Correlation between the mobility of domain wall and polarization flop direction in a slanted magnetic field in the helimagnetic ferroelectrics Tb${}_{1\ensuremath{-}x}$Dy${}_{x}$MnO${}_{3}$

Rapid Communication

Correlation between the mobility of domain wall and polarization flop direction in a slanted magnetic field in the helimagnetic ferroelectrics Tb $_{1 - x}$ Dy $_{x}$ MnO $_{3}$

N. Abe, K. Taniguchi, H. Sagayama, H. Umetsu, and T. Arima

Phys. Rev. B 83, 060403(R) – Published 15 February 2011

Abstract

It has been pointed out that domain walls (DW’s) in spin-induced ferroelectrics play an important role in enhancing their magnetoelectric coupling, similar to the large magnetic permeability at around the coercive force in a ferromagnet. Here we report a systematic variation of the effect of 90 $^{°}$ DW’s on the magnetocapacitance in a series of helimagnetic multiferroic cocrystals Tb $_{1 - x}$ Dy $_{x}$ MnO $_{3}$ , which separate two regions with both the spin rotating planes and the ferroelectric polarization differing by 90 $^{°}$ . We have also found a systematic switch of the rotation directions of the ferroelectric polarization in a canted magnetic field. The results are well explained by taking account of the thickness-dependent mobility of DW’s.