| 摘要 |
PURPOSE:To substantially obviate a decrease in a perpendicular magnetic component and to decrease eddy current loss by using a multi-layered structural body consisting of thin magnetic films and nonmagnetic films having an insulating characteristic as a magnetic pole and disposing the magnetic pole in such a manner that a horizontal magnetic field is perpendicular to the multi-layered films of the multi-layered structural body. CONSTITUTION:The magnetic pole consisting of the multi-layered structure is disposed to a perpendicularly magnetized medium 5. This multi-layered structural body is laminated with plural layers of the soft magnetic films 1 and the nonmagnetic layers 2. The multi-layered films of this multi-layered structural body face the perpendicularly magnetized medium 5. A coil 3 is wound around the magnetic pole consisting of the multi-layered structural body. The soft magnetic films 1 are formed of amorphous Zr-Co and the nonmagnetic layers of SiO2 by a sputtering method. The horizontal magnetic field 4 is impressed to the multi-layered film planes of unidirectional multi-layered structural body so that the film planes are held perpendicular to the horizontal magnetic field. A self-demagnetizing field acts in the direction perpendicular to the film plane and the inclination of a spin in the direction HM when a DC magnetic field HM is applied to the films is suppressed and, therefore, the perpendicular magnetic field component is hardly decreased. Since the magnetic films are thin, the eddy current loss is decreased. |
