ИСТИНА

Amorphous microwires are of great interest from the point of view of practical applications. Due to the amorphous structure, the magnetoelastic anisotropy and magnetic anisotropy of the shape are considered as the main factors determining their hysteresis magnetic properties. Microwires have a number of effects that are used in various areas. These effects include magnetic bistability used in coding, logic, and memory systems, magnetoimpedance effect used in high-performance sensors shape memory and magnetocaloric effects for magneto-mechanical actuators [1-3]. The proximity of several microwires to each other can lead to the appearance of a magnetostatic connection between them. This fact can significantly affect the magnetic response of the arrays of wires, since their properties will be determined not only by the contributions of individual wires, but also by their interaction. In this case, their total magnetic response will depend on the magnetic field created by each element. In this work, we considered the arrays of microwires, which consisted of elements of different composition (Fe-, CoFe-based), diameter and differed in their distribution in the composite. The process of magnetization reversal of the bundle of microwires was compared with the process of magnetization reversal of a single wire. Experimental data were obtained using a VSM LakeShore 7404 vibration magnetometer. Hysteresis loops were obtained for samples in different magnetic field ranges (maximum field - 500 Oe, 5 kOe, 16 kOe) and for different orientations of the magnetic field relative to the sample axis (0, 15 ˚, 30˚, 45˚, 60˚, 75˚, 90˚). Based on the data obtained for each sample, the dependences of the coercive force on the orientation of the microwires relative to the magnetic field were obtained. The experimental data were compared with the theoretical dependence for the case of the magnetization reversal of a single-domain ellipsoidal particle [4]. From an analysis of the results of the magnetization reversal processes in various samples, it was concluded that there are various magnetostatic bonds in the samples Fe- and Co-based. It is interesting to note that in the process of magnetization reversal of the arrays of microwires, a bistable behavior was not observed, in contrast to a single microwire. It is assumed that the study of the influence of the configuration of a bundle of microwires on its magnetic properties will allow the composite to be compiled in accordance with predetermined parameters. [1] I. Baraban et al., The role of structural properties on magnetic characteristics of glass-coated microwires , Journal of Magnetism and Magnetic Materials 459, 61–65, (2018) [2] V. Rodionova et al., Tailoring of Magnetic Properties of Magnetostatically-Coupled Glass-Covered Magnetic Microwires, Supercond Nov Magn, 24, 541–547, (2011) [3] V. Rodionova et al., Spectral properties of electromotive force induced by periodic magnetization reversal of arrays of coupled magnetic glass-covered microwires, J. Appl. Phys., 07E735, 111, (2012) [4] G.S. Krinchik, Physics of magnetic phenomena. M., Publishing House of Moscow. University, 1976