Magnetization of the cation-substituted Co(x)Mn(₁ - x)S sulfides upon cooling in zero and 100 Oe magnetic fields at the temperatures 4-300 K has been measured. Permittivity of these materials at frequencies from 1 to 100 kHz in magnetic and dc electric fields in the 100-300 K temperature range has been determined. Change in the dielectric permittivity under an external magnetic field is found to have a maximum in the temperature ranges of T₁ ~ (110-120 K) and T₂ ~ (230-250 K). Formation of spontaneous magnetic moment and the rise of magnetic susceptibility are revealed at the same temperatures in the Co(x)Mn(₁- x)S solid solutions. Features of the magnetoelectric properties of the sulfides have been explained by orbital ordering.
The prehistory of the dielectric properties of bismuth – neodymium ferrite – garnet films on a Gd3Ga5O12 (111) substrate cooled in an electric and magnetic field were established. The dynamic characteristics of the electric polarization are studied at large times when the electric field is turned on and off. The influence of a magnetic field on the residual polarization was found. The dependence of the electric polarization on the electric field in a magnetic field is determined. Experimental data are explained in the Debye model.
In a solid solution of HoxMn1-xS, the influence of the prehistory of a sample cooled without a field and in a magnetic field on the magnetic characteristics is investigated. An increase in the inductance of a coil with a sample cooled in a magnetic field is found. The type of current carriers, the temperature of the change of the sign of the current carriers, the concentration and mobility from the Hall constant are determined. The results are explained in the model of spin and orbital-charge glass formation.
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