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

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

*この研究の対応する著者

研究成果: Article査読

抄録

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.

本文言語English
論文番号064003
ジャーナルPhysical Review Applied
15
6
DOI
出版ステータスPublished - 2021 6
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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