Analysis method of a spin-torque oscillator using dc resistance change during injection locking to an external microwave magnetic field

Nagarjuna Asam, Hirofumi Suto, Shingo Tamaru, Hossein Sepehri-Amin, Anton Bolyachkin, Tomoya Nakatani, Weinan Zhou, Hitoshi Kubota, Yuya Sakuraba

研究成果: Article査読

抄録

Spin torque oscillators (STOs) that generate a persistent magnetization oscillation by spin-transfer torque are promising spintronic devices for various applications. In this study, we propose and experimentally demonstrate a method to characterize the magnetization dynamics of STOs using injection locking. By placing the STO near an antenna that generates a microwave magnetic field of a variable frequency, injection locking of the STO to the microwave field occurs when is in the locking range around the intrinsic oscillation frequency. During injection locking, the dc resistance of the STO exhibits a peak-and-valley dependence on W which originates from the modification of the magnetization trajectory induced by injection locking. Based on this principle, the oscillation frequency can be estimated by measuring the dc resistance change. Because this method does not require measuring the high-frequency magnetoresistance signal from the STO, which is used in the conventional method, it is advantageous in cases where the high-frequency magnetoresistance signal is undetectable or exhibits additional frequency components different from the oscillation frequency.

本文言語English
論文番号142405
ジャーナルApplied Physics Letters
119
14
DOI
出版ステータスPublished - 2021 10 4
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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