Optically Induced Magnetization Switching in NiCo₂O₄ Thin Films Using Ultrafast Lasers

All-optical magnetization control has recently been garnering considerable attention to realize next-generation ultrafast magnetic information devices. Here, employing a magneto-optical Kerr effect (MOKE) microscope, we observed the laser-induced switching of ferrimagnetic oxide NiCo2O4 (NCO) epitaxial thin films with perpendicular anisotropy, where sample was pumped by 1030 nm laser pulses, and domain images were acquired via MOKE microscope white light emitting diode. Laser pulses irradiated NCO film at various temperatures from 300 400 K while altering parameters pulse interval, fluency, number in absence external field. We accumulative all-optical helicity-dependent above 380 K. Our observation facilitates realization using lasers without applying