A dynamical magnetic field accompanying the motion of ferroelectric domain walls

12 Apr 2019  ·  Juraschek Dominik M., Meier Quintin N., Trassin Morgan, Trolier-McKinstry Susan E., Degen Christian, Spaldin Nicola A. ·

The recently proposed dynamical multiferroic effect describes the generation of magnetization from temporally varying electric polarization. Here, we show that the effect can lead to a magnetic field at moving ferroelectric domain walls, where the rearrangement of ions corresponds to a rotation of ferroelectric polarization in time... We develop an expression for the dynamical magnetic field, and calculate the relevant parameters for the example of 90$^\circ$ and 180$^\circ$ domain walls in BaTiO$_3$ using a combination of density functional theory and phenomenological modeling. We find that the magnetic field reaches the order of several $\mu$T at the center of the wall, and we propose two experiments to measure the effect with nitrogen-vacancy center magnetometry. read more

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Materials Science