Strong strain dependence of ferroelectric coercivity in a BiFeO3 film
Strong strain dependence of ferroelectric coercivity in a BiFeO3 film
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DOI：
10.1063/1.3569137
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发表时间：
2011-04-04
影响因子：
4
通讯作者：
Doerr, K.
中科院分区：
文献类型：
--
作者：
Biegalski, M. D.;Kim, D. H.;Doerr, K.
研究了压电衬底上外延BiFeO_3薄膜的铁电极化曲线随应变连续可逆变化的关系。在此范围内，铁电矫顽场（E-C）在80 K可逆增加36%，随着拉伸应变的增加。相比之下，相场模拟预测dE（C）/dE < 0的相反趋势。因此，我们将观察到的E-C（ε）依赖性归因于畴动力学的应变依赖性，这在热力学模型中是不包括的。反射极化的应变依赖性与以前的结果一致。(C)2011年美国物理学会。[doi 10.1063/1.3569137]
The ferroelectric polarization loop of an epitaxial BiFeO3 film on a piezoelectric substrate has been investigated as a function of continuously and reversibly varied biaxial strain of epsilon = 0.36%-0.51%. Over this range, the ferroelectric coercive field (E-C) at 80 K increases reversibly by 36% with the increasing tensile strain. In contrast, phase-field simulations predict the opposite trend of dE(C)/d epsilon < 0. Therefore, we attribute the observed E-C(epsilon) dependence to the strain dependence of domain dynamics, which are not included in thermodynamic models. The strain dependence of the remanent polarization agrees with previous results. (C) 2011 American Institute of Physics. [doi:10.1063/1.3569137]