Simulation of Thermomagnetic Recording Process Using MFM Method : Effect of Field Gradient(Magneto-optical and Hybrid Recording)

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Thermomagnetic recording process was simulated for Tb_c (Fe_<72>Co_<22>)_<100-c> media by using Huth's model modified to be applied to the magnetic field modulation (MFM) recording method. In the case of the recording with 0.4 μm-diameter laser spot and a single pulsed uniform recording magnetic field and TbFeCo media, the recorded mark length became much longer than designed one calculated by a linear velocity and a field pulse width, when the designed mark length was less than 100 nm. The mark elongation was more significant for the recording on a TM-rich medium (c = 17.6). When the mark length was shorter than 40 nm, marks were not formed on a RE-rich medium (c = 21.7) due to the collapse of domains. By introducing Gaussian profile of recording magnetic field with a maximum gradient of 10 Oe/nm together with the laser spot profile, the elongation of recorded marks was remarkably reduced. Furthermore, the stability of the marks shorter than 40 nm on the media c = 21.7 was found to be improved. From the analysis of the effective field acting on the domain wall, it was found that the effect of the field gradient |∂H_c/∂x|+|∂H_<etx>/∂x|at the wall stable position was crucial to reduce the mark elongation as well as to improve stability of very short marks.
社団法人日本磁気学会の論文
2004-11-01