| Presentation | 2014-11-25 Influences of Damping Constants on Oscillation Behaviors of STO and Method for Increasing AC-Field Amplitude in MAMR Riki KOGA, Fumiko AKAGI, Kazuetu YOSHIDA, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Magnetic recording of a hard disk drive is suffering from a trilemma among noise, thermal fluctuation and writability, which prevents achieving high recording density. Microwave assisted magnetic recording (MAMR) is one of the promising recording methods to solve the trilemma. In this study, influences of damping constants of a writer, a medium and a spin torque oscillator (STO) on magnetic AC fields generated by STO were investigated by using micro-magnetic simulator in consideration of magnetic interactions. When the damping constants of the writer, the medium and field generation layer (FGL) in STO were 0.04, 0.04, and 0.05 respectively, AC field oscillated stably and the frequency resulted in 15 GHz. The amplitude of AC field was obtained up to 40 kA/m, however, which is still lower than our target level. Then, when FGL was doubled and the anisotropy constant of it decreased 5.0 × 10^3J/m^3 , AC field increased to twice its amount. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | microwave assisted magnetic recording / damping constant / ECC media / Landau-Lifshitz-Gilbart equation |
| Paper # | MR2014-23 |
| Date of Issue |
| Conference Information | |
| Committee | MR |
|---|---|
| Conference Date | 2014/11/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Magnetic Recording (MR) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Influences of Damping Constants on Oscillation Behaviors of STO and Method for Increasing AC-Field Amplitude in MAMR |
| Sub Title (in English) | |
| Keyword(1) | microwave assisted magnetic recording |
| Keyword(2) | damping constant |
| Keyword(3) | ECC media |
| Keyword(4) | Landau-Lifshitz-Gilbart equation |
| 1st Author's Name | Riki KOGA |
| 1st Author's Affiliation | Graduate School of Electrical Engineering and Electronics, Kogakuin University() |
| 2nd Author's Name | Fumiko AKAGI |
| 2nd Author's Affiliation | Graduate School of Electrical Engineering and Electronics, Kogakuin University |
| 3rd Author's Name | Kazuetu YOSHIDA |
| 3rd Author's Affiliation | Kogakuin University |
| Date | 2014-11-25 |
| Paper # | MR2014-23 |
| Volume (vol) | vol.114 |
| Number (no) | 327 |
| Page | pp.pp.- |
| #Pages | 5 |
| Date of Issue | |