Relaxation time and thermal stability in magneto-optical recording media

In this study, the time dependence of the magnetization process in amorphou s TbFeCo thin films and (TbFeCo/Pt) multilayers is studied. By assuming a G aussian distribution of relaxation times for magnetic aftereffect, the non- Arrhenius behavior of the magnetization decay is found in almost all of sam ples. From a fitting of experimental data one can determine the mean value of relaxation time tau (0) and also its width Delta tau (0). The multilayer s of TbFeCo/Pt show a high stability compared to single layers of TbFeCo wi th also a small activation volume.