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Thermomagnetic Writing in Magnetic Garnet Films

The authors have succeeded in the development of rare-earth iron garnet (RIG) films whose magnetic coercivity is high enough to be used for Curie point writing. Specimens were prepared by means of liquid-phase epitaxial growth, where the lattice constant mismatch was set to be ∼0.04 Å. Sm and Er were used as rare-earth components to increase the coercivity through the enhancement of uniaxial anisotropy, while some amount of Bi was substitutes for them to strengthen the Faraday rotation. Optical and magnetic properties as well as thermomagnetic recording characteristics in the visible region have extensively been investigated. The writing threshold powers of a 0.55 µm thick film were found to be 51, 32 and 24 mW for wavelengths λ=514.5, 488.0 and 457.9 nm respectively, under laser irradiation for 10 µs with a spot radius of 2.5 µm. Analytical discussions are made based on the heat conduction in the recording medium.