Abstract
A method for the analysis of rotary permanent-magnet bias-field devices for magneto-optic recording applications is presented. The first part of the method entails a three-dimensional field analysis to determine the magnet dimensions that render a bias field of desired strength and uniformity across the medium. The second part of the method entails an analysis of the rotary dynamics of the magnet to determine the parameters that render a desired response time for field reversal. The theory is demonstrated via application to a practical device.