Multiferroic and in-plane magnetoelectric coupling properties of BiFeO₃ nano-films with substitution of rare earth ions La³⁺ and Nd³⁺

详细信息    查看全文

• 作者：Kaixin GUO (郭凯鑫)^a ; Rongfen ZHANG (张荣芬)^a ; Tengpeng HE (何腾鹏)^a ; Handong KONG (孔汉东)^b ; Chaoyong DENG (邓朝勇)^a ; ^{cydeng@gzu.edu.cn}
• 关键词：bismuth ferrite ; substitution ; rare earth ions ; ferroelectricity ; dielectricity ; ferromagnetism ; magnetoelectric coupling
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：34
• 期：12
• 页码：1228-1234
• 全文大小：2908 K
• 卷排序：34

文摘

Single-phase multiferroic BiFeO3 and Bi0.9(La/Nd)0.1FeO3 (doped with rare earth ions La3+ and Nd3+) films grown on (111)-Pt/Ti/SiO2/Si substrate were prepared via sol-gel method and a subsequent rapid thermal process. The phase composition, microstructure, ferroelectric, dielectric, ferromagnetic properties were investigated, and meanwhile, the in-plane magnetoelectric (ME) coupling effects of the films were reported and studied for the first time in this work. Structural characterization by X-ray diffraction and scanning electron microscopy showed that both BiFeO3 and Bi0.9(La/Nd)0.1FeO3 exhabited a rhombohedral structure with (111) preferred orientation. The results of the physical properties indicated that the introduction of rare earth ions improved significantly the polarization, magnetization and dielectric properties than the undoped BiFeO3 crystals, and it enhanced effectively the in-plane ME coupling (the ME coupling coefficient αE increased from 0.13 in the pure BiFeO3 to 0.21 in Bi0.9La0.1FeO3 and 0.34 V/(Oe·cm) in Bi0.9Nd0.1FeO3). The mechanism of these phenomena was investigated systematically.