Quadratic Magnetoelectric Effect and Magnetic Field Induced Pyroelectric Effect in Multiferroic BaMnF4

TL;DR

This study investigates the quadratic magnetoelectric and magnetically induced pyroelectric effects in BaMnF4, revealing symmetry distortions and temperature-dependent polarization changes through experimental and theoretical analysis.

Contribution

It provides new insights into the magnetoelectric behavior and symmetry considerations of BaMnF4 under high magnetic fields.

Findings

Quadratic magnetoelectric effect tensor components indicate triclinic distortion.

Magnetically induced polarization shows anomalous temperature dependence.

Spin orientation deflects by 9 degrees from the b-axis.

Abstract

The experimental studies of magnetoelectric effects in pulse magnetic field up to 250 kOe and their theoretical analysis on the basis of magnetic symmetry consideration are carried out. It is shown that the nonvanishing components of quadratic magnetoelectric effect tensor corresponding to the electric polarization along b- and c-axes point out the triclinic distortion of the crystal symmetry. Anomalous temperature dependence of magnetically induced polarization Pa(Hb) testifies to the magnetically induced pyroelectric effect. The torque curves measurements show the deflection of the spin orientation from the b-axis at 9 degrees of arc.