This work describes experimental study by a direct and indirect method of magnetocaloric properties of Ni-based alloys: Ni 93.8 V 6.2 , Ni 89.5 Al 10.5 , Ni 72.5 Cu 27.8 , which are promising materials for self adjusting magnetic hyperthermia. It has been demonstrated that the temperature of the maximum magnetocaloric effect determined by these methods can differ significantly, which is of critical importance for self-adjusting hyperthermia.

The magnetic and magneto-optical properties of (Со40Fe40B20)x(SiO2)100x nanocomposites with x = 30–72 at % are studied. The results reveal the inhomogeneous structure of the nanocomposites, which exhibit both large granules and small particles that make independent contributions of different nature to the magnetic properties of the materials. Specific features of the coercive force near the percolation threshold indicate superferromagnetic ordering in the composites at low temperatures.

The magnetic and magnetocaloric characteristics of Ni50Mn35In15 Heusler alloy are studied in low and high applied magnetic field. At a magnetic field of 14 T, the adiabatic temperature change ΔT ad measured by the sample extraction technique near the martensitic transformation (≈315 K) is as large as 11 K. This value is an order of magnitude larger than the corresponding change measured at 1.6 T. The observed giant values of the magnetocaloric effect could be related to the suppression of antiferromagnetic correlations.

A correlation between the magnetic part of the entropy and magnetoresistance has been studied using measurements of the resistivity, magnetoresistance, and magnetization of the Ni 50 Mn 35 In 12 Si 3 and Ni 50 Mn 35 In 11 Si 4 Heusler alloys. It has been shown that although the variations of the entropy and the magnetoresistance are observed to be maximal within the same temperature intervals in the vicinity of the first-order and second-order phase transitions, there is no universal correlation between these effects.

Heisenberg spin glass with random competing anisotropy is studied, where longitudinal (L), transverse (T), mixed (LT) of spin glass, Q-phase with non-zero quadrupole parameter of order were been experimentally observed. Consecutive transitions into spin glass have been observed.

The Hall effect and transverse magnetoresistance (MR) in amorphous ferromagnetic alloys Fe100−xBx with x = 12.2–18.1 at % have been studied at 77–300 K. It was found that the ordinary and extraordinary Hall coefficients, Ro and Rs, are equal to Ro = (20–70) × 10−12 W cm G−1 and Rs = (6–9) × 10−10 W cm G−1, depend on temperature (d Ro/dT < 0, dRs/dT < 0) and display a non-monotonic dependence on composition, with extrema at x = 14.4 at %. It was established that for amorphous and crystalline alloys the typical relation between Rs and the resistivity is not fulfilled in amorphous alloys Fe-B. In the case of a magnetic field perpendicular to the ribbon plane, the transverse MR is positive up to 8–10 kOe. The most pronounced positive effect exists in alloys with 13.1 at % at ∼ 180 K. Possible reasons for the unusual behaviour of Rs and the MR are discussed.