Variation of Coercivity of Magnetic Materials with Driving Field

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Abstract
The use of a low‐frequency sinusoidal driving field to measure the B–H characteristics of magnetic materials is now a well‐known technique. An increase in amplitude of this field is generally accompanied by an increase in coercivity. Ferrite cores, tape cores, and thin magnetic films have been investigated—all of which exhibit similar characteristics. Both coercivity and saturation field are shown to depend upon the rate of rise of the applied magnetic field, thus enabling a mathematical analysis to be made which is in good agreement with the experimental results. Pulse techniques are also used in the case of anisotropic, thin magnetic films to confirm the view that changes of magnetic state are by domain‐wall motion.