Creating magnetic optics using Ion Beam Sputtering and Magnetotaxial Anisotropy, for faster/ more energy-efficient data-center communications

https://phys.org/news/2025-12-nanoscale-magnetic-mazes-center-communications.html

"enables depositing cerium-substituted yttrium iron magnetic garnet films onto substrates with different lattice mismatches (opposite strain types). with both films still exhibiting strong perpendicular magnetic anisotropy...  film's magnetic direction primarily determined by magnetotaxial anisotropy (growth-related effect from how atoms arrange during deposition) which is >10X more important than substrate strain... magnetic domains orders of magnitude smaller, Faraday rotation 1.6X better, low saturation field"