Visualization of Magnetic Field Distribution at Soft Magnetic Composite

Abstract

Soft magnetic composite (SMC), as one of soft magnetic materials, is being used increasingly in electromagnetic devices due to its magnetic isotropy, high electrical resistivity and easy formation. This paper presents the magnetic field distribution at the compressing surface of SMC by means of magneto-optical imaging technique. It is found that the flux density is non-uniform inside the sample, even within one particle region. Although there are interactions between neighbouring particles, the magnetized sample behaves as a collection of individual magnetized particles rather than as a uniform and continuous magnetic substance.