WELCOME!

We are studying thin film fabrication processes, such as the metal organic decomposition (MOD) method and laser assisted MOD method. The MOD method is promising for high quality oxide magnetic films. One of the most significant result in our laboratory is bismuth-substituted iron garnet films, which are promising materials for MO applications, spintronic devices, microwave devices, etc. We are also developing characterization techniques utilizing magneto-optical effects, such as MO imaging technique, MO spectroscopy, etc. Recently, we have started a research on MO diffractive deep neural network device.

What's new!

RESEARCH

RECENT PUBLICATIONS

  1. Monte Carlo Optimization for Real-Time Magnetic Domain Learning in Magneto-Optical Diffractive Deep Neural Networks
     F. Z. Chafi, T. Matsuya, H. Sakaguchi, K. Watanabe, T. Ishibashi,
    J. Euro. Opt. Soc., 2026. (accepted) New!
  2. Magnetic characterization of grain boundaries in electrical steel using the magneto-optical Faraday effect incremental permeability and principal component analysis,
    Shurui ZHANG, Yves Armand TENE DEFFO, Andre SALGADO, Takayuki ISHIBASHI, Benjamin DUCHARNE and Tetsuya UCHIMOTO,
    Int. J. Applied Electromag. Mech., 2026. (accepted) New!
  3. Reconfigurable Magneto-Optical Diffractive Neural Network with Enhanced Optical Phase Modulation,
    H. Sakaguchi, K. Watanabe, J. Ikeda, S. Sumi, H. Awano, F. Z. Chafi, T. Ishibashi,
    Scientific Reports, 8920, 2026. DOI: 10.1038/s41598-026-42193-9 New!
  4. Circularly Polarized Light-Induced Magnetization Reversal in Bi,Ga-Substituted Magnetic Garnet Films,
     R. Asatani, S. Suzuki, A. Hata, M. A. A. Masud, H. Sakaguchi, S. Isogami and T. Ishibashi, J. Magn. Soc. Jpn., 50(2), pp.30-34, 2026. New!
  5. TeO2–BaO–Bi2O3 tellurite optical glasses II. - Linear and non-linear optical and magneto-optical properties,
    J. Hrabovsky, J.R. Love, L. Strizik, T. Ishibashi, S. Zollner, M. Veis,
    Optical Materials, 169, 117572, 2026. New!
  6. Simultaneous measurement of longitudinal and transverse Kerr images using a polarization camera,
    Takayuki Ishibashi, Shigehiro Asai, Itsuo Wakamatsu, Hotaka Sakaguchi and Tomoyasu Taniyama,
    J. Phys.: Conf. Series, 3161, 012040, 2026. DOI 10.1088/1742-6596/3161/1/012040 New!
  7. Development of online learning technique for magneto-optical diffractive deep neural networks,
    Hotaka Sakaguchi, Riku Oya, Satoshi Sumi, Hiroyuki Awano, Hirofumi Nonaka, Fatima Zahra Chafi, Takayuki Ishibashi,
    J. Phys.: Conf. Series, 3161, 012042, 2026.DOI 10.1088/1742-6596/3161/1/012042 New!
  8. Improving magneto-optical properties of Nd0.5Bi2.5Fe5O12 thin films by introducing Bi3Fe5O12 underlayer,
    J. Zhang, K. Watanabe, F. Z. Chafi, M. Nishikawa, H. Asada, M. Kawahara, M. Veis, and T. Ishibashi,
    J. Magn. Soc. Jpn., 50(1), pp.23-29, 2026. https://doi.org/10.3379/msjmag.2601R004 New!
  9. Angular momentum compensation in Eu0.5Bi2.5Fe5-xGaxO12 thin films prepared by metal-organic decomposition method,
     M. A. A. Masud, W. Asano, K. Watanabe, M. Kawahara, F. Z. Chafi, M. Nishikawa, and T. Ishibashi,
    IEEE Transactions on Magnetics, Vol.61, No.7, pp.1-11, July 2025. DOI: 10.1109/TMAG.2025.3575340
  10. 磁気光学回折型ディープニューラルネットワークデバイス、光ニューラルネットワーク最前線、
    石橋隆幸、Optronics、No.520、pp.171-175、2025年4月
  11. 磁気光学回折型ニューラルネットワークデバイス、
    石橋隆幸、日本磁気学会誌「まぐね」Vol.19, No.6, pp.299-304, 2024
  12. Structural and optical properties of hexagonal and orthorhombic YMnO3 thin films prepared by metal-organic decomposition method,
    Kanata Watanabe1, Hotaka Sakaguchi1, Fatima Zahra Chafi1, Masami Nishikawa1, Hironori Asada2, Martin Veis3, and Takayuki Ishibashi1, 1Nagaoka Univ. of Tech., 2Yamaguchi Univ., 3Charles Univ.,
    Jpn. J. Appl. Phys. 63, 11SP16, 2024
  13. Thermomagnetic recording of highly Bi-substituted iron garnet film using scanning laser for spatial light modulation,
    Hotaka Sakaguchi1, Takuma Honma1, Jian Zhang1, Satoshi Sumi2, Hiroyuki Awano2, Hirofumi Nonaka3, Fatima Zahra Chafi1, and Takayuki Ishibashi1, 1Nagaoka Univ. of Tech., 2Toyota Tech. Inst., 3Aichi Institute of Technology,
    Jpn. J. Appl. Phys., 63, 10SP02, 2024
  14. Bi,Ga置換Euガーネットの室温における磁化及び角運動量補償組成,
    朝野 航, Md Abdullah Al Masud, 西 敬生, 大島 大輝, 加藤 剛志, 李 基鎮, 河原 正美, Fatima Zahra Chafi, 西川 雅美, 石橋 隆幸,
    Journal of the Magnetics Society of Japan, 2024 年 8 巻 2 号 p. 84-89, https://doi.org/10.20819/msjtmsj.24TR817 (Accepted on 2024/4/26)
    （日本磁気学会内山賞受賞）
  15. Pure TeO2 glass: Influence of synthesis conditions on linear and non-linear optical, magneto-optical and structural properties,
     J. Hrabovsky, N. S. Tagiara, J. Mistrik, L. Strizik, P. Rysanek, V. Kopecky Jr., J. Kozlik, J. Orava, S. Wang, T. Ishibashi, E.I. Kamitsos, M. Veis,
    Journal of Alloys and Compounds, 997, 174788, 2024,https://doi.org/10.1016/j.jallcom.2024.174788
  16. Magneto-Optical Spectroscopy of Epitaxial CoxFe3-xO4 (001) Thin Films,
    S. Wang, H. Onoda, J. Harbovsky, H. Yanagihara, J. Inoue, M. Veis, T. Ishibashi,
    Journal of the Magnetics Society of Japan, Volume 47, Issue 6, 2023, pp.137-143
    （日本磁気学会論文賞受賞）
  17. Development of fabrication techniques for magneto-optical diffractive deep neural networks,
    Hotaka Sakaguchi, Takumi Fujita, Jian Zhang, Satoshi Sumi, Hiroyuki Awano, Hirofumi Nonaka,and Takayuki Ishibashi,
    IEEE Trans. Mag., 59, pp.1-4, (2023), DOI:10.1109/TMAG.2023.3281842
  18. Boron-induced magneto-optical Kerr spectra and dielectric tensors in ferrimagnetic (Mn4N)B antiperovskite thin films,
    Hotaka Sakaguchi, Shinji Isogami, Makoto Niimi and Takayuki Ishibashi,
    J. Phys. D: Appl. Phys., 56 (2023) 365002

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