Spin-torque oscillator with coupled out-of-plane oscillation layers for microwave-assisted magnetic recording: Experimental, analytical, and numerical studies

被引：7

作者：

Nakagawa, Yuji ^{[1
]}

Takagishi, Masayuki ^{[1
]}

Narita, Naoyuki ^{[1
]}

Nagasawa, Tazumi ^{[1
]}

Koizumi, Gaku ^{[2
]}

Chen, Wenyu ^{[3
]}

Kawasaki, Shohei ^{[3
]}

Roppongi, Tetsuya ^{[3
]}

Takeo, Akihiko ^{[2
]}

Maeda, Tomoyuki ^{[1
]}

机构：

[1] Toshiba Co Ltd, Corp Res & Dev Ctr, Kawasaki 2128582, Japan

[2] Toshiba Elect Devices & Storage Corp, Yokohama 2358522, Japan

[3] Headway Technol Inc, Milpitas, CA 95035 USA

来源：

APPLIED PHYSICS LETTERS | 2023年 / 122卷 / 04期

关键词：

PHASE-LOCKING; DRIVEN;

D O I：

10.1063/5.0133921

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Spin-torque oscillators (STOs) are unique spintronic devices in which spin current induces the precession of magnetization in the oscillation layer. In this study, we demonstrate coupled out-of-plane oscillation between two oscillation layers within an STO. The coupled oscillation state is observed in the magnetoresistance spectra as well as its degradation due to the mixing of the free oscillation state depending on the bias current. These behaviors are analytically described and numerically reproduced based on the Landau-Lifshitz-Gilbert equation. Since the STO is fabricated in the write head of a hard disk drive, the coupled oscillation state and the subsequent microwave magnetic field are applicable for microwave-assisted magnetic recording for high-density recording.

引用

页数：5