Approaches to reduce temperature coefficient of coercivity of high-densityrecording media

The magnitude of temperature coefficient of coercivity (/dH(c)/dT/) of high -density recording media increases with decreasing media thickness and dilu tion of the Co in the interior of the grains by Cr or other substitutions. A reduction in magnetic anisotropy with temperature increases /dH(c)/dT/ wh ereas a decrease in magnetization compensates for such change, Some approac hes such as better Cr segregation, or utilizing a magnetic bilayer with the initial layer having a lower Curie temperature can be used to minimize /dH (c)/dT/.