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Paper Abstract and Keywords
Presentation 2008-10-10 09:00
[Invited Talk] Dual segregant perpendicular media with gradation of magnetic and structual properties
Hiroyuki Nakagawa, Ryouko Araki, Reiko Arai, Hiroaki Nemoto, Kiwamu Tanahashi, Hidekazu Kashiwase (Hitachi) MR2008-25 Link to ES Tech. Rep. Archives: MR2008-25
Abstract (in Japanese) (See Japanese page) 
(in English) We have introduced structural and magnetic gradations into the granular layer so as to be a well-isolated structure with Si-oxide and Cr-oxide segregated to the grain boundary at the bottom portion and a less-isolated structure, low Ms, and low Ku with Cr remaining in the core at the top portion. These gradations enable us to use thinner cap and promote incoherent magnetization reversal, resulting in the reduction of magnetic cluster size, switching field, and its distribution. The graded media with shallower Hcr angular dependence and small magnetic cluster size shows better OW, SNR, and ATI performance.
Keyword (in Japanese) (See Japanese page) 
(in English) incoherent switching / structural and magnetic gradations / switching field distribution / small magnetic cluster size / ATI / graded media / /  
Reference Info. IEICE Tech. Rep., vol. 108, Oct. 2008.
Paper #  
Date of Issue 2008-10-02 (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 MR2008-25 Link to ES Tech. Rep. Archives: MR2008-25

Conference Information
Committee MRIS ITE-MMS  
Conference Date 2008-10-09 - 2008-10-10 
Place (in Japanese) (See Japanese page) 
Place (in English) AIT, Akita Research and Development Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Head, media and general 
Paper Information
Registration To MRIS 
Conference Code 2008-10-MR-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Dual segregant perpendicular media with gradation of magnetic and structual properties 
Sub Title (in English)  
Keyword(1) incoherent switching  
Keyword(2) structural and magnetic gradations  
Keyword(3) switching field distribution  
Keyword(4) small magnetic cluster size  
Keyword(5) ATI  
Keyword(6) graded media  
1st Author's Name Hiroyuki Nakagawa  
1st Author's Affiliation Central Research Laboratory (Hitachi)
2nd Author's Name Ryouko Araki  
2nd Author's Affiliation Central Research Laboratory (Hitachi)
3rd Author's Name Reiko Arai  
3rd Author's Affiliation Central Research Laboratory (Hitachi)
4th Author's Name Hiroaki Nemoto  
4th Author's Affiliation Central Research Laboratory (Hitachi)
5th Author's Name Kiwamu Tanahashi  
5th Author's Affiliation Central Research Laboratory (Hitachi)
6th Author's Name Hidekazu Kashiwase  
6th Author's Affiliation Central Research Laboratory (Hitachi)
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Speaker Author-1 
Date Time 2008-10-10 09:00:00 
Presentation Time 50 minutes 
Registration for MRIS 
Paper # MR2008-25 
Volume (vol) vol.108 
Number (no) no.234 
Page pp.37-42 
Date of Issue 2008-10-02 (MR) 

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