4.5 Article

Observation of mode splitting by magnon-magnon coupling in synthetic antiferromagnets

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APPLIED PHYSICS EXPRESS
卷 16, 期 5, 页码 -

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IOP Publishing Ltd
DOI: 10.35848/1882-0786/acd5a6

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We investigated the coherently excited propagating magnons in in-plane magnetized synthetic antiferromagnets using heterodyne-magnetooptical Kerr effect technique. Under an in-plane magnetic field at a 45-degree angle away from the magnon propagation direction, we observed mode splitting of the magnon dispersion relation due to magnon-magnon coupling between acoustic and optical magnon modes. Strong coupling with a cooperativity of 8.4 +/- 1.3 was achieved for finite wavenumber. These results provide a deep understanding of the properties of coherently excited magnons in synthetic antiferromagnets, which will be helpful for designing advanced magnonic devices.
We investigated the coherently excited propagating magnons in in-plane magnetized synthetic antiferromagnets using heterodyne-magnetooptical Kerr effect technique. Under the in-plane magnetic field to 45 degrees away from the magnon propagation direction, we observed the mode splitting of magnon dispersion relation due to the magnon-magnon coupling between acoustic and optical magnon modes. The strong coupling with a cooperativity of 8.4 +/- 1.3 is achieved for finite wavenumber. These results provide a deep understanding of the properties of coherently excited magnons in synthetic antiferromagnets, which will be helpful for designing advanced magnonic devices. (c) 2023 The Japan Society of Applied Physics

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