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Paper Abstract and Keywords
Presentation 2016-06-09 13:50
Effect of oxide boundary materials on magnetic properties for CoPt-based granular media
Kim Kong Tham, Ryosuke Kushibiki (Tanaka Kikinzoku), Shintaro Hinata, Shin Saito (Tohoku Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) The magnetic properties and structures of Co80Pt20-30 vol% oxide (ZrO2, Cr2O3, Y2O3, Al2O3, MnO, TiO2, WO2, SiO2, Mn3O4, WO3, Co3O4, MoO3, and B2O3) granular media deposited at room temperature were investigated. As a result, the following were found. 1) By employing oxides with low melting point temperatures as the granular media, magnetic grains with high saturation magnetization (Msgrain) and perpendicular magnetic anisotropy (Kugrain) are obtained; the increases in Msgrain and Kugrain are due to the promotion of the columnar growth of magnetic grains and phase separation or two-phase precipitation between magnetic grains and oxides. 2) The increase in the Kugrain of the granular media followed by the decrease in the melting point of oxides is due to the reduction in the amount of stacking faults. 3) Among these granular media, the CoPt-B2O3 granular medium has the highest coercivity (Hc) and ratio of Hc to the magnetic anisotropy field (Hc/Hkgrain) of 8.0 kOe and 0.4, with Msgrain and Kugrain of 1115 emu/cm3 and 1.1×107 erg/cm3. 4) The CoPt-B2O3 granular medium has well-isolated and columnar growth magnetic grains with an average grain size of 6.5 nm.
Keyword (in Japanese) (See Japanese page) 
(in English) Perpendicular magnetic recording / high magneto-crystalline anisotropy / CoPt-B2O3 granular medium / oxide boundary materials / melting point temperature / / /  
Reference Info. ITE Tech. Rep.
Paper #  
Date of Issue  
ISSN Print edition: ISSN 1342-6893  Online edition: ISSN 2424-1970
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Conference Information
Committee IEICE-MRIS MMS  
Conference Date 2016-06-09 - 2016-06-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Recording Systems, etc. 
Paper Information
Registration To IEICE-MRIS 
Conference Code 2016-06-MR-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Effect of oxide boundary materials on magnetic properties for CoPt-based granular media 
Sub Title (in English)  
Keyword(1) Perpendicular magnetic recording  
Keyword(2) high magneto-crystalline anisotropy  
Keyword(3) CoPt-B2O3 granular medium  
Keyword(4) oxide boundary materials  
Keyword(5) melting point temperature  
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Keyword(7)  
Keyword(8)  
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 Shintaro Hinata  
3rd Author's Affiliation Tohoku Univ. (Tohoku Univ.)
4th Author's Name Shin Saito  
4th Author's Affiliation Tohoku Univ. (Tohoku Univ.)
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Speaker
Date Time 2016-06-09 13:50:00 
Presentation Time 25 
Registration for IEICE-MRIS 
Paper #  
Volume (vol) 40 
Number (no)  
Page  
#Pages  
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