Tunable magnon-magnon coupling in synthetic antiferromagnets

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Tunable magnon-magnon coupling in synthetic antiferromagnets

A. Sud, C. W. Zollitsch, A. Kamimaki, T. Dion, S. Khan, S. Iihama, S. Mizukami, and H. Kurebayashi

Phys. Rev. B 102, 100403(R) – Published 10 September 2020

Abstract

In this work, we study magnon-magnon coupling in synthetic antiferromagnets (SyAFs) using microwave spectroscopy at room temperature. Two distinct spin-wave modes are clearly observed and are hybridized at degeneracy points. We provide a phenomenological model that captures the coupling phenomena and experimentally demonstrate that the coupling strength is controlled by the out-of-plane tilt angle as well as the interlayer exchange field. We numerically show that a spin-current mediated damping in SyAFs plays a role in influencing the coupling strength.

Received 1 June 2020
Revised 3 August 2020
Accepted 4 August 2020

DOI:https://doi.org/10.1103/PhysRevB.102.100403

Physics Subject Headings (PhySH)

Magnetism Magnetization dynamics Magnons Spin current Spin dynamics

Magnetic multilayers Multilayer thin films

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. Sud^1,*, C. W. Zollitsch ¹, A. Kamimaki^2,3, T. Dion ¹, S. Khan¹, S. Iihama^4,5, S. Mizukami^3,5,6, and H. Kurebayashi^1,†

¹London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom
²Department of Applied Physics, Tohoku University, Aoba 6-6-05, Sendai 980-8579, Japan
³WPI Advanced Institude for Materials Research, Tohoku University, 2-1-1, Katahira, Sendai 980-8577, Japan
⁴Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
⁵Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
⁶Center for Science and Innovation in Spintronics, Tohoku University, Sendai 980-8577, Japan

^*aakanksha.sud.17@ucl.ac.uk
^†h.kurebayashi@ucl.ac.uk

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Issue

Vol. 102, Iss. 10 — 1 September 2020

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