Self-Hybridization and Tunable Magnon-Magnon Coupling in van der Waals Synthetic Magnets

Joseph Sklenar and Wei Zhang
Phys. Rev. Applied 15, 044008 – Published 5 April 2021

Abstract

Van der Waals magnets are uniquely positioned at the intersection between two-dimensional materials, antiferromagnetic spintronics, and magnonics. The interlayer exchange interaction in these materials enables antiferromagnetic resonances to be accessed at gigahertz frequencies. Consequently, these layered antiferromagnets are intriguing materials out of which quantum hybrid magnonic devices can be fashioned. Here, we use both a modified macrospin model and micromagnetic simulations to demonstrate a comprehensive antiferromagnetic resonance spectra in van der Waals magnets near the ultrathin (monolayer) limit. The number of optical and acoustic magnon modes, as well as the mode frequencies, are found to be exquisitely sensitive to the number of layers. We discover a self-hybridization effect where pairs of either optical or acoustic magnons are found to interact and self-hybridize through the dynamic exchange interaction. This leads to characteristic avoided energy level crossings in the energy spectra. Through simulations, we show that, by electrically controlling the damping of surface layers within heterostructures, both the strength and number of avoided energy level crossings in the magnon spectra can be controlled.

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  • Received 4 August 2020
  • Revised 1 February 2021
  • Accepted 16 February 2021

DOI:https://doi.org/10.1103/PhysRevApplied.15.044008

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Joseph Sklenar1,* and Wei Zhang2

  • 1Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48202, USA
  • 2Department of Physics, Oakland University, Rochester, Michigan 48309, USA

  • *jnsklenar@wayne.edu

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Vol. 15, Iss. 4 — April 2021

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