| 摘要 |
PURPOSE:To perform sufficient vertical magnetic recording by using positively individual layers different in magnetic resistivity for vertical magnetization and performing vertical magnetic recording and reproducing by a ring core head using a metal. CONSTITUTION:When a Co-Cr-Nb thin film and a Co-Cr-Ta thin film are formed by sputtering, they are formed in a double-layered structure consisting of a crystal layer 2 of small particle size having a low magnetic resistivity near a base 1 and a crystal layer 3 of large particle size having a high magnetic resistivity, especially, in the vertical direction on the layer 2. Lines of the magnetic flux emitted from a ring core head 4 using a metal pierce the crystal layer 3 of large particle size and reach the crystal layer 2 of small particle size, and the magnetic flux goes in the plane direction in the crystal layer 2 of small particle size having a low magnetic resistivity and a high permeability and is absorbed quickly in the magnetic pole part of the ring core head 4 to magnetize vertically the crystal layer 3 of large particle size. Thus, since the magnetic loop formed with the magnetic flux is horseshoe as shown by arrows and the magnetic flux pierces sharply the crystal layer of large particle size in a prescribed vertical magnetic recording position, the crystal layer 3 of large particle size is magnetized vertically with great residual magnetization. |
