ИСТИНА

Amorphous magnetic materials have attracted huge research interest since the 60s-70s of the last century and do not lose their relevance. The widest prospects for practical use, as well as the fundamental significance of understanding of processes taking place in amorphous materials, give reason to the research interest in this area. A number of effects in amorphous materials is now well understood. However, many problems, for example, the distribution of the magnetic permeability over the volume of material, remain unsolved. Cylindrical symmetry of amorphous magnetic microwires allows to make simplifications in equations describing their magnetic state. Maxwell’s equations solution for uniformly magnetized medium under the low amplitude AC magnetic field allows one to determine the relations between the magnetic permeability of the material and the effective permeability of the sample. The effective magnetic permeability can be obtained from the measurements of the amplitude of magnetic flux density and its phase shift in reference to the magnetizing field. Numerical calculations of the coupling equation gives real and imaginary parts of the magnetic permeability of the material. The applicability is limited by the accuracy of the determination of the relations between the real and imaginary parts of the permeability. In case if the samples are non-uniform over the cross section, it is possible to evaluate the dependence of magnetic properties on radius of the wire. It is known that frequency determines the thickness of the skin layer. Thus, changing the frequency it is possible to change the sample part, which contributes to the magnetic properties. Frequency sweep can provide the information about the magnetic properties of the wire layer by layer what is necessary for reconstruction of the permeability dependence on the radius of the wire. Such evaluation can also help to control the structure and phase composition of the wire.