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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 resistancemeasurements 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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Spin-torque oscillator, Magnetic recording, Spintronics, Injection locking

刊行年月日: 2026-01-21

出版者: Springer Science and Business Media LLC

掲載誌:

• Communications Physics (ISSN: 23993650) vol. 9 issue. 1 17

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s42005-025-02469-4

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更新時刻: 2026-02-11 12:30:06 +0900

MDRでの公開時刻: 2026-02-11 10:00:15 +0900