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

共 7 条

[1] Inducing out-of-plane precession of magnetization for microwave-assisted magnetic recording with an oscillating polarizer in a spin-torque oscillator
Zhou, W.
Sepehri-Amin, H.
Taniguchi, T.
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Sakuraba, Y.
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Kubota, H.
Hono, K.
APPLIED PHYSICS LETTERS, 2019, 114 (17)
[2] Oscillation Feature of Planar Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording
Igarashi, Masukazu
Suzuki, Yoshio
Sato, Yo
IEEE TRANSACTIONS ON MAGNETICS, 2010, 46 (10) : 3738 - 3741
[3] Thin Spin-torque Oscillator With High AC-Field for High Density Microwave-Assisted Magnetic Recording
Sato, Yo
Sugiura, Kenji
Igarashi, Masukazu
Watanabe, Katsuro
Shiroishi, Yoshihiro
IEEE TRANSACTIONS ON MAGNETICS, 2013, 49 (07) : 3632 - 3635
[4] Critical current density of a spin-torque oscillator with an in-plane magnetized free layer and an out-of-plane magnetized polarizer
Matsumoto, R.
Imamura, H.
AIP ADVANCES, 2016, 6 (12):
[5] Hysteresis regime in the operation of a dual-free-layer spin-torque nano-oscillator with out-of-plane counter-precessing magnetic moments
Prokopenko, O. V.
Krivorotov, I. N.
Bankowski, E. N.
Meitzler, T. J.
Tiberkevich, V. S.
Slavin, A. N.
JOURNAL OF APPLIED PHYSICS, 2013, 114 (17)
[6] High Q factor over 3000 due to out-of-plane precession in nano-contact spin-torque oscillator based on magnetic tunnel junctions
Maehara, Hiroki
Kubota, Hitoshi
Suzuki, Yoshishige
Seki, Takayuki
Nishimura, Kazumasa
Nagamine, Yoshinori
Tsunekawa, Koji
Fukushima, Akio
Arai, Hiroko
Taniguchi, Tomohiro
Imamura, Hiroshi
Ando, Koji
Yuasa, Shinji
APPLIED PHYSICS EXPRESS, 2014, 7 (02)
[7] Out-of-plane magnetization oscillation in spin Hall device assisted by field-like torque
Taniguchi, Tomohiro
APPLIED PHYSICS LETTERS, 2021, 118 (14)

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