Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.12: Poster
Donnerstag, 12. März 2026, 15:00–17:00, P4
Distinctive Propagation of Phonon-mediated Magnons in YIG/GGG — •Youngseon Soon1, Moojune Song1, Phuoc Cao Van2, Jinhyun Baek1, Byong-Guk Park3, Jong-Ryul Jeong2, Albert Min Gyu Park1, and Kab-Jin Kim1 — 1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea — 2Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea — 3Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Magnonic systems enable information processing via collective spin excitations and couple efficiently to other quasiparticles. We study magnetostatic surface spin waves (MSSWs) coupled to standing acoustic waves in a 200-nm YIG film on GGG. Using two microwave antennas and VNA measurement, we observe 3.5 MHz periodic modulation in transmission spectra arising from magnetoelastic interaction. As the magnon wave vector k increases, these phononic signatures weaken and eventually vanish, reflecting both the k-dependence of the coupling and the momentum selectivity of antennas. Phonon-mediated magnon modes emerge at lower frequencies than directly excited MSSWs and propagate much farther, providing a low-k channel for long-distance spin-wave transport without acoustic resonators. These distinctive features highlight the wavevector-dependent magnon-phonon hybridization and demonstrate that both coupling strength and propagation behavior can be engineered through excitation geometry.
Keywords: Magnon-Phonon coupling; Magnetoelastic interaction; YIG; Magnetostatic surface spin waves (MSSWs); Acoustic waves