The phase transition and superior multiferroic properties of (Mn, Co) co-doped BiFeO3/CoFe2O4 double-layer films

被引:19
作者
Dong, Guohua [1 ]
Tan, Guoqiang [1 ]
Luo, Yangyang [1 ]
Wang, Tong [1 ]
Ren, Huijun [1 ]
Xia, Ao [1 ]
机构
[1] Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Xian 710021, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Double-layer films; BiFeO3; Co-doping; CoFe2O4; Multiferroics; MAGNETIC-PROPERTIES; DIELECTRIC-PROPERTIES; BIFEO3; ZNO; SR; LA;
D O I
10.1016/j.jallcom.2015.09.144
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
(Mn, Co) co-doped BiFeO3/CoFe2O4 (BFMCO/CFO) double-layer films were prepared on fluorine doped tin oxide (FTO)/glass substrates by the chemical solution deposition method. The effect of (Mn, Co) co-doping on crystal structure, ferroelectric and magnetic properties of BFO/CFO double-layer films was investigated. Mn and Co co-doping on the BiFeO3 layer induced the tendency of phase transformation from rhombohedral to tetragonal. Well saturated polarization hysteresis loops were observed in BFMCO/CFO films, meanwhile a giant remanent polarization of the double-layer films (P-r similar to 123 mu C/cm(2), after compensation) is obtained. Furthermore, an enhanced ferromagnetic behavior of M-s similar to 113 emu/cm(3), M-r similar to 67 emu/cm(3) and H-c similar to 1200 Oe is observed in BFMCO/CFO films. The reduction of Fe2+ and the existence of high valence iron ions with co-doping Mn and Co were confirmed by XPS. Therefore, the difference of magnetic moment of TM2+/3+ and Fe3+ may play a more important role in the suppression of the spiral spin modulation. As a result, the introduction of (Mn, Co) and CoFe2O4 layer is an effective way to enhance the multiferroic behavior of the films. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:419 / 423
页数:5
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