Multiferroic hexagonal ferrites (h-RFeO$_3$, R=Y, Dy-Lu): an   experimental review
  Hexagonal ferrites (h-RFeO$_3$, R=Y, Dy-Lu) have recently been identified as a new family of multiferroic complex oxides.   The coexisting spontaneous electric and magnetic polarizations make h-RFeO$_3$ rare-case ferroelectric ferromagnets at low temperature.   Plus the room-temperature multiferroicity and predicted magnetoelectric effect, h-RFeO$_3$ are promising materials for multiferroic applications.   Here we review the structural, ferroelectric, magnetic, and magnetoelectric properties of h-RFeO$_3$.   The thin film growth is also discussed because it is critical in making high quality single crystalline materials for studying intrinsic properties. 
Xiaoshan Xu, Wenbin Wang
cond-mat.mtrl-sci