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Paper Abstract and Keywords
Presentation 2018-12-07 11:00
Recording characteristics of microwave-assisted magnetic recording for granular media
Terumitsu Tanaka (Kyushu Univ.), Yasushi Kanai (Niigata Ins. Tech.), Kimihide Matsuyama (Kyushu Univ.) MRIS2018-26
Abstract (in Japanese) (See Japanese page) 
(in English) Magnetization reversal process under the microwave assistance and microwave-assisted signal recording characteristics were numerically estimated assuming granular type exchange coupled composite media. Magnetization curves under the microwave fields become narrower when microwave frequency is high, resulting in low coercivity due to the microwave assistance for both the monolayer and exchange coupled composite media. When the microwave frequency exceeds a particular frequency, the hysteresis curves showed the extra step and the saturation field increases and is comparable to that without microwave assistance, which attributes to unstable magnetization precessions under the microwave fields. Coherency of the magnetization reversal were numerically characterized to estimate thermal stability for the media. Exchange coupled composite media with relatively soft magnetic layer showed incoherent reversal under the DC field. On the other hand the nudged elastic band calculation revealed that coherent rotation follows the minimum energy path when DC field is absent and estimated minimum energy barrier height were thermally stable at the room temperature. Signal recording simulation presented that microwave field induces ferromagnetic resonance at the soft layer and enhances writability, and then the signal to noise ratio increases.
Keyword (in Japanese) (See Japanese page) 
(in English) Microwave-assisted magnetic recording / ECC media / Micromagnetic simulation / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 347, MRIS2018-26, pp. 47-52, Dec. 2018.
Paper # MRIS2018-26 
Date of Issue 2018-11-29 (MRIS) 
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MRIS2018-26

Conference Information
Committee MRIS ITE-MMS  
Conference Date 2018-12-06 - 2018-12-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Ehime University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing and Others 
Paper Information
Registration To MRIS 
Conference Code 2018-12-MRIS-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Recording characteristics of microwave-assisted magnetic recording for granular media 
Sub Title (in English)  
Keyword(1) Microwave-assisted magnetic recording  
Keyword(2) ECC media  
Keyword(3) Micromagnetic simulation  
1st Author's Name Terumitsu Tanaka  
1st Author's Affiliation Kyushu University (Kyushu Univ.)
2nd Author's Name Yasushi Kanai  
2nd Author's Affiliation Niigata Institute of Technology (Niigata Ins. Tech.)
3rd Author's Name Kimihide Matsuyama  
3rd Author's Affiliation Kyushu University (Kyushu Univ.)
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Date Time 2018-12-07 11:00:00 
Presentation Time 30 
Registration for MRIS 
Paper # IEICE-MRIS2018-26 
Volume (vol) IEICE-118 
Number (no) no.347 
Page pp.47-52 
#Pages IEICE-6 
Date of Issue IEICE-MRIS-2018-11-29 

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