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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.) MR2016-3 Link to ES Tech. Rep. Archives: MR2016-3
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. IEICE Tech. Rep., vol. 116, June 2016.
Paper #  
Date of Issue 2016-06-02 (MR) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MR2016-3 Link to ES Tech. Rep. Archives: MR2016-3

Conference Information
Committee MRIS ITE-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 MRIS 
Conference Code 2016-06-MR-MMS 
Language English (Japanese title is available) 
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  
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 Author-1 
Date Time 2016-06-09 13:50:00 
Presentation Time 25 minutes 
Registration for MRIS 
Paper # MR2016-3 
Volume (vol) vol.116 
Number (no) no.83 
Page pp.11-16 
Date of Issue 2016-06-02 (MR) 

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