Magnetocapacitive effects in solid solutions Yb xMn 1-xS

The paper describes the materials on the basis of solid solutions Yb xMn 1-xS, which could be potentially used as sensors, sensor devices, read-write information. Mechanisms of magneto-electric effects were considered and the mechanism of magnetoelectric coupling at room temperatures in the absence of spin order was clarified. The optimal conditions for the occurrence of magnetoelectric effect on temperature and concentration are found. The results of measurements of dielectric permeability and dielectric loss tangent for several frequencies in the temperature range 80 K xMn 1-xS, x = 0.05 and x = 0.1, without a field and in magnetic field 0.8 T were presented. The magnetic permeability of solid solutions Yb xMn 1-xS from the measurements of inductance of the solenoid with sample was determined. The magnetic permeability by cooling the sample in zero magnetic field and in the field of 0.25 T was measured. The shift of maximum in the temperature dependence of magnetic permeability in the vicinity of transition to the magnetically ordered state to high temperature versus frequency was found. Quality factor decreasing when heated and a maximum at a frequency of 10 kHz, and a minimum at a frequency of 50 kHz in the vicinity of Neel temperature was established. Relaxation time depends on the temperature according to the power law in the paramagnetic region. The observed anomalies are explained by the dynamic of the electron orbital magnetic moments. Magnetocapacitance effect in Yb xMn 1-xS with x = 0.05 and x = 0.1 at temperatures above room temperature was found. Changes in sign of magnetocapacitance in the vicinity of 200 K for x = 0.05 was determined. Magnetocapacitive effects are explained in the model of the orbital ordering of electrons. Change in sign of magnetocapacitance on temperature is attributed to the formation of magnetic and orbital ordering at different temperatures.