Effect of magnetic properties in FeSi soft magnetic composites by low melting glass powder as adhesive and insulating agent

Abstract

FeSi/1wt% glass soft magnetic composites are prepared by mechanically mixing, compacting, and annealing, their morphology is examined by SEM, and their magnetic properties are measured by MPMS and B-H analyzer. The morphology of SEM shows that when the annealing temperature is higher than the melting point of the glass, the glass particles between the FeSi balls are deformed into flakes. The sample has higher saturation magnetization and lower power loss. The magnetic permeability and mechanical strength of the sample increase with the increase of annealing temperature, but the best power loss characteristics emerge at annealing temperature of 400 °C.

Vortex-based soft magnetic composite with ultrastable permeability up to gigahertz frequencies

“… a – c Frequency dependence of real permeability ( ), imaginary permeability ( ) and quality factor (Q) of different composites. d , e Comparison of M s , μ i , and maximal stable frequency between vortex-based soft magnetic composites in this work and literature results 6 – 10 , 13 , 14 , 28 – 56 . Ferrites materials are colored by grey because of their high sintering temperature and low Curie temperature.…”

“…However, current soft magnetic composites use metallic magnetic particles with a multidomain structure 6 – 11 , which still leads to permeability decline above megahertz frequency as a result of domain wall resonance 12 . The coercivity also deteriorates (~800 A/m) compared with bulk materials ( 80 A/m) 9 , 13 , 14 , due to the internal stress introduced during cold-pressing process. Moreover, traditional soft magnetic composites crack easily due to the weak interlock capacity of spherical particles and bonding strength of the metal/coating interface.…”

Effect of Pressure on Crystal Structure and Phonon Density of States of FeSi

“…The tuning of magnetic properties within a narrow band gap semiconductor and exploring its non-Fermi liquid state due to impurities hold fundamental interest within spintronics, nonvolatile memory devices, and quantum many-body physics. Furthermore, FeSi finds utility in creating soft magnetic composite materials , essential in commercial high-frequency and high-power electromagnetic applications and motors. Recent experiments and theoretical observations underscore topological Fermi arcs and bulk chiral Fermions within monosilicides, − sparking considerable interest in materials with isostructural properties akin to FeSi and their corresponding microstructures.…”