Giant magneto-spin-Seebeck effect and magnon transfer torques in insulating spin valves

Yihong Cheng, Kai Chen, Shufeng Zhang

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We theoretically study magnon transport in an insulating spin valve (ISV) made of an antiferromagnetic insulator sandwiched between two ferromagnetic insulator (FI) layers. In the conventional metal-based spin valve, the electron spins propagate between two metallic ferromagnetic layers, giving rise to giant magnetoresistance and spin transfer torque. Here, the incoherent magnons in the ISV serve as angular momentum carriers and are responsible for the angular momentum transport between two FI layers across the antiferromagnetic spacer. We predict two transport phenomena in the presence of the temperature gradient: a giant magneto-spin-Seebeck effect in which the output voltage signal is controlled by the relative orientation of the two FI layers and magnon transfer torque that can be used for switching the magnetization of the FI layers with a temperature gradient of the order of 0.1 Kelvin per nanometer.

Original languageEnglish (US)
Article number052405
JournalApplied Physics Letters
Volume112
Issue number5
DOIs
StatePublished - Jan 29 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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