dc voltage along the TaP crystal, at room temperature. We observe a field-symmetric voltage signal without the contamination of asymmetrical lines due to spin rectification effects observed in studies using metallic ferromagnets. The observed voltage is attributed to spin-to-charge current conversion based on the IREE, made possible by the spin-orbit coupling induced intrinsically by the bulk band structure of Weyl semimetals. The measured IREE coefficient λIREE=(0.30±0.01) nm is two orders of magnitude larger than in graphene and is comparable to or larger than the values reported for some metallic interfaces and for several topological insulators.
Cite
@article{arxiv.2208.05151,
title = {Efficient spin-to-charge interconversion in Weyl semimetal TaP at room temperature},
author = {J. B. S. Mendes and R. O. Cunha and S. O. Ferreira and R. D. dos Reis and M. Schmidt and M. Nicklas and S. M. Rezende and A. Azevedo},
journal= {arXiv preprint arXiv:2208.05151},
year = {2023}
}