Interface Transparency and Rashba Spin Torque Enhancement in WSe2Heterostructures

Steve Novakov, Bhakti Jariwala, Nguyen M. Vu, Azimkhan Kozhakhmetov, Joshua A. Robinson, John T. Heron

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Rashba spin current generation emerges in heterostructures of ferromagnets and transition metal dichalcogenides (TMDs) due to an interface polarization and associated inversion symmetry breaking. Recent work exploring the synthesis and transfer of epitaxial films on the top of low layer count 2D materials reveals that atomic potentials from the underlying substrate interface are not completely screened. The extension of this transparency effect to other interfacial phenomena, such as the Rashba effect and associated spin torques, has not yet been demonstrated. Here, we report enhanced spin transfer torques from the Rashba spin current in heterostructures of permalloy (Py) and WSe2. We show that insertion of up to two monolayers of WSe2 enhances the spin transfer torques in a Rashba system by up to 3×, without changing the fieldlike Rashba spin-orbit torque (SOT), a measure of interface polarization. Our results indicate that low layer count TMD films can be used as an interfacial "scattering promoter"in heterostructure interfaces without quenching the original polarization.

Original languageEnglish (US)
Pages (from-to)13744-13750
Number of pages7
JournalACS Applied Materials and Interfaces
Volume13
Issue number11
DOIs
StatePublished - Mar 24 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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