Structure and Magnetic Properties of Submicron Fe-B Spherical Particles and Particle Chains

Abstract

This paper describes study on the structure and magnetic properties of submicron Fe-B amorphous spherical particles and particle chains synthesized by liquid phase reduction method in order to realize new noise suppression sheet (NSS) toward 5G (3.5 GHz/4.7 GHz) applications. In case of Fe-B amorphous spherical particles, their peak frequencies originating from magnetic resonance can be observed and their values were about 3-4 GHz. On the other hand, the peak frequency values of Fe-B amorphous particle chains were a little lower than those of Fe-B amorphous spherical particles, but their peak values in imaginary part of the complex permeability (µ ”) at 3.5 GHz/4.7 GHz were almost as same as those of Fe-B amorphous spherical particles. Also, the intrinsic permeability of Fe-B amorphous particle chains were 2-4 times higher than those of Fe-B amorphous spherical particles owing to decrease in the demagnetizing field. Therefore, these results suggest that submicron Fe-B amorphous particle chains are one of the candidates as not only NSS for 5G applications.