2005 Volume 5 Issue 2 Pages 61-64
Thermal stability of written bits with different linear densities on [MgO/FePt] n/MgO 4-nm/SiO2 4-nm/Fe-Ta-C 200-nm/Glass perpendicular media with two different multilayer structures has been investigated by Magnetic Force Microscope (MFM) equipped with an in-situ heating system capable up to about 200°C. For Disk with n =2 (Disk A), only a few reversed domains appear in the center area of 10 kfci bits at 200°C, which is due to the strong demagnetization field at this linear density, while higher density bits have no observable degradation even at 200°C indicating good thermal stability of this disk. On the other hand, for Disk with n = 3 (Disk B), much more reversed domains are observed inside the 10 kfci bits at 200°C. The observed MFM signal decay is correlated with the temperature dependent magnetic properties.
