Size effect on magnetoelectric coupling in multiferroic heterostructures

Size effect on magnetoelectric coupling in multiferroic heterostructures
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多铁异质结构中磁电耦合的尺寸效应

DOI:
10.1063/1.3569748
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发表时间:
2011-04
影响因子:
3.2
通讯作者:
Li, Hui
Li, Hui
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Lu, XiaoYan;Li, Hui

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基于热力学理论,在考虑表面效应和尺寸效应的情况下,研究了层状多铁性异质结构中尺寸相关的磁电耦合效应。通过数值计算,研究了在厚CoFe 2 O 4衬底上SrRuO 3电极间外延生长BaTiO 3薄膜的临界尺寸,并找到了发生顺铁电相变的临界点.在所考虑的系统中的BaTiO_3薄膜的临界尺寸约为37-56 nm,这是依赖于所施加的磁致伸缩,因为强的磁电耦合效应。磁电耦合效应在临界尺寸附近不稳定,低于临界尺寸时消失。
Based on thermodynamic theory, size-dependent magnetoelectric coupling effect in layered multiferroic heterostructures was investigated with the consideration of surface effect and size effect. Critical size of the BaTiO3 thin film epitaxially grown between SrRuO3 electrodes on a thick CoFe2O4 substrate was probed numerically by finding the point where paraferroelectric phase transition occurs. The critical size of the BaTiO3 film in the considered system is about 37–56 nm, which is dependent on the applied magnetostriction because of the strong magnetoelectric coupling effect. The magnetoelectric coupling effect is unstable in the vicinity of the critical size and disappears below the critical size.
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