Surface magnetization of a multiferroic with linear \textbf{M}-to-\textbf{P} coupling: The case of FeTiO$_{3}$

POSTER

Abstract

A multiferroic material with linear coupling between the magnetization \textbf{M} and electric polarization \textbf{P} could serve as an electric switch of magnetization. However, for applications it is necessary to couple its magnetization to a proximate ferromagnet through exchange bias at the interface. Symmetry considerations indicate that multiferroics with linear \textbf{M}-to-\textbf{P} coupling should also have a boundary magnetization, which is not directly coupled to \textbf{P} but is rather determined by the surface normal direction. This magnetization can present an obstacle for electric switching of exchange bias. Here we investigate the (001) surface magnetization of LiNbO$_{3}$-type FeTiO$_{3}$ using first-principles PAW calculations with spin-orbit coupling. The surface magnetization appears through spin canting of the surface moments. This canting is found for different surface terminations and compared with the bulk behavior.

Authors

  • James Glasbrenner

    University of Nebraska - Lincoln, University of Nebraska-Lincoln

  • Kirill Belashchenko

    University of Nebraska, Lincoln, University of Nebraska-Lincoln, Department of Physics and Astronomy, University of Nebraska-Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, University of Nebraska