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Inverse Orbital Torque via Spin-Orbital Intertwined States

E. Santos1, J.E. Abrão1, Dongwook Go2,3, L.K. de Assis4, Yuriy Mokrousov2,3, J.B.S. Mendes5, and A. Azevedo1,*

  • 1Departamento de Física, Universidade Federal de Pernambuco, Recife, Pernambuco 50670-901, Brazil
  • 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
  • 3Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
  • 4Universidade Federal de Pernambuco, Programa de Pós-Graduação em Ciências dos Materiais, Recife, Pernambuco 50740-560, Brazil
  • 5Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, Minas Gerais, Brazil

  • *antonio.azevedo@ufpe.br
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Phys. Rev. Applied 19, 014069 – Published 27 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014069

Abstract

While current-induced torque by orbital current has been experimentally found in various structures, evidence for its reciprocity has been missing so far. Here, we report experimental evidence of strong inverse orbital torque in YIG/Pt/CuOx (YIG=Y3Fe5O12) mediated by spin-orbital mixed electronic states in Pt. By injecting spin current from YIG to Pt by the spin pumping via ferromagnetic resonance and by the spin Seebeck effect, we find a pronounced inverse spin Hall effectlike signal. While a part of the signal is explained as being due to the inverse spin-orbital Hall effect in Pt, we also find a substantial increase of the signal in YIG/Pt/CuOx structures compared to the signal in YIG/Pt. We attribute this to the inverse orbital Rashba-Edelstein effect at the Pt/CuOx interface mediated by the spin-orbital coupled states in Pt. Our work paves the way toward understanding of spin-orbital intertwined physics in nonequilibrium and provides a way for electrical detection of the orbital current in orbitronic device applications.

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Phys. Rev. Applied 19, 014069– Published 27 January, 2023
  • Received 5 April 2022
  • Revised 3 October 2022
  • Accepted 20 December 2022
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