THERMOMAGNETIC OPTICAL RECORDING METHOD.

摘要

Unidirectionally magnetised soft film is used with an axis of magnetisation normal to its surface and defining varying energy regions moves required domains by laser irradiation and temp. gradients. A 2.0 microns thick (TmBi)3(FeGa)5012 soft film is formed on a garnet substrate, and recessed regions (21) 500 Angstroms deep are defined in it by 6 micron square stepped sides (22). An information bubble (b) is moved between stable points (A,B) within a recessed region or transferred to another track to give a cue bubble (c.b.) by continuous laser irradiation.