Exchange coupling coefficient and domain wall mobility of (Dy,Tb)FeCo magneto-optical films

Abstract

The magnetic properties and recording characteristics of (Dy,Tb)Fr,Co films are dependent upon the anisotropy dispersion of rare earth constituents and the exchange integral between rare earth and transition metal sub networks. The exchange coupling coefficient lambda and the domain wall mobility mu(eff) are found to be interrelated by both measurements and calculations. The higher the lambda or the lower the mu(eff), the higher bias field that is required for magneto-optical recording. The temperature independent lambda is demonstrated to be an important parameter in the assessment of magnetic properties and recording characteristics of sperimagnetic films. (C) 1997 American Institute of Physics.