Micromagnetic Model Analysis of Spin-Torque Oscillator (STO) Integrated into Recording Head for Microwave-Assisted Magnetic Recording-Oscillation of STO Versus Rise Time of In-Gap Field

Yasushi Kanai; Ryo Itagaki; Simon J. Greaves; Hiroaki Muraoka

doi:10.1109/TMAG.2018.2848279

Micromagnetic Model Analysis of Spin-Torque Oscillator (STO) Integrated into Recording Head for Microwave-Assisted Magnetic Recording-Oscillation of STO Versus Rise Time of In-Gap Field

Yasushi Kanai, Ryo Itagaki, Simon J. Greaves, Hiroaki Muraoka

Broadband Engineering Division

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

4 Citations (Scopus)

Abstract

Stable oscillation is one of the most important factors for spin-torque oscillators (STOs) used in a microwave-assisted magnetic recording system. We use a micromagnetic, integrated STO model, in which the STO is inserted into the main pole-trailing shield (MP-TS) gap of a write head, and show that the rise time of the in-gap field acting on the STO is critical to stable STO oscillation. We also show that the combination of a tilted STO and a tilted MP-TS gap results in stable STO oscillation due to weaker magnetostatic interactions between the STO and the write head.

Original language	English
Article number	8409462
Journal	IEEE Transactions on Magnetics
Volume	54
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2018.2848279
Publication status	Published - 2018 Nov

Keywords

Micromagnetic simulation
microwave-assisted magnetic recording (MAMR)
rise time of in-gap field
spin torque oscillator (STO)
write heads

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2018.2848279

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Micromagnetic Model Analysis of Spin-Torque Oscillator (STO) Integrated into Recording Head for Microwave-Assisted Magnetic Recording-Oscillation of STO Versus Rise Time of In-Gap Field. / Kanai, Yasushi; Itagaki, Ryo; Greaves, Simon J. et al.
In: IEEE Transactions on Magnetics, Vol. 54, No. 11, 8409462, 11.2018.

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

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title = "Micromagnetic Model Analysis of Spin-Torque Oscillator (STO) Integrated into Recording Head for Microwave-Assisted Magnetic Recording-Oscillation of STO Versus Rise Time of In-Gap Field",

abstract = "Stable oscillation is one of the most important factors for spin-torque oscillators (STOs) used in a microwave-assisted magnetic recording system. We use a micromagnetic, integrated STO model, in which the STO is inserted into the main pole-trailing shield (MP-TS) gap of a write head, and show that the rise time of the in-gap field acting on the STO is critical to stable STO oscillation. We also show that the combination of a tilted STO and a tilted MP-TS gap results in stable STO oscillation due to weaker magnetostatic interactions between the STO and the write head.",

keywords = "Micromagnetic simulation, microwave-assisted magnetic recording (MAMR), rise time of in-gap field, spin torque oscillator (STO), write heads",

author = "Yasushi Kanai and Ryo Itagaki and Greaves, {Simon J.} and Hiroaki Muraoka",

note = "Funding Information: ACKNOWLEDGMENT This work was supported in part by the Japan Society for the Promotion of Science Kaken-hi under Grant 16K06321 and in part by the Advance Storage Research Consortium. The authors would like to thank the JSOL Corporation, Tokyo, Japan, for the software support. Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

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AU - Kanai, Yasushi

AU - Itagaki, Ryo

AU - Greaves, Simon J.

AU - Muraoka, Hiroaki

N1 - Funding Information: ACKNOWLEDGMENT This work was supported in part by the Japan Society for the Promotion of Science Kaken-hi under Grant 16K06321 and in part by the Advance Storage Research Consortium. The authors would like to thank the JSOL Corporation, Tokyo, Japan, for the software support. Publisher Copyright: © 1965-2012 IEEE.

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N2 - Stable oscillation is one of the most important factors for spin-torque oscillators (STOs) used in a microwave-assisted magnetic recording system. We use a micromagnetic, integrated STO model, in which the STO is inserted into the main pole-trailing shield (MP-TS) gap of a write head, and show that the rise time of the in-gap field acting on the STO is critical to stable STO oscillation. We also show that the combination of a tilted STO and a tilted MP-TS gap results in stable STO oscillation due to weaker magnetostatic interactions between the STO and the write head.

AB - Stable oscillation is one of the most important factors for spin-torque oscillators (STOs) used in a microwave-assisted magnetic recording system. We use a micromagnetic, integrated STO model, in which the STO is inserted into the main pole-trailing shield (MP-TS) gap of a write head, and show that the rise time of the in-gap field acting on the STO is critical to stable STO oscillation. We also show that the combination of a tilted STO and a tilted MP-TS gap results in stable STO oscillation due to weaker magnetostatic interactions between the STO and the write head.

KW - Micromagnetic simulation

KW - microwave-assisted magnetic recording (MAMR)

KW - rise time of in-gap field

KW - spin torque oscillator (STO)

KW - write heads

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Micromagnetic Model Analysis of Spin-Torque Oscillator (STO) Integrated into Recording Head for Microwave-Assisted Magnetic Recording-Oscillation of STO Versus Rise Time of In-Gap Field

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