| Presentation | 2018-12-07 Recording characteristics of microwave-assisted magnetic recording for granular media Terumitsu Tanaka, Yasushi Kanai, Kimihide Matsuyama, |
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| PDF Download Page |  PDF download Page Link |
| 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 |
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| 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 |
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| 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) |