| 摘要 |
PURPOSE:To form a vertical magnetization film with a method having a small thermal load to a base by using a TbCo amorphous ferrimagnetic alloy film for the reproducing layer and the magnetic film with a low Curie temperature than that of the reproducing layer for the recording layer to attain excellent recording and reproducing characteristics. CONSTITUTION:Since a TbCo amorphous ferrimagnetic alloy film having a large Kerr rotary angle and a large reflection luminous amount is used as the reproducing layer, the reproducing characteristic is excellent. The recording layer made of a magnetic film having a lower Curie temperature than the reproducing layer is used in combination with the TbCo amorphous ferrimagnetic alloy film being the reproducing layer with respect to the recording characteristic, the magnetization inversion of the reproducing layer is caused near the Curie temperature of the recording layer. Thus, the excellent recording sensitivity higher than the case of a TbCo film single layer and the same degree as a TbFe single layer only is attained. Further, the film forming method with a small thermal load to the base such as the non-bias sputtering method or the vapor deposition method is used for both the reproducing layer and the recording layer. |
