Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction between Write Head and STO and Optimum Injected Current

Yasushi Kanai; Takuto Katayama; Kazuetsu Yoshida; Simon Greaves; Hiroaki Muraoka

doi:10.1109/TMAG.2015.2508035

Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction between Write Head and STO and Optimum Injected Current

Yasushi Kanai, Takuto Katayama, Kazuetsu Yoshida, Simon Greaves, Hiroaki Muraoka

Broadband Engineering Division

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording (MAMR). To realize MAMR, a small injected STO current is mandatory, as are large amplitude and stable oscillations. In this paper, an isolated STO element (without the write head) and an STO integrated into a write head were analyzed using micromagnetic analysis. First, the integrated STO was used and the optimum injected currents ( J_opts ) that excite high-frequency magnetic fields were derived for various Gilbert damping factors (αs) and saturation magnetization (4πM_s) in the field generating layer. Second, J_opts were derived for various isolated STO structures. The effect of the material characteristics on J_opt was also investigated.

Original language	English
Article number	7353178
Journal	IEEE Transactions on Magnetics
Volume	52
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2015.2508035
Publication status	Published - 2016 Jul

Keywords

Micromagnetic simulation
Spin-Torque oscillator
microwave-assisted magnetic recording
spin injected current

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2015.2508035

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Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction between Write Head and STO and Optimum Injected Current. / Kanai, Yasushi; Katayama, Takuto; Yoshida, Kazuetsu; Greaves, Simon; Muraoka, Hiroaki.

In: IEEE Transactions on Magnetics, Vol. 52, No. 7, 7353178, 07.2016.

Research output: Contribution to journal › Article › peer-review

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abstract = "The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording (MAMR). To realize MAMR, a small injected STO current is mandatory, as are large amplitude and stable oscillations. In this paper, an isolated STO element (without the write head) and an STO integrated into a write head were analyzed using micromagnetic analysis. First, the integrated STO was used and the optimum injected currents ( Jopts ) that excite high-frequency magnetic fields were derived for various Gilbert damping factors (αs) and saturation magnetization (4πMs) in the field generating layer. Second, Jopts were derived for various isolated STO structures. The effect of the material characteristics on Jopt was also investigated.",

keywords = "Micromagnetic simulation, Spin-Torque oscillator, microwave-assisted magnetic recording, spin injected current",

author = "Yasushi Kanai and Takuto Katayama and Kazuetsu Yoshida and Simon Greaves and Hiroaki Muraoka",

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AU - Yoshida, Kazuetsu

AU - Greaves, Simon

AU - Muraoka, Hiroaki

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Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction between Write Head and STO and Optimum Injected Current

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Keywords

ASJC Scopus subject areas

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