Abstract
Abstract This work studies the relationship between the structural characteristics and the final magnetic properties of two different iron-based materials: one basic Soft Magnetic Material (SMM) and a Soft Magnetic Composite (SMC). The micrometric size of the starting powder, the pure iron composition of the core and the presence of a phosphate isolating shell in the composite sample were revealed by powder X-ray diffraction, Laser Diffraction and Fourier Transformed Infrared Spectroscopy respectively. Moreover, Scanning Electron Microscopy confirms the range of sizes of the powder samples and their non-perfect spherical shape. Magnetic and Impedance Spectroscopy measurements evidence the effects that the isolating shell has on the effective magnetic permeability and the relaxation frequency at which magnetic losses appear. Results obtained are of great interest from a technological point of view because the frequency range at which each material can effectively operate is measured. Furthermore, different structural aspects (such as particle size or the presence of an isolating shell) are related with the final functional properties. Besides, these results can help in the design of new soft magnets with lower magnetic losses over a wide range of frequencies.
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