Relationships between high density recording performance and particle coercivity distribution

Abstract

Most magnetic recording media are composed of magnetic crystalline particles having inherent coercivity originating from crystalline and shape anisotropies. The relationship between the statistical distribution of the particle coercivity and the high density magnetic recording characteristics was investigated. In order to estimate the width of the particle coercivity distribution (PCD) in a medium, a method in which the PCD can be obtained from M-H major and minor curves. The PCD correlates strongly with the coercivity squareness and the switching field distribution, and needs no compensation for the demagnetizing field, even in perpendicular recording media. It was shown that a sharper PCD resulted in better recording performance, particularly in perpendicular recording media.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>