Microwave-assisted magnetization reversal for granular media by a resonant cavity method

Shintaro Hinata; Shin Saito; Migaku Takahashi; Masashi Sahashi

doi:10.1109/TMAG.2014.2322450

Microwave-assisted magnetization reversal for granular media by a resonant cavity method

Shintaro Hinata, Shin Saito, Migaku Takahashi, Masashi Sahashi

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

2 Citations (Scopus)

Abstract

Microwave-assisted magnetization reversal was verified by a cavity method with intention to apply homogenous microwave to a millimeter-size CoPT_Cr-SiO₂ medium. By applying 34 GHz microwave with various power, magnetization reversal of the medium was assisted. The amount of the reversal magnetization was estimated using an internal magnetic field evaluated with ferromagnetic resonance (FMR) field. As a result, it is found that: 1) when the incident angle of external field is set at 90° (perpendicular), assisting effect depends on microwave power and magnetization of the media; 2) mode value of swiT_Ching field distribution of the media was reduced 300 Oe by 160-mW microwave assisting; and 3) when the incident angle of external field is set at 45° during the microwave assisting, dispersion of the SFD decreased with increasing microwave power.

Original language	English
Article number	6971632
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2014.2322450
Publication status	Published - 2014 Nov 1

Keywords

Cavity method
ferromagnetic resonance (FMR)
microwave-assisted magnetization reversal
perpendicular recording

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2014.2322450

Cite this

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title = "Microwave-assisted magnetization reversal for granular media by a resonant cavity method",

abstract = "Microwave-assisted magnetization reversal was verified by a cavity method with intention to apply homogenous microwave to a millimeter-size CoPTCr-SiO2 medium. By applying 34 GHz microwave with various power, magnetization reversal of the medium was assisted. The amount of the reversal magnetization was estimated using an internal magnetic field evaluated with ferromagnetic resonance (FMR) field. As a result, it is found that: 1) when the incident angle of external field is set at 90° (perpendicular), assisting effect depends on microwave power and magnetization of the media; 2) mode value of swiTChing field distribution of the media was reduced 300 Oe by 160-mW microwave assisting; and 3) when the incident angle of external field is set at 45° during the microwave assisting, dispersion of the SFD decreased with increasing microwave power.",

keywords = "Cavity method, ferromagnetic resonance (FMR), microwave-assisted magnetization reversal, perpendicular recording",

author = "Shintaro Hinata and Shin Saito and Migaku Takahashi and Masashi Sahashi",

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doi = "10.1109/TMAG.2014.2322450",

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T1 - Microwave-assisted magnetization reversal for granular media by a resonant cavity method

AU - Hinata, Shintaro

AU - Saito, Shin

AU - Takahashi, Migaku

AU - Sahashi, Masashi

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Microwave-assisted magnetization reversal was verified by a cavity method with intention to apply homogenous microwave to a millimeter-size CoPTCr-SiO2 medium. By applying 34 GHz microwave with various power, magnetization reversal of the medium was assisted. The amount of the reversal magnetization was estimated using an internal magnetic field evaluated with ferromagnetic resonance (FMR) field. As a result, it is found that: 1) when the incident angle of external field is set at 90° (perpendicular), assisting effect depends on microwave power and magnetization of the media; 2) mode value of swiTChing field distribution of the media was reduced 300 Oe by 160-mW microwave assisting; and 3) when the incident angle of external field is set at 45° during the microwave assisting, dispersion of the SFD decreased with increasing microwave power.

AB - Microwave-assisted magnetization reversal was verified by a cavity method with intention to apply homogenous microwave to a millimeter-size CoPTCr-SiO2 medium. By applying 34 GHz microwave with various power, magnetization reversal of the medium was assisted. The amount of the reversal magnetization was estimated using an internal magnetic field evaluated with ferromagnetic resonance (FMR) field. As a result, it is found that: 1) when the incident angle of external field is set at 90° (perpendicular), assisting effect depends on microwave power and magnetization of the media; 2) mode value of swiTChing field distribution of the media was reduced 300 Oe by 160-mW microwave assisting; and 3) when the incident angle of external field is set at 45° during the microwave assisting, dispersion of the SFD decreased with increasing microwave power.

KW - Cavity method

KW - ferromagnetic resonance (FMR)

KW - microwave-assisted magnetization reversal

KW - perpendicular recording

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Microwave-assisted magnetization reversal for granular media by a resonant cavity method

Abstract

Keywords

ASJC Scopus subject areas

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