Thermomagnetic recording in the TbFe films and thermal stability of signals

Abstract

At present the amorphous rare earth-transition metal (RE-TM) films can be considEred, in terms of their properties, the most appropriate media for reversible optical recording of information.1 These films eibit perpendicular magnetic anisotropy within a wide range of compo sitions. Changing the concentration of elements in the films allows to alter both physical and working characteristics of the material, Amorphous state of the films (that is, the absence of polycrystalline ;triicture) allows one to achieve low noise levels in magnetooptical reproduction of signals. In recent years the processes of pulse thermomagnetic recording in RE-TM amorphous films have been intensively studied. 38 However experimental data available in the literature are rather insufficient and often inconsistent. Thus, for example, the dependence of the basic working parameters of magnetooptical carriers (sensitivity,minimum pit size, etc.) on the chemical composition of the magnetic layer is still not clearly understood. Further studies are required to investigate the correlation of pits geometry parameters and pits distortions with magnetic propertices of the carrier as well as with the condi- tions of recording and the subseqent carrier storage. The present paper cliscribes the investigation of the processes of thermomagnetic recording in amorphous TbFe magnetooptical films as WRU ac; the processes of pulse thermal erasure of signals. The results of the experiments on signals degradation during recording media storage at high temperatures ar reported.