TEMPERATURE-DEPENDENCE OF COERCIVITY IN CO-BASED LONGITUDINAL THIN-FILM RECORDING MEDIA

The coercivity of Co-based (CoCrTa and CoCrPt), disk media was found t o depend on temperature. The thinner the film, the smaller the switchi ng unit (KuV), and the larger dH(c)/H(c)dT. dH(c)/HcdT for CoCrTa (400 Angstrom) on different underlayers or intermediate layers is generall y larger than that of CoCrPt (400 Angstrom) on different underlayers o r intermediate layers. The temperature dependence of coercivity in Co- based disk media is caused by the temperature dependence of crystallin e anisotropy of Co and small switching unit of the media. (C) 1997 Ame rican Institute of Physics.