2026-01-22 株式会社東芝
図1： MAS-MAMR記録動作と本評価手法のイメージ図
＜関連情報＞
- https://www.global.toshiba/jp/technology/corporate/rdc/rd/topics/26/2601-01.html
- https://www.nature.com/articles/s42005-025-02469-4
注入同期を用いたスピントルク発振器内の結合状態の決定 Determination of coupling state within a spin-torque oscillator using injection locking
Yuji Nakagawa,Hirofumi Suto,Yuya Sakuraba & Tomoyuki Maeda
Communications Physics Published:21 January 2026
DOI:https://doi.org/10.1038/s42005-025-02469-4
Abstract
Dynamic interactions between magnetizations enable complex operations in spintronic devices, such as coupled oscillation in spin-torque oscillators (STOs). Here, we report the experimental determination of coupling states in an STO using an analysis method based on injection locking. The STO is developed for assisted magnetic recording in hard disk drives and exhibits coupled oscillation of two magnetic layers and oscillation of a single magnetic layer depending on bias current polarities, with the former operation improving recording performance. While conventional spectrum measurements yield similar peaks for both oscillations, our method clearly distinguishes between the coupled and single oscillation modes through resistance measurements because of the insensitivity of the coupled oscillation to injection locking, as supported by simulations. Our results demonstrate that the injection locking method provides a sensitive probe for examining coupled oscillation states and is widely applicable to the development of spintronic devices functionalized through dynamic coupling.
