Quadratic magnetoelectric effect and the role of the magnetocaloric effect in the magnetoelectric properties of multiferroic BaMnF4
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- Zvezdin, A.K., Vorob’ev, G.P., Kadomsteva, A.M. et al. J. Exp. Theor. Phys. (2009) 109: 221. doi:10.1134/S1063776109080068
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The magnetoelectric effects in BaMnF4 in magnetic fields up to 250 kOe are experimentally studied and theoretically analyzed using the magnetic symmetry of the crystal. The presence of quadratic magnetoelectric effect tensor components that correspond to the electric polarization components along the b and c axes indicates triclinic distortions in the monoclinic symmetry of the crystal. The anomalous dependence of the magnetic field-induced polarization (Pa(Hb)) can be related to the pyroelectric effect caused by magnetocaloric heating of the crystal. The measured torque curves point to a 9° deviation of the spin orientation from the b axis.