A collaborative team led by TI-FRIS Fellow Taichi Goto, associate professor at Tohoku University's Electrical Communication Research Institute (RIEC), has developed a new way to create magnetic optical materials, one that removes a long-standing design bottleneck and could boost the speed and efficiency of data-center communications. Using an ion beam sputtering technique, the team fabricated nanoscale, labyrinth-like magnetic patterns that form reliably regardless of the underlying substrate strain.

Figure: Polarization microscopy reveals nanoscale labyrinth magnetic domain patterns (~219 nm width), suitable for data center optical devices. ©Taichi Goto

Details of the study were published in the journal ACS Applied Optical Materials on November 25, 2025.

Publication Details:

Title: Magnetotaxial Perpendicular Magnetic Anisotropy and Enhanced Faraday Rotation in Ion Beam Sputtered Cerium-Substituted Yttrium Iron Garnet

Authors: Taichi Goto, Takumi Koguchi, Yuki Yoshihara, Hibiki Miyashita, Kanta Mori, Toshiaki Watanabe, Allison C. Kaczmarek, Pang Boey Lim, Mitsuteru Inoue, Caroline A. Ross, Kazushi Ishiyama

Journal: ACS Applied Optical Materials

DOI: 10.1021/acsaom.5c00496

https://doi.org/10.1021/acsaom.5c00496