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Paper Abstract and Keywords
Presentation 2020-10-05 13:55
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 (Tanaka Kikinzoku), Shin Saito (Tohou Univ.) MRIS2020-2
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) Full granular media / granular cap layer / ferromagnetic oxide / flat surface / switching field distribution / homogeneous structure / rare earth oxide / perpendicular media  
Reference Info. IEICE Tech. Rep., vol. 120, no. 180, MRIS2020-2, pp. 6-11, Oct. 2020.
Paper # MRIS2020-2 
Date of Issue 2020-09-28 (MRIS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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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 MRIS2020-2

Conference Information
Committee MRIS ITE-MMS  
Conference Date 2020-10-05 - 2020-10-05 
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. 
Paper Information
Registration To MRIS 
Conference Code 2020-10-MRIS-MMS 
Language Japanese 
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.)
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Speaker
Date Time 2020-10-05 13:55:00 
Presentation Time 25 
Registration for MRIS 
Paper # IEICE-MRIS2020-2 
Volume (vol) IEICE-120 
Number (no) no.180 
Page pp.6-11 
#Pages IEICE-6 
Date of Issue IEICE-MRIS-2020-09-28 


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