A micromagnetic model of metal-evaporated tape

A 3D micromagnetic model of metal-evaporated tape has been developed to rep resent the granular nature of the film. The model simulates the columnar st ructure of ME tape by fitting together columns of spherical grains whose ra dii have been generated from a log-normal distribution. It is demonstrated that for high exchange coupling there is a high degree of co-operative reve rsal in the columns; whereas for little or no exchange coupling reversal is by incoherent rotation. For high exchange coupling co-operative reversal c auses regions of flux closure due to strong demagnetising fields, (C) 1999 Elsevier Science B.V. All rights reserved.