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Paper Abstract and Keywords
Presentation 2022-12-08 15:55
Enhancement of magnetic relaxation constant by phase control of CoFeB/Sb2Te3
Misako Morota, Yuta Saito, Shogo Hatayama, Noriyuki Uchida (AIST) MRIS2022-23
Abstract (in Japanese) (See Japanese page) 
(in English) Chalcogenide materials such as Sb_2Te_3 and Bi_2Te_3 are known as phase-change materials, which can reversely change their phases between crystalline and amorphous by electrical stimuli, and the resultant resistivity contrast is used for nonvolatile memory (phase-change memory: PCM). In addition, these materials are a representative topological insulator, where the presence of intrinsic strong spin-orbit coupling is expected to provide highly efficient charge to spin current conversion. In this study, we focused on the relationship between the crystalline structure (atomic alignment) and the spin characteristics. The bilayer samples consisting of ferromagnetic CoFeB and topological insulator Sb_2Te_3 were fabricated with different phases of Sb_2Te_3, and the magnetic relaxation constants were investigated by ferromagnetic resonance (FMR) measurements. Enhancement of the magnetic relaxation constant was observed for crystalline Sb_2Te_3 with thinning the layer thickness, while the amorphous sample showed the independent behavior on film thickness. These results support that the phase-changeable spintronic devices can be realized.
Keyword (in Japanese) (See Japanese page) 
(in English) chalcogenide / phase-change material / topological insulator / ferromagnetic resonance / spin-pumping / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 297, MRIS2022-23, pp. 28-31, Dec. 2022.
Paper # MRIS2022-23 
Date of Issue 2022-12-01 (MRIS) 
ISSN 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 MRIS2022-23

Conference Information
Committee MRIS ITE-MMS  
Conference Date 2022-12-08 - 2022-12-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Ehime Univ. + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing and Others 
Paper Information
Registration To MRIS 
Conference Code 2022-12-MRIS-MMS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Enhancement of magnetic relaxation constant by phase control of CoFeB/Sb2Te3 
Sub Title (in English)  
Keyword(1) chalcogenide  
Keyword(2) phase-change material  
Keyword(3) topological insulator  
Keyword(4) ferromagnetic resonance  
Keyword(5) spin-pumping  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Misako Morota  
1st Author's Affiliation NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (AIST)
2nd Author's Name Yuta Saito  
2nd Author's Affiliation NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (AIST)
3rd Author's Name Shogo Hatayama  
3rd Author's Affiliation NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (AIST)
4th Author's Name Noriyuki Uchida  
4th Author's Affiliation NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (AIST)
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Speaker Author-1 
Date Time 2022-12-08 15:55:00 
Presentation Time 25 minutes 
Registration for MRIS 
Paper # MRIS2022-23 
Volume (vol) vol.122 
Number (no) no.297 
Page pp.28-31 
#Pages 4 
Date of Issue 2022-12-01 (MRIS) 

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