SIMULATION OF THERMOMAGNETIC RECORDING IN RARE EARTH-TRANSITION MAGNETIC FILM USING VERY SMALL LASER SPOT

抄録

  Thermomagnetic recording process has been simulated for transition metal(TM)-rich and rare earth(RE)-rich TbFeCo films assuming heam spot size of 1 and 0.1 micron, where very simple temperature dependence is assumed for the wall energy. For the TM-rich Tb₁₈(Fe₇₈Co₂₂)₈₂ film, domains smaller than 0.1 micron can be written owing to the large stray field. On the other hand, for the RE-rich Tb_25.6(Fe₇₈Co₂₂)_74.4 film, small domains cannot be written due to the large effective field which, originating from the wall energy and its spatial gradient, forces to shrink the domain.