RECORDING AND REPRODUCING METHOD

摘要

PURPOSE:To enable high recording and reproducing even in high-density recording and to easily enable the simultaneous copying of information. CONSTITUTION:A magnetic material which generates diaferromagnetic- ferromagnetic transition is locally heated in the state of maintaining the magnetic material in a temp. range where the transition arises. The information is recorded by generating ferromagnetism or diaferromagnetism in the heated part and thereafter, the information is reproduced by detecting the magnetization quantity of the part or the state quantity of a magnetization change or magnetization direction, etc.