Thermal magnetic recording carrier and thermal magnetic recording system

Abstract

Abstract PURPOSE: To improve the S/N ratio and the coercive force, and also to stabilize the recording information, by forming a high coercive force layer having a low curie point, by which vertical magnetization can be executed, and a low coercive force layer having a high curie point, on a base material consisting of a non- magnetic substance, and exchanging and coupling both the layers. CONSTITUTION: On a base material 1 consisting of glass, ceramics, etc., a high coercive force layer 2 having a low curie point, which can be vertically magnetized by chromium, manganese, etc., and a low coercive force layer 3 having a high curie point are formed, and both the layers are exchanged and coupled. Laser beams are focused to the high coercive force layer through an objective lens 5 and a transparent protective layer 4, it is heated around the curie point, and in this state, when information is written, it is transferred to the low coercive force layer 3. Accordingly, write power is reduced by the layer 2, and when read-out is executed by the layer 3, the S/N ratio is improved, high coercive force is obtained extending over a wide temperature range, and also the recording information is stabilized. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Shigeru Tsunashima

Bibliographic Details