Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations
Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations
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DOI：
10.1063/1.4905343
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发表时间：
2015-01-05
影响因子：
4
通讯作者：
Grundmann, Marius
中科院分区：
文献类型：
--
作者：
Lorenz, Michael;Wagner, Gerald;Grundmann, Marius
多铁性（BaTiO 3-BiFeO 3）x15多层异质结构在300 K时表现出高达24 V/cm.Oe的高磁电（ME）系数α（ME）。该值远高于单相BiFeO 3参比膜的值（α（ME）= 4.2V/cm.Oe）。我们发现明确的相关性ME系数与增加氧分压在生长过程中。ME耦合对于较低密度的氧空位相关缺陷是最高的。详细的扫描透射电子显微镜和选定区域的电子衍射显微结构的调查，在300 K揭示的钛酸钡单层，这是一个额外的相关缺陷结构的多层的氧八面体的反相旋转。(C)2015 AIP Publishing LLC.
Multiferroic (BaTiO3-BiFeO3) x 15 multilayer heterostructures show high magnetoelectric (ME) coefficients alpha(ME) up to 24 V/cm.Oe at 300 K. This value is much higher than that of a single-phase BiFeO3 reference film (alpha(ME) = 4.2 V/cm.Oe). We found clear correlation of ME coefficients with increasing oxygen partial pressure during growth. ME coupling is highest for lower density of oxygen vacancy-related defects. Detailed scanning transmission electron microscopy and selected area electron diffraction microstructural investigations at 300 K revealed antiphase rotations of the oxygen octahedra in the BaTiO3 single layers, which are an additional correlated defect structure of the multilayers. (C) 2015 AIP Publishing LLC.