Interlayer Couplings Mediated by Antiferromagnetic Magnons

Abstract

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. 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 $10-100$ $\mu$eV for nanoscale separations, allowing experimental verification.

arXiv commentPhysical Review Letters 121, 207202 (2018)

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• Observation of the thermal Casimir force
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Cited by in corpus (10)

• Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO
• Coherent ac spin current transmission across an antiferromagnetic CoO insulator
• Excitation of magnon spin photocurrents in antiferromagnetic insulators
• Magnonic Casimir Effect in Ferrimagnets
• Cavity magnonics with easy-axis ferromagnet: Critically enhanced magnon squeezing and light-matter interaction
• Magnon-mediated interlayer coupling in an all-antiferromagnetic junction
• Exotic magnetic field-induced spin-superstructures in a mixed honeycomb triangular lattice system
• Thermal gating of magnon exchange in magnetic multilayers with antiferromagnetic spacers
• Non-Hermitian Casimir effect of magnons
• Entropic magnetic interlayer coupling