Presentation 2018-12-07
Recording characteristics of microwave-assisted magnetic recording for granular media
Terumitsu Tanaka, Yasushi Kanai, Kimihide Matsuyama,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) Magnetization reversal process under the microwave assistance and microwave-assisted signal recording characteristics were numerically estimated assuming granular type exchange coupled composite media. Magnetization curves under the microwave fields become narrower when microwave frequency is high, resulting in low coercivity due to the microwave assistance for both the monolayer and exchange coupled composite media. When the microwave frequency exceeds a particular frequency, the hysteresis curves showed the extra step and the saturation field increases and is comparable to that without microwave assistance, which attributes to unstable magnetization precessions under the microwave fields. Coherency of the magnetization reversal were numerically characterized to estimate thermal stability for the media. Exchange coupled composite media with relatively soft magnetic layer showed incoherent reversal under the DC field. On the other hand the nudged elastic band calculation revealed that coherent rotation follows the minimum energy path when DC field is absent and estimated minimum energy barrier height were thermally stable at the room temperature. Signal recording simulation presented that microwave field induces ferromagnetic resonance at the soft layer and enhances writability, and then the signal to noise ratio increases.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Microwave-assisted magnetic recording / ECC media / Micromagnetic simulation
Paper # MRIS2018-26
Date of Issue 2018-11-29 (MRIS)

Conference Information
Committee MRIS / ITE-MMS
Conference Date 2018/12/6(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Ehime University
Topics (in Japanese) (See Japanese page)
Topics (in English) Signal Processing and Others
Chair Satoshi Matsunuma(Maxell) / Norihiko Ishii(NHK)
Vice Chair
Secretary (Toshiba) / (Kinki Univ.)
Assistant Ikuya Tagawa(Tohoku Inst. of Tech.) / Hiroko Arai(AIST)

Paper Information
Registration To Technical Committee on Magnetic Recording & Information Storage / Technical Group on Multi-media Storage
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Recording characteristics of microwave-assisted magnetic recording for granular media
Sub Title (in English)
Keyword(1) Microwave-assisted magnetic recording
Keyword(2) ECC media
Keyword(3) Micromagnetic simulation
1st Author's Name Terumitsu Tanaka
1st Author's Affiliation Kyushu University(Kyushu Univ.)
2nd Author's Name Yasushi Kanai
2nd Author's Affiliation Niigata Institute of Technology(Niigata Ins. Tech.)
3rd Author's Name Kimihide Matsuyama
3rd Author's Affiliation Kyushu University(Kyushu Univ.)
Date 2018-12-07
Paper # MRIS2018-26
Volume (vol) vol.118
Number (no) MRIS-347
Page pp.pp.47-52(MRIS),
#Pages 6
Date of Issue 2018-11-29 (MRIS)