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Advances in Condensed Matter Physics
Volume 2015 (2015), Article ID 371802, 5 pages
Research Article

Rare Earth-Doped BiFeO3 Thin Films: Relationship between Structural and Magnetic Properties

1Nanomagnetism Laboratory, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
2Faculty of Physics, Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
3Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
4Department of Physics, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan

Received 18 March 2015; Accepted 19 August 2015

Academic Editor: David Huber

Copyright © 2015 Ngo Thu Huong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Rare Earth- (RE-) doped BiFeO3 (BFO) thin films were grown on LaAlO3 substrates by using pulsed laser deposition technique. All of BFO films doped with 10% of RE show a single phase of rhombohedral structure. The saturated magnetization in the Ho- and Sm-doped films is much larger than those reported in literature and was observed at a quite low field as of 0.2 T. As for Pr- and Nd-doped BFO films, Fe2+ amount is not dominant; thus, ferromagnetism is not favored. As the RE concentration goes up to 20%, all compounds have drastically gone through a structural transition. The RE-doped BFO films have changed from rhombohedral to either pure orthorhombic phase (for Ho, Sm), or a mixed phase of orthorhombic and tetragonal (for Pr, Nd), or pure tetragonal (for Eu). We observed magnetic properties of RE-doped BFO films have significantly changed. While 20% Ho/Sm-doped BFO films have ferromagnetism degraded in comparison with the 10% doping case, the 20% Pr/Nd-doped BFO thin films, whose structure is a mixed phase, have magnetic ordering improved due to the fact that the Fe2+ amount has become greater. It seems that one can control the magnetic properties of BFO films by using appropriate RE dopants and concentrations.