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Nonlocal Coupling between Antiferromagnets and Ferromagnets in Cavities

Johansen, Øyvind; Brataas, Arne
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2593400
Date
2018
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  • Institutt for fysikk [1764]
  • Publikasjoner fra CRIStin - NTNU [19946]
Original version
Physical Review Letters. 2018, 121 (8), .   10.1103/PhysRevLett.121.087204
Abstract
Microwaves couple to magnetic moments in both ferromagnets and antiferromagnets. Although the magnons in ferromagnets and antiferromagnets radically differ, they can become entangled via strong coupling to the same microwave mode in a cavity. The equilibrium configuration of the magnetic moments crucially governs the coupling between the different magnons, because the antiferromagnetic and ferromagnetic magnons have opposite spins when their dispersion relations cross. We derive analytical expressions for the coupling strengths and find that the coupling between antiferromagnets and ferromagnets is comparable to the coupling between two ferromagnets. Our findings reveal a robust link between cavity spintronics with ferromagnets and antiferromagnets.
Publisher
American Physical Society
Journal
Physical Review Letters

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