| 摘要 |
<p>A photothermomagnetic recording film manufacturing method in which a perpendicular-magnetization film of a Bi-substituted rare earth iron garnet is formed on a substrate by sputtering a target consisting of an oxide which contains at least Bi atoms, Fe atoms, and rare earth atoms, and then depositing the atoms constituting the oxide which have been released from the target by the sputtering on a substrate which is maintained at a temperature of at most 700oC. Thus it is possible to obtain a perpendicular-magnetization film of Bi-substituted rare earth iron garnet which has a large Bi-substitution quantity (x), and consequently has an extremely large Faraday rotation angle υ¿F?, a sufficiently large coercive force Hc, as well as a sufficiently small absorption coefficient α. Accordingly it is possible to manufacture a photothermomagnetic recording film which has extremely good photothermomagnetic recording characteristics. Moreover, since it is possible to select the quality of the substrate on which the photothermomagnetic recording film is to be formed, the method is extremely advantageous from the manufacturing point of view.</p> |
