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

http://repository.vnu.edu.vn/handle/VNU_123/32582

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.

Title:	Rare Earth-Doped BiFeO3 Thin Films: Relationship between Structural and Magnetic Properties
Authors:	Ngo, Thu Huong Lee, Seunghun Atabaev, Timur Sh.
Keywords:	SUBSTITUTION Rare Earth-(RE-) doped BiFeO3 (BFO) thin films pulsed laser deposition technique
Issue Date:	2015
Publisher:	HINDAWI PUBLISHING CORP, 315 MADISON AVE 3RD FLR, STE 3070, NEW YORK, NY 10017 USA
Citation:	ISIKNOWLEDGE
Abstract:	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.
Description:	ADVANCES IN CONDENSED MATTER PHYSICS Article Number: 371802 Published: 2015 ; TNS05801
URI:	http://repository.vnu.edu.vn/handle/VNU_123/32582
ISSN:	1687-8108
Appears in Collections:	Bài báo của ĐHQGHN trong Web of Science