Abstract
The review is devoted to the analysis of physical processes occurring at different stages of production and application of nanocrystalline soft magnetic materials based on Fe–Si–B doped with various chemical elements. The temperature dependences of the kinematic viscosity showed that above a critical temperature, the viscosity of multicomponent melts at the cooling stage does not coincide with the viscosity at the heating stage. Above the critical temperature, the structure of the melt is more homogeneous, the amorphous precursor from such a melt has greater plasticity and enthalpy of crystallization and, after nanocrystallization, the material has a higher permeability. The most effective inhibitor elements are insoluble in α-Fe and form a smoothed peak of heat release during crystallization. On the other hand, the finest nanograins and the highest permeability are achieved at a narrow high-temperature peak of heat release. The cluster magnetic structure of a nanocrystalline material is the cause of magnetic inhomogeneity, which affects the shape of the magnetic hysteresis loop and core losses.
Highlights
Nanocrystalline soft magnetic materials were discovered by Yoshizawa, Yamauchi andOguma in 1986 [1,2]
The review is devoted to the analysis of physical processes occurring at different stages of production and application of nanocrystalline soft magnetic materials based on Fe–Si–B doped with various chemical elements
The critical temperature is associated with the rearrangement of the melt structure
Summary
Nanocrystalline soft magnetic materials were discovered by Yoshizawa, Yamauchi and. Oguma in 1986 [1,2]. In the model of random magnetic anisotropy [13], the material consists of structural regions (in our case, grains) with size d, having the same exchange constant A, magnetic crystallographic anisotropy constant K1 , and saturation magnetization Ms ; the direction of the easy magnetization axes has random distribution. The effective magnetic anisotropy constant hKi in the exchange correlation region (Lex ) can be written in the form [14]: K hK i = √ 1 , N (2). Ferromagnetic clusters have the size Lex , the effective magnetic anisotropy constant hKi, and the easiest magnetization axes, indicated by double arrows. With a decrease in the effective magnetic anisotropy constant hKi, the size of ferromagnetic clusters Lex will increase. The section “Multicomponent melts” analyzes the effect of temperature and chemical composition of melts on the structure of an amorphous precursor and nanocrystalline alloy. The last section compares the magnetic properties of various nanocrystalline soft magnetic materials and analyzes their application in power electronics
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