Soft Magnetic Composites Fesial/Mos2 with High Magnetic Permeability and Low Magnetic Loss

Abstract

Choosing Two-Dimensional (2-D) layered semiconductor material MoS 2 as the insulator, FeSiAl/MoS 2 composites were synthesized by mixing MoS 2 and aerosolized FeSiAl in a certain mass ratio. The structure, morphology and magnetic properties of FeSiAl/MoS 2 composites were measured by XRD, SEM, XPS, VSM and B-H analyzer. The SEM results show that high-speed ball milling breaks the binding of weak Van der Waals force between MoS 2 layers, and nano-thick MoS 2 micron flakes wrapped on the FeSiAl spherical surface. The results of magnetic properties show that not only the FeSiAl/MoS 2 composite achieves a higher magnetic permeability due to the thin MoS 2 flakes clinging to the FeSiAl particle surface, but also the eddy current between the metallic particles is blocked, resulting in a great reduction of eddy current loss. The permeability results show that the relaxation frequency of FeSiAl/MoS 2 composites exceeds 1MHz, which is suitable for application at high frequency. The magnetic loss of FeSiAl/1wt%MoS 2 composite reaches 454kWm -3 under the condition of f=0.1MHz and B=0.1T, which is about three quarters of that of FeSiAl soft magnetic composites for commercial application.

Keywords: FeSiAl/MoS2, Two dimensional layered MoS2, Magnetic loss, Soft magnetic properties