X. Z. Lu, X. G. Gong, H. J. Xiang
Multiferroics with the coexistence of ferroelectric and ferromagnetic orders are ideal candidates for magnetoelectric applications. Unfortunately, only very few ferroelectric-ferromagnetic multiferroics (with low magnetic critical temperature) were discovered. Here we perform first principles calculations to investigate the effects of the epitaxial strain on the properties of BiMnO3 films grown along the pseudocubic [001] direction. Unlike the ground state with the centrosymmetric C2/c space group in bulk, we reveal that the tensile epitaxial strain stabilizes the ferromagnetic and ferroelectric Cc state with a large polarization (P > 80 {\mu}C/cm2) and high Curie temperature (estimated Tc ~ 395 K). More importantly, there is a novel intrinsic magnetoelectric coupling in the multiferroic Cc state with the easy magnetization axis controllable by the external electric field.
View original:
http://arxiv.org/abs/1301.3660
No comments:
Post a Comment