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Minimal Model of Spin-Transfer Torque and Spin Pumping caused by Spin Hall Effect

arXiv.org, Nov 22, 2015 [Peer Reviewed Journal]

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  • Title:
    Minimal Model of Spin-Transfer Torque and Spin Pumping caused by Spin Hall Effect
  • Author: Chen, Wei ; Sigrist, Manfred ; Sinova, Jairo ; Manske, Dirk
  • Contributor: Manske, Dirk (pacrepositoryorg)
  • Found In: arXiv.org, Nov 22, 2015 [Peer Reviewed Journal]
  • Subjects: Electromagnetism ; Ejection ; Torque ; Material Properties ; Iron ; Yttrium ; Damping ; Cobalt ; Pumping ; Hall Effect ; Quantum Tunnelling ; Ferromagnetism ; Thickness ; Platinum
  • Language: English
  • Description: In the normal metal/ferromagnetic insulator bilayer (such as Pt/Y\(_{3}\)Fe\(_{5}\)O\(_{12}\)) and the normal metal/ferromagnetic metal/oxide trilayer (such as Pt/Co/AlO\(_{x}\)) where spin injection and ejection are achieved by the spin Hall effect in the normal metal, we propose a minimal model based on quantum tunneling of spins to explain the spin-transfer torque and spin pumping caused by the spin Hall effect. The ratio of their damping-like to field-like component depends on the tunneling wave function that is strongly influenced by generic material properties such as interface \(s-d\) coupling, insulating gap, and layer thickness, yet the spin relaxation plays a minor role. The quantified result renders our minimal model an inexpensive tool for searching for appropriate materials.
  • Identifier: DOI: 10.1103/PhysRevLett.115.217203

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