Abstract
Thermomagnetic recording process for various TbFeCo films has been simulated in the case of the irradiation of the laser with the spot diameter of 1.0, 0.6, and 0.2μm by using Huth's equation modified by assuming the domain wall of 20 nm. In the case of TM-rich film, it is found that the domain having a diameter of 60 nm was formed at temperature below Curie point because of the large demagnetizing energy which resulted from the large magnetization. On the other hand, the large temperature gradient made it difficult to stabilize the small size domain in RE-rich film. The smallest size of written domain was 40nm, which was observed for the films with compensation composition irradiated by 0.2μm laser spot.
