2026-03-10 東北大学
図1. 迷路磁区を持つ鉄ガーネット膜モデルに磁界パルスを印加した際の磁気ドメインの時間変化をシミュレーションした。
＜関連情報＞
- https://www.tohoku.ac.jp/japanese/2026/03/press20260310-02-domain.html
- https://www.tohoku.ac.jp/japanese/newimg/pressimg/tohokuuniv-press20260310_02web_domain.pdf
- https://iopscience.iop.org/article/10.35848/1347-4065/ae41fa
強磁場パルスによって誘起される迷路ドメインを有する鉄ガーネット薄膜における非線形ギガヘルツ磁化振動 Nonlinear gigahertz magnetization oscillations in iron garnet films with maze domains induced by strong magnetic pulses
Takumi Koguchi, Hibiki Miyashita, Toshiaki Watanabe, Eri Negishi, Yuichi Nakamura, Mitsuteru Inoue, Kazushi Ishiyama, Mehmet C. Onbasli and Taichi Goto
Japanese Journal of Applied Physics Published: 23 February 2026
DOI:10.35848/1347-4065/ae41fa
Abstract
Maze-type magnetic domains in iron garnet films exhibit extraordinary dynamic responses to Tesla-order magnetic field pulses with nanosecond durations. Through micromagnetic simulations, we found that these magnetic domains oscillate at gigahertz frequencies through repeated domain expansion and shrinking. The oscillation frequency and amplitude respond nonlinearly to the pulse amplitude and width, enabling this system to function as a magnetic field-to-frequency converter. We also demonstrate a technique for sustaining continuous oscillations. These results provide insights into key functionalities for next-generation high-frequency magnetic device applications.
