Visualization of magnetic domains on power Mn-Zn ferrites using longitudinal Kerr effect

(Received 26 May 1992, revised 3 November 1992, accepted 3 March 1993)

Abstract
After a historical recall about the study of magnetic domains on polycrystalline soft power ferrites, this paper deals with the use of the longitudinal and transverse Kerr effect on these materials. The experimental requirements and the test bench are described. The first results are obtained with DC excitation. The interpretation of the images reveals that the magnetization varies according to two distinct mechanisms : the wall movement and the rotation of the magnetization.