| 摘要 |
PURPOSE:To execute the overwrite of information by providing the magnetic layer of the high magnetic permeability having a vertical anisotropy, on a protective film. CONSTITUTION:A magnetic layer 5 consists of a high magnetic permeability material, and constituted by bringing it to perpendicular magnetization against the film surface by controlling a film forming condition and the thickness of a film. When an external magnetic field does not exist, the magnetization of a magnetic domain 8 of a recording layer 3 becomes a reflux structure, and a magnetic pole is not generated in the outside, but when the external magnetic field 9 of magnitude for distributing the magnetizing direction to a prescribed direction is applied, the magnetic domain 8 is oriented and a polarization is generated on the upper and lower faces, and when a magnetic domain 10 therein is taken notice of, a loop-shaped magnetic flux distribution 11 as indicated with a short dash line is generated, and as a result, the horizontal component of a magnetic flux of the external magnetic field 9 and the horizontal component of a magnetic flux generated from the magnetic domain 10 are offset mutually, and on the other hand, the vertical components intensity each other, and as a result, the vertical component of the magnetic field applied to the recording layer 3 is increased. In such a manner, since a high frequency magnetic field such as a ring head can be used, overwrite can be executed. |
