VERTICAL MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a vertical magnetic recording medium that has a superior low noise characteristic and a stable recording magnetization and that is suitable for super high density magnetic recording, by reducing the irregularly structured magnetic domain formed on the medium surface or micronizing the structure of the magnetic domain. SOLUTION: In a magnetization-magnetic field curve in the direction vertical to the film surface of a medium, in which the first quadrant has a positive magnetization and field and in which the second quadrant has a positive magnetization and a negative field; assuming the field strength is dHc at the intersection between a tangent line passing through the coercive force -He point of the second quadrant of the curve and a straight line drawn parallelly to the field axis from the saturation magnetization Ms of the curve; the medium is used in which the coercive force -Hc of the second quadrant and the saturation magnetization dHc satisfy the relational expression of 0<(Hc+dHc)/Hc<=1.6.