Low-temperature magnetic and electric properties in hexagonal multiferroic compound YbMnO3 were studied. The Mn3+ spin moments order at TN = 85 K and reoriented around 43.5 K, leading to the magnetic phase transition from B2(P63cm) → A2(P63cm). The concomitant ferroelectric polarization is observed and explained microscopically by the destruction of initial symmetric relationship of the polarization between the upper and lower half of the magnetic unit cell. The asymmetry of the polarization vs temperature curves under opposite poling voltage revealed the pinning effect of the defects on the electrical polarization.
We studied the temperature effect on magnetic and electrical properties in bulk SrFe 12 O 19 prepared by conventional ceramic technique. The jumping behavior of magnetization has been observed under the zero-fieldcooling mode, but disappeared under the field-cooled cooling mode. The spin moment of iron ions reorients below 50 K leading to the magnetic structure changes. Magnetic parameters, saturation magnetization (Ms) and coercivity field (Hc), show opposite tendency with temperature throughout the measuring range, which is mainly ascribed to the Fe 3? ions situated at 4f 2 and 2b sites. The curves of electrical polarization P vs temperature T under different external magnetic field indicate the existence of ferroelectricity and magnetoelectric coupling effect at low temperature, and the transition temperature T P is about 120 K.
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