VERTICAL MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To obtain a high reproducing output by forming the lower layer contg. at least cobalt and chromium on a base, further forming the upper layer consisting of cobalt and chromium on the lower layer to obtain the titled vertical magnetic recording medium and regulating the coercive force of the lower layer in the in-plane direction to 10-220Oe and the squareness ratio of both the upper and the lower layer in the in-plane direction to >=0.25. CONSTITUTION:The lower layer consisting of at least cobalt and chromium is formed on a base and the upper layer consisting of cobalt and chromium is formed on the lower layer to obtain a vertical magnetic recording medium. The coercive force of the lower layer in the in-plane direction is regulated to 10-220Oe and the squareness ratio in the hysteresis characteristic of both the upper and the lower layer in the in-plane direction is adjusted to >=0.25. Since the magnetic flux emitted from a magnetic head is passed through the upper layer having high coercive force and absorbed rapidly and sharply by the magnetic pole of the magnetic head, strong residual magnetization is generated in the upper layer and hence a high reproducing output can be realized.