Growth diagram and magnetic properties of hexagonal LuFe$_2$O$_4$ thin   films
  A growth diagram of Lu-Fe-O compounds on MgO (111) substrates using pulsed laser deposition is constructed based on extensive growth experiments.   The LuFe$_2$O$_4$ phase can only be grown in a small range of temperature and O$_2$ pressure conditions.   An understanding of the growth mechanism of Lu-Fe-O compound films is offered in terms of the thermochemistry at the surface.   Superparamagnetism is observed in LuFe$_2$O$_4$ film and is explained in terms of the effect of the impurity h-LuFeO$_3$ phase and structural defects . 
Wenbin Wang, Zheng Gai, Miaofang Chi, Jason D. Fowlkes, Jieyu Yi, Leyi   Zhu, Xuemei Cheng, David J. Keavney, Paul C. Snijde...
cond-mat.mtrl-sci cond-mat.str-el