Eddy-current effects in rectangular ferromagnetic rods

Expressions are obtained for the eddy-current distribution and the resulting loss angle for an infinitely long ferromagnetic rod of rectangular cross-section containing a number of domains magnetized parallel and anti-parallel to the axis of the rod and separated by domain walls running perpendicular to the long edge of the cross-section. Results are expressed in terms of the ratio of the lengths of the sides of the rod and the number of walls. Two cases are considered ¿the low-frequency limit in which the domain walls remain plane and the more general case in which the wall becomes bowed because of eddy-current screening effects.