| Presentation | 2015-06-04 Dual free-layer spin-torque oscillator for read head application in magnetic recording Tazumi Nagasawa, Kiwamu Kudo, Hirofumi Suto, Michinaga Yamagishi, Koichi Mizushima, Rie Sato, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Read heads for HDDs with areal density over 2 Tb/in2 are predicted to suffer from magnetic noises that seriously reduce the signal-to-noise (S/N) ratio. To overcome this problem, a novel read head composed of a spin-torque oscillator (STO) has recently been proposed. For the implementation of an STO read head, large-amplitude microwave emissions with narrow spectral linewidth are required. In this article, we experimentally study the oscillation properties of an STO with a dual free layer and its response to a pulsed magnetic field. This type of STO shows large-amplitude oscillations with narrow linewidth because of synchronized magnetization motions in the two free layers. In addition, this STO has a thinner structure than the conventional one. This feature is preferable for an STO read head, in which the STO needs to be placed inside a narrow shield-to-shield gap to obtain high spatial resolution. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Spin-Torque Oscillator / STO / Magnetic Recording / Read Head / Dual Free Layer |
| Paper # | MR2015-2 |
| Date of Issue | 2015-05-28 (MR) |
| Conference Information | |
| Committee | MR / ITE-MMS |
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| Conference Date | 2015/6/4(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tohoku Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Recording Systems, etc. |
| Chair | Masukazu Igarashi(*) / Eiichi Miyashita(NHK) |
| Vice Chair | |
| Secretary | (Syowa Denko) / (Toshiba) |
| Assistant | Fumiko Akagi(Kogakuin Univ.) / Takayuki Shima(AIST) |
| Paper Information | |
| Registration To | Technical Committee on Magnetic Recording / 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) | Dual free-layer spin-torque oscillator for read head application in magnetic recording |
| Sub Title (in English) | |
| Keyword(1) | Spin-Torque Oscillator |
| Keyword(2) | STO |
| Keyword(3) | Magnetic Recording |
| Keyword(4) | Read Head |
| Keyword(5) | Dual Free Layer |
| 1st Author's Name | Tazumi Nagasawa |
| 1st Author's Affiliation | Toshiba Corporation(Toshiba) |
| 2nd Author's Name | Kiwamu Kudo |
| 2nd Author's Affiliation | Toshiba Corporation(Toshiba) |
| 3rd Author's Name | Hirofumi Suto |
| 3rd Author's Affiliation | Toshiba Corporation(Toshiba) |
| 4th Author's Name | Michinaga Yamagishi |
| 4th Author's Affiliation | Toshiba Corporation(Toshiba) |
| 5th Author's Name | Koichi Mizushima |
| 5th Author's Affiliation | Toshiba Corporation(Toshiba) |
| 6th Author's Name | Rie Sato |
| 6th Author's Affiliation | Toshiba Corporation(Toshiba) |
| Date | 2015-06-04 |
| Paper # | MR2015-2 |
| Volume (vol) | vol.115 |
| Number (no) | MR-71 |
| Page | pp.pp.7-12(MR), |
| #Pages | 6 |
| Date of Issue | 2015-05-28 (MR) |