| Presentation | 2021-03-03 Magnetic domain of highly-Bi-doped sputtered garnet films for a random number generator Izumi Nakamura, Shutaro Yoshida, Shinichiro Mito, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | magnetic garnet / magneto-optical effect / sputtering method / physical Random Number Generator |
| Paper # | CPM2020-61 |
| Date of Issue | 2021-02-24 (CPM) |
| Conference Information | |
| Committee | CPM |
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| Conference Date | 2021/3/3(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Mayumi Takeyama(Kitami Inst. of Tech.) |
| Vice Chair | Yuichi Nakamura(Toyohashi Univ. of Tech.) |
| Secretary | Yuichi Nakamura(Hirosaki Univ.) |
| Assistant | Yasuo Kimura(Tokyo Univ. of Tech.) / Tomoaki Terasako(Ehime Univ.) / Fumihiko Hirose(Yamagata Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Component Parts and Materials |
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| Language | JPN |
| 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 |
| 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) |
| Date | 2021-03-03 |
| Paper # | CPM2020-61 |
| Volume (vol) | vol.120 |
| Number (no) | CPM-408 |
| Page | pp.pp.22-25(CPM), |
| #Pages | 4 |
| Date of Issue | 2021-02-24 (CPM) |