纳米铁电材料的自发挠曲效应
Spontaneous flexoeffect in nanoferroics
摘要：
在Landau-Ginsburg-Devonshire唯象方法中，我们研究了由于序参量的不均匀性而自发存在的挠曲效应（挠曲电、挠曲磁、挠曲弹性）引起的铁性纳米系统性质的变化。精确的解决方案，空间不均匀的机械位移矢量，允许弯曲耦合的贡献被发现的纳米线和薄丸。在纳米棒和薄丸中，弯曲效应的强烈影响导致原子的位移，导致晶胞对称性的改变，从而导致相变温度的变化，以及径向平坦几何形状转变为碟状几何形状。这些新现象可以被认为是自发挠曲效应存在的真实表现。结果表明，挠曲效应导致了新的线性和非线性贡献的出现以及序参量梯度前系数的重正化，对相变温度、压电响应和序参量的空间分布产生了本质的影响，并导致了边界条件外推长度的重正化.
英文摘要：
Within the Landau-Ginsburg-Devonshire phenomenological approach we study the ferroic nanosystems properties changes caused by the flexo-effect (flexoelectric, flexomagnetic, flexoelastic) existing spontaneously due to the inhomogeneity of order parameters. Exact solution for the spatially inhomogeneous mechanical displacement vector allowing for flexo-coupling contribution was found for nanowires and thin pills. Strong influence of flexo-effect in nanorods and thin pills leads to the displacements of the atoms resulting into the unit cell symmetry changes, which lead to the phase transition temperature shift, as well as the flat geometry in radial direction transforms into the saucer-like one. The new phenomena can be considered as true manifestation of the spontaneous flexo-effect existence. It was shown that flexo-effect leads to (a) the appearance of new linear and nonlinear contribution and renormalization of coefficients before the order parameter gradient, (b) essentially influences the transition temperature, piezoelectric response and the spatial distribution of the order parameter, (c) results in renormalization of extrapolation length in the boundary conditions.
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