| 摘要 |
PURPOSE:To obtain high S/N and stable reproduction output by consisting a low coercive force layer of a specific thin 'Permalloy(R)' film. CONSTITUTION:The low coercive force layer consists of the specific thin 'Permalloy(R)' film. Namely, the compsn. is CuvMowNixFey where v, w, x, z are in the ranges, respectively in weight %, satisfying all of the formulas 0<=v<=17, 3<=w<=7, 67<=x<=82, 10<=y<=17, 0.16<=ydivided by x<=0.22, and 98.8<=v+w+y<=100. The apparent coercive forces measured by an oscillating sample type magnetometer within the film plane is specified to >=4oersted (Oe) and <=12Oe. The apparent demagnetization curve measured by a VSM within the film plane indicates the demagnetization curve of the shape in which the saturation of magnetization is exhibited at >=60Oe and the magnetization begins to decrease at <=60Oe when the impressed magnetic field is decreased from the saturation state, then the magnetization inverts sharply near the coercive force. In addition, the film thickness is specified to >=0.3mum and <=0.7mum. The characteristics of the two- layered medium are thereby improved.
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