SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.81: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Magnon-polariton in BiFeO3 — •Ryo Kainuma¹, Keita Matsumoto^{1, 2}, Toshimitsu Ito³, and Takuya Satoh¹ — ¹Tokyo Institute of Technology, Tokyo, Japan — ²Kyushu University, Fukuoka, Japan — ³National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

Magnon is a quantum of collective excitation in magnetically ordered materials and is considered an alternative information career. In antiferromagnets, magnons have a higher frequency than ferromagnets, but in the long-wavelength region, they usually do not have enough group velocity and prevent magnonic information transport. However, considering magnon-photon coupling, magnon may have a large group velocity comparable to the speed of light as a coupled state, magnon-polariton. We performed a pump-probe imaging measurement to obtain spatiotemporal waveforms of magnon-polariton in BiFeO3 and visualized the time evolution of components excited in a wavenumber-frequency space. We confirmed the signal of magnon-polariton from its temperature dependence and found that magnon-polariton propagated over hundreds of micrometers in tens of picoseconds. Our new observations shed light on understanding the ultrafast dynamics of antiferromagnets.