METHOD FOR RECORDING OR RECORDING AND ERASING INFORMATION

摘要

PURPOSE:To obtain a method which improves recording and erasing sensitivity and provides large reproduction output by executing either of recording or erasing in accordance with a change in crystal structure past a molten state. CONSTITUTION:A recording material is formed by using an element of group Vb as an essential component and alloying the same with Sb or Bi and one kind among other specific metals so that the m.p. thereof is adjusted to about 200-800 deg.C. The compsn. of the alloy is determined that the concn. of the shell electrons of the alloy is kept in a 3-3.5 range. An alloy film 2 is then formed on a substrate 1 for vapor deposition by using a 2-element resistance heating vapor deposition device with either of Sb or Bi as a vapor deposition source and the other element to be alloyed as a vapor deposition source. Information is recorded in such constitution by heating the crystal phase in the initial state locally to the m.p. or above to attain the molten state, then changing the crystal phase by quick cooling to vary the reflectivity. The crystal of the initial state is restored and the information is erased if this part is heated to the highest possible temp. below the m.p. and is then cooled. The large reproduction output is thereby obtd.