Interlayer Couplings Mediated by Antiferromagnetic Magnons

Cheng, Ran; Xiao, Di; Zhu, Jian-Gang

doi:10.1103/physrevlett.121.207202

Title: Interlayer Couplings Mediated by Antiferromagnetic Magnons

Journal Article · Fri Nov 16 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.121.207202· OSTI ID:1611831

Cheng, Ran ^[1]; Xiao, Di ^[2]; Zhu, Jian-Gang ^[2]

Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of California, Riverside, CA (United States)
Carnegie Mellon Univ., Pittsburgh, PA (United States)

Collinear antiferromagnets (AFs) support two degenerate magnon excitations carrying opposite spin polarizations, by which magnons can function as electrons in various spin-related phenomena. In an insulating ferromagnet(F)/AF/F trilayer, we explore the magnon-mediated interlayer coupling by calculating the magnon thermal energy in the AF as a function of the orientations of the Fs. Furthermore, the effect manifests as an interlayer exchange interaction and a perpendicular magnetic anisotropy; they both depend on temperature and the AF thickness. In particular, the exchange interaction turns out to be antiferromagnetic at low temperatures and ferromagnetic at high temperatures, whose magnitude can be 10–100 μeV for nanoscale separations, allowing experimental verification.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012509

OSTI ID:: 1611831

Alternate ID(s):: OSTI ID: 1482417

Journal Information:: Physical Review Letters, Vol. 121, Issue 20; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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