| 摘要 |
PROBLEM TO BE SOLVED: To reduce the thickness of the film over the entire part of a magnetic layer having an axis of easy magnetization in an intra-surface direction and to improve C/N by disposing a nonmagnetic layer or the magnetic layer between a reproducing layer (R layer) having perpendicular magnetic anisotropy and a recording layer (M layer) and transferring magnetization by magnetostatic bonding without an exchange bonding of the R layer and the M layer. SOLUTION: The nonmagnetic cut layer 4a having a film thickness of 1 to 30Åis disposed between the R layer 3 and the M layer 4. (The cut layer having the axis of easy magnetization in the intra-surface direction is otherwise disposed in all the operating temp. range). As a result, the exchange bonding strength between the R layer 3 and the M layer 4 is controlled to the desired value and the magnetization direction is transferred to the R layer 3 with the static magnetic bonding by the leak magnetic fluxes of the M layer 4. A recording assisting layer (W layer) 6 is merely necessitated to transfer the magnetization direction by the exchange bonding only to the M layer 4 and therefore, the reduction of the film thickness of the W layer 6 is made possible and further the reduction of the film thickness of an initialization layer 8 is made possible, by which the thickness over the entire part of the magnetic layer is reduced. The thermal conductivity and heat radiatability are improved by the reduction in the film thickness, the sensitivity of information recording and erasing is improved and the stable execution of overwriting is made possible.
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