Abstract

A novel concept of the critical switching field for the magnetization reversal of a single-domain particle with small damping constant in a field at an oblique angle to the easy axis is proposed. It is derived from the locus of the magnetization plotted on the contour map of the potential. The critical field is defined as the field in which the potential at the initial point is the same as that at the saddle point of the potential. The influence of the coordinate system on the critical field is also presented.

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