Enhanced magnetization and ferrimagnetic behavior of normal spinel ZnFe2O4 thin film irradiated with femtosecond laser
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- Nakashima, S., Fujita, K., Nakao, A. et al. Appl. Phys. A (2009) 94: 83. doi:10.1007/s00339-008-4940-1
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We report on spatially selective change of magnetism from paramagnetic to ferrimagnetic-like behaviors in normal spinel ZnFe2O4 thin film under irradiation with 780 nm femtosecond laser pulses. The distribution of Zn2+ and Fe3+ ions in the irradiated region on the film surface becomes disordered because of local heating to high temperatures, and the metastable phase of ZnFe2O4 is frozen in by the rapid quenching after irradiation, resulting in the formation of the ferrimagnetic phase. The ferrimagnetic phase reverts to the paramagnetic state by annealing at 800°C. The present technique is useful for two-dimensional patterning of magnetic thin films.