Growth diagram and magnetic properties of hexagonal LuFe2O4 thin films

Authors

Wenbin Wang, University of Tennessee
Zheng Gai, Oak Ridge National Laboratory
Miaofang Chi, Oak Ridge National Laboratory
Jason D. Fowlkes, Oak Ridge National Laboratory
Jieyu Yi, University of Tennessee
Leyi Zhu, Argonne National Laboratory
Xuemei Cheng, Bryn Mawr College
David J. Keavney, Argonne National Laboratory
Paul C. Snijders, Oak Ridge National Laboratory
Thomas Z. Ward, Oak Ridge National Laboratory
Jian Shen, Fudan University, ShanghaiFollow
Xiaoshan Xu, University of Nebraska-LincolnFollow

Date of this Version

2012

Document Type

Article

Citation

PHYSICAL REVIEW B 85, 155411 (2012)

Comments

Used by permission.

Abstract

Agrowth diagram of Lu-Fe-O compounds on MgO (111) substrates using pulsed laser deposition is constructed based on extensive growth experiments. The LuFe₂O₄ phase can only be grown in a small range of temperature and O₂ 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 the LuFe₂O₄ film and is explained in terms of the effect of the impurity hexagonal LuFeO₃ (h-LuFeO₃) phase and structural defects.