Thermal Spin Torque in Double-Barrier Tunnel Junctions with Magnetic Insulators

Christian Ortiz Pauyac, Collins Ashu Akosa*, Gen Tatara, Mairbek Chshiev, Alan Kalitsov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The thermal spin torque induced by the spin-dependent Seebeck effect in double-barrier tunnel junctions is derived considering free-electron and tight-binding calculations. We show that in systems comprising ferromagnetic electrodes and nonmagnetic barriers, the in-plane component of the thermal spin torque is the dominant term, whereas in junctions comprising nonmagnetic electrodes and ferromagnetic barriers, both components, the in-plane and the out-of-plane, are comparable in magnitude. Moreover, larger torque amplitudes up to 3 orders of magnitude are obtained in the second system as a result of the spin-filtering effect; consequently, double-barrier tunnel junctions in the presence of magnetic insulators offer an enhanced thermal spin-torque mechanism for reliable applications. We propose taking advantage of quantum resonant tunneling through resonance states below the Fermi level in these structures that can pave a route toward achieving larger spin-torque efficiencies, even when considering smaller values of the exchange splitting. Furthermore, we identify the parameters needed to tune efficiently these resonant states.

Original languageEnglish
Article number064003
JournalPhysical Review Applied
Volume15
Issue number6
DOIs
Publication statusPublished - 2021 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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