Effect of the surface crystallographic orientation and thickness of Fe-3 wt%Si single crystals on magnetic losses in rotating magnetic fields

The response of magnetic losses to rotation-induced magnetization reversal in single-crystal Fe-3 wt%Si disks is studied as a function of the disk thickness and magnetic induction. It is shown that the loss power varies nonmonotonically with disk thickness d, exhibiting a minimum at d = 0.15 mm. The crystallographic orientation of the disk surface significantly influences the amount of the losses. The variation of the losses is discussed with regard to the effect a rotating magnetic field has on the domain structure.