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.