| 摘要 |
PURPOSE:To reduce magnetic resistance and to improve magnetic efficiency by forming the peripheral edge part of an area for coupling a magnetic york magnetically with a substrate like an irregular shape to expand the peripheral length of the magnetic coupling area. CONSTITUTION:A contact hole 2 for coupling the magnetic york magnetically with the substrate 1 has an irregular shape by forming three projected parts 3 or forming front and back projection parts 3a as shown in the figures. Since the peripheral edge part is formed like a recessed shape so that the peripheral length of the contact hole is expanded, the peripheral length of a step part is also expanded, so that magnetic resistance is reduced and the magnetic efficiency can be extremely improved. |
