| 摘要 |
PURPOSE:To enable the independent control of the intensity of an exchange bond and coercive force by providing a 3rd magnetic layer which is a perpendicularly magnetized film having the magnetic wall energy smaller than the magnetic wall energy of 1st and 2nd magnetic layers between said magnetic layers. CONSTITUTION:The 3rd magnetic layer which is the perpendicularly magnetized film having the magnetic wall energy relatively smaller than the magnetic wall energy of the 1st magnetic layer and 2nd magnetic layer of the exchange bond two-layered films which allow overwriting by modulation of a laser power is provided between the 1st and 2nd magnetic layers. The magnitude of the magnetic wall energy at the boundary and eventually the intensity of the exchange bond acting between the 1st and 2nd magnetic layers are, therefore, controlled by changing the film thickness of the 3rd magnetic layer even if the kinds of the rare earths of the 1st and 2nd magnetic layers are not changed. The independent control of the intensity of the exchange bond and the coercive force is thereby enabled. |
