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Paper Abstract and Keywords
Presentation 2021-03-03 10:45
Magnetic domain of highly-Bi-doped sputtered garnet films for a random number generator
Izumi Nakamura, Shutaro Yoshida, Shinichiro Mito (NITTC) CPM2020-61 Link to ES Tech. Rep. Archives: CPM2020-61
Abstract (in Japanese) (See Japanese page) 
(in English) Physical random number generator is necessary to generate true random numbers. However, a physical random number generator, which can generate random number easily and quickly, is still under consideration. A magnetic domain patterns of magneto-optical materials is a promising noise source of physical random number generator. We focus on bismuth-substituted yttrium iron garnet (Bi:YIG) films prepared by the sputtering method as the material to be used. The Bi:YIG films were prepared by the sputtering method on a alkali-free glass substrate, and post annealing. A large crystal grain was grown with annealing temperature of 530°C for more than 4h. The 1 Gbit random number sequence that is generated from the magnetic domain pattern of the fabricated film passed randomness tests (NIST SP800-22) except FFT. In addition, the Bi;YIG films which is prepared on a gadolinium gallium garnet (GGG) (111) were also investigated. The films on GGG substrate was relatively smoother than that of on an alkali-free grass. The random number based on the domain patterns were passed NIST SP800-22 except FFT, Runs and Overlapping template. The random number sequences that generated from the domain patterns of the sputtering garnet films were passed the part of randomness test. The test score will be improved by optimizing the film formation process and random number generation process.
Keyword (in Japanese) (See Japanese page) 
(in English) magnetic garnet / magneto-optical effect / sputtering method / physical Random Number Generator / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 408, CPM2020-61, pp. 22-25, March 2021.
Paper # CPM2020-61 
Date of Issue 2021-02-24 (CPM) 
ISSN 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 CPM2020-61 Link to ES Tech. Rep. Archives: CPM2020-61

Conference Information
Committee CPM  
Conference Date 2021-03-03 - 2021-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CPM 
Conference Code 2021-03-CPM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Magnetic domain of highly-Bi-doped sputtered garnet films for a random number generator 
Sub Title (in English)  
Keyword(1) magnetic garnet  
Keyword(2) magneto-optical effect  
Keyword(3) sputtering method  
Keyword(4) physical Random Number Generator  
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1st Author's Name Izumi Nakamura  
1st Author's Affiliation National Institute of Technology ,Tokyo College (NITTC)
2nd Author's Name Shutaro Yoshida  
2nd Author's Affiliation National Institute of Technology ,Tokyo College (NITTC)
3rd Author's Name Shinichiro Mito  
3rd Author's Affiliation National Institute of Technology ,Tokyo College (NITTC)
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Speaker Author-1 
Date Time 2021-03-03 10:45:00 
Presentation Time 15 minutes 
Registration for CPM 
Paper # CPM2020-61 
Volume (vol) vol.120 
Number (no) no.408 
Page pp.22-25 
#Pages
Date of Issue 2021-02-24 (CPM) 


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