Efficient spin-to-charge interconversion in Weyl semimetal TaP at room temperature

Abstract

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 $(Py=N{i}_{81}F{e}_{19})$. 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 ${\lambda }_{IREE}=(0.30\pm 0.01)$ 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.

15 pages, 4 figures

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• Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces
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Cited by in corpus (1)

• Probing the Spin-Momentum Locking in Rashba Surfaces via Spin Current