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Paper Abstract and Keywords
Presentation 2015-06-04 14:15
Dual free-layer spin-torque oscillator for read head application in magnetic recording
Tazumi Nagasawa, Kiwamu Kudo, Hirofumi Suto, Michinaga Yamagishi, Koichi Mizushima, Rie Sato (Toshiba) MR2015-2
Abstract (in Japanese) (See Japanese page) 
(in English) Read heads for HDDs with areal density over 2 Tb/in2 are predicted to suffer from magnetic noises that seriously reduce the signal-to-noise (S/N) ratio. To overcome this problem, a novel read head composed of a spin-torque oscillator (STO) has recently been proposed. For the implementation of an STO read head, large-amplitude microwave emissions with narrow spectral linewidth are required. In this article, we experimentally study the oscillation properties of an STO with a dual free layer and its response to a pulsed magnetic field. This type of STO shows large-amplitude oscillations with narrow linewidth because of synchronized magnetization motions in the two free layers. In addition, this STO has a thinner structure than the conventional one. This feature is preferable for an STO read head, in which the STO needs to be placed inside a narrow shield-to-shield gap to obtain high spatial resolution.
Keyword (in Japanese) (See Japanese page) 
(in English) Spin-Torque Oscillator / STO / Magnetic Recording / Read Head / Dual Free Layer / / /  
Reference Info. IEICE Tech. Rep., vol. 115, June 2015.
Paper #  
Date of Issue 2015-05-28 (MR) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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 MR2015-2

Conference Information
Committee MRIS ITE-MMS  
Conference Date 2015-06-04 - 2015-06-05 
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 2015-06-MR-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Dual free-layer spin-torque oscillator for read head application in magnetic recording 
Sub Title (in English)  
Keyword(1) Spin-Torque Oscillator  
Keyword(2) STO  
Keyword(3) Magnetic Recording  
Keyword(4) Read Head  
Keyword(5) Dual Free Layer  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Tazumi Nagasawa  
1st Author's Affiliation Toshiba Corporation (Toshiba)
2nd Author's Name Kiwamu Kudo  
2nd Author's Affiliation Toshiba Corporation (Toshiba)
3rd Author's Name Hirofumi Suto  
3rd Author's Affiliation Toshiba Corporation (Toshiba)
4th Author's Name Michinaga Yamagishi  
4th Author's Affiliation Toshiba Corporation (Toshiba)
5th Author's Name Koichi Mizushima  
5th Author's Affiliation Toshiba Corporation (Toshiba)
6th Author's Name Rie Sato  
6th Author's Affiliation Toshiba Corporation (Toshiba)
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Speaker Author-1 
Date Time 2015-06-04 14:15:00 
Presentation Time 25 minutes 
Registration for MRIS 
Paper # MR2015-2 
Volume (vol) vol.115 
Number (no) no.71 
Page pp.7-12 
#Pages 6 
Date of Issue 2015-05-28 (MR) 

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