| 摘要 |
PURPOSE:To obtain a high magnetic permeability film of the ground, which causes no increase of a head recording current nor drop of a reproducing output by providing a vertical magnetized film on a high magnetic permeability material having a specified specific magnetic permeability. CONSTITUTION:A Co80Zr9.5Mo10.5 thin film is prepared by a sputter method on a glass disk, and also a Co80Cr20 thin film is provided by a sputter method. A magnetic permeability which does not cause a deterioration of a reproducing output, an increase of I90 and an increase of noise is set to a range of 100-150, from a relation of a magnitude e1k of a reproducing output in case when recording and reproducing are executed to the two layer film by using a ring head, a current value I90 for giving an output of 90% of the maximum output, a magnitude of a DC noise, and a magnetic permeability of a Co-Zr-Mo thin film. |
