| Presentation | 2020-10-05 Switching field and surface control of CoPt based full granular media by utilizing granular cap layer with ferromagnetic grain boundary Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shin Saito, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Investigation of magnetic properties and nanostructure for full granular media with CoPt-Gd2O3 granular cap layers (CLs) of various Gd2O3 content were conducted. Media with low surface roughness of 0.19 nm is obtained even though Gd2O3 content is reduced from 30 to 5 vol%, which is lower than that of media with CoPtCrB continuous CL. The result is supported by surface morphology observed by transmission electron microscopy. According to cross-section element analysis, homogeneous nanostructure in the thickness direction with one-on-one columnar growth of magnetic grain is observed. Reduction of Gd2O3 content increases indirect intergranular exchange coupling through CL which result in media with higher nucleation field and lower saturation field than that of media with CoPtCrB continuous CL. Furthermore, at CL thickness of 6 nm, when Gd2O3 content is reduced from 30 to 15 vol%, switching field distribution is reduced from 0.11 to 0.05. This results suggests that the reduction of Gd2O3 content of the CoPt-Gd2O3 granular CL is effective to reduce the switching field distribution of the full granular media to be lower than that of media with CoPtCrB continuous CL while having an extremely smooth media surface. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Full granular media / granular cap layer / ferromaｇnetic oxide / flat surface / switching field distribution / homogeneous structure / rare earth oxide / perpendicular media |
| Paper # | MRIS2020-2 |
| Date of Issue | 2020-09-28 (MRIS) |
| Conference Information | |
| Committee | MRIS / ITE-MMS |
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| Conference Date | 2020/10/5(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Recording Head, Spintronics, Solid State Memory, Media, etc. |
| Chair | Shuhei Yoshida(Kinki Univ.) / Kenji Machida(NHK) |
| Vice Chair | |
| Secretary | (Tohoku Inst. of Tech.) / (AIST) |
| Assistant | Yasuaki Nakamura(Ehime Univ.) / Yoshiyuki Hirayama(Samsung) |
| 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) | Switching field and surface control of CoPt based full granular media by utilizing granular cap layer with ferromagnetic grain boundary |
| Sub Title (in English) | |
| Keyword(1) | Full granular media |
| Keyword(2) | granular cap layer |
| Keyword(3) | ferromaｇnetic oxide |
| Keyword(4) | flat surface |
| Keyword(5) | switching field distribution |
| Keyword(6) | homogeneous structure |
| Keyword(7) | rare earth oxide |
| Keyword(8) | perpendicular media |
| 1st Author's Name | Kim Kong Tham |
| 1st Author's Affiliation | Tanaka Kikinzoku Kogyo K. K.(Tanaka Kikinzoku) |
| 2nd Author's Name | Ryosuke Kushibiki |
| 2nd Author's Affiliation | Tanaka Kikinzoku Kogyo K. K.(Tanaka Kikinzoku) |
| 3rd Author's Name | Tomonari Kamada |
| 3rd Author's Affiliation | Tanaka Kikinzoku Kogyo K. K.(Tanaka Kikinzoku) |
| 4th Author's Name | Shin Saito |
| 4th Author's Affiliation | Tohoku University(Tohou Univ.) |
| Date | 2020-10-05 |
| Paper # | MRIS2020-2 |
| Volume (vol) | vol.120 |
| Number (no) | MRIS-180 |
| Page | pp.pp.6-11(MRIS), |
| #Pages | 6 |
| Date of Issue | 2020-09-28 (MRIS) |