Multiferroic phase diagram of Y partially substituted Dy1−xYxMnO3

Abstract

The effect of nonmagnetic Y partial substitution at the Dy site in Dy1−xYxMnO3 up to x=0.2 on magnetism, specific heat, and ferroelectricity is investigated, which resulted in a preliminary multiferroic phase diagram. It is revealed that the Y partial substitution suppresses the Dy-spin ordering point (TDy) and ferroelectric ordering point (TFE) but enhances the Mn-spin ordering point (TN). The interaction between the spins of Dy and Mn is remarkably affected by Y substitution. The measured electrical polarization depends on the Y substitution in a complex way because the ferroelectricity is sensitive to the interaction between the spins of Dy and Mn.