Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics
Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics
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DOI：
10.1063/1.4793511
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发表时间：
2013-02
影响因子：
3.2
通讯作者：
G. Venkataiah;E. Wada;H. Taniguchi;M. Itoh;T. Taniyama
中科院分区：
文献类型：
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作者：
G. Venkataiah;E. Wada;H. Taniguchi;M. Itoh;T. Taniyama
研究了Fe/BaTiO3 （BTO）薄膜的磁各向异性和矫顽力（HC）在室温下的电场控制。BTO（001）表面的偏光显微镜和x射线衍射分析显示出明显的两个不同区域；一个具有a1， a2和c结构域，由180°和90°结构域边界（db）分隔（区域1），另一个具有a1结构域，由180°db分隔（区域2）。区域1的Fe膜表现出复杂的磁各向异性，净磁易轴在BTO的[100]和[110]方向之间，而区域2的磁各向异性表现出两重对称，易轴沿[100]方向。在外加电场（±10 kV/cm）下，区域1的Fe膜的磁易轴被切换到BTO的[110]方向，而区域2的磁易轴不受影响。区域1的HC - E曲线呈蝴蝶状，而区域2没有变化。在不同的磁感应强度下，以E =±10 kV/cm测量的HC。
Electric field (E) control of the magnetic anisotropy and coercivity (HC) of a Fe film in Fe/BaTiO3 (BTO) is demonstrated at room temperature in the tetragonal phase of BTO. Polarizing microscopy and x-ray diffraction analysis of BTO (001) surface show distinctly two different regions; one with a1, a2 and c domains separated by 180° and 90° domain boundaries (DBs) (region 1) and the other with a1 domains separated by 180° DBs (region 2). The Fe film on region 1 shows complex magnetic anisotropy with the net magnetic easy axis in between [100] and [110] directions of BTO, while the magnetic anisotropy in region 2 exhibits two fold symmetry with an easy axis along [100]. In applied electric field (±10 kV/cm), the magnetic easy axis of the Fe film in region 1 is switched to the [110] direction of BTO, whereas in region 2 it stays unaffected. The HC versus E curves in region 1 show a butterfly-like behavior, while in region 2 no changes are observed. Also, the HC measured in E = ±10 kV/cm at different magneti...