Effect of rare-earth ion doping on the multiferroic properties of BiFeO3 thin films grown epitaxially on SrTiO3(1 0 0)
Effect of rare-earth ion doping on the multiferroic properties of BiFeO3 thin films grown epitaxially on SrTiO3(1 0 0)
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DOI：
10.1088/0022-3727/46/17/175006
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
V. Lazenka;M. Lorenz;H. Modarresi;K. Brachwitz;P. Schwinkendorf;T. Böntgen;J. Vanacken;M. Ziese
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文献类型：
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作者：
V. Lazenka;M. Lorenz;H. Modarresi;K. Brachwitz;P. Schwinkendorf;T. Böntgen;J. Vanacken;M. Ziese
采用脉冲激光沉积法在SrTiO 3（1 0 0）衬底上制备了高质量的外延Bi 1-xRExFeO 3（RE=La、Nd、Gd; x = 0、0.05、0.15）薄膜。X射线衍射和RBS沟道谱表明，薄膜为单相钙钛矿结构，无其它相，织构沿沿着[1 0 0]方向择优取向。磁化强度与温度和磁场的关系表明，薄膜表现出弱铁磁性。在所研究的稀土掺杂离子中，Bi 3+被Gd 3+取代最显著地增强了铁磁性能。La 3+的取代使表面形态变得平滑，这对于不同的潜在应用很重要。未掺杂和掺杂的薄膜在piezoresponse力显微镜中显示出清晰的铁电响应，从而证实了它们的多铁性。掺杂被发现，以促进优先铁电极化的域。
High-quality epitaxial Bi1−xRExFeO3 (RE=La, Nd, Gd; x = 0, 0.05, 0.15) thin films were prepared on SrTiO3(1 0 0) substrates using pulsed laser deposition. X-ray diffraction and RBS-channelling spectroscopy showed that the films are single-phase perovskite, free of additional phases and textured with preferential orientation along the [1 0 0] direction. The dependences of magnetization on temperature and field showed that the films exhibit weak ferromagnetic properties. Among the studied rare-earth doping ions, Bi3+ substitution by Gd3+ most considerably enhanced the ferromagnetic properties. Substitution by La3+ smoothened out the surface morphology, which is important for different potential applications. Both undoped and doped films showed clear ferroelectric response in piezoresponse force microscopy, thus confirming their multiferroic nature. The doping was found to promote a preferential ferroelectric poling of the domains.