AN ANALYSIS OF MAGNETIC VISCOSITY IN MO FILMS .1. EXPERIMENTAL

Time dependence measurements have been made on two Tb/Fe multilayer fi lms possessing square and rounded hysteresis loops. Both films exhibit a non-linear variation of M with ln t. Experimental curves of dM/dt a gainst reduced magnetisation have been compared with curves derived fr om a 2D theoretical model. These curves indicate that a two coercivity model may be applied to reversal in these films, and the nature of do main growth during reversal. MFM images of domains have been obtained and show that domain size correlates with the nature of reversal.