Eu0 .6Y0.4MnO3陶瓷的极性及其与磁场的关系
Polar properties of Eu0.6Y0.4MnO3 ceramics and their magnetic field dependence
摘要：
Eu_（1-x）Y_xMnO_3与其他磁电系统不同，具有非常独特的特性。它的磁电性质是由Mn 3+离子的磁自旋驱动的，但是它们可以通过改变Y 3+的含量而急剧改变，Y 3+不携带任何磁矩。虽然x = 0.40的组成已经被广泛研究，但一些基本问题仍有待彻底理解。因此，这项工作的目的是研究它的一些极性性质和它们的磁场依赖性以及。本文报道的实验结果表明，这种材料在外加电场下很容易极化，因此，每当极化是从位移电流的时间积分获得时，诱导极化被叠加到自发极化上，最终掩盖了铁电性的发生。我们已经找到了明确的证据，磁场的影响的极性性质的Eu 0.6Y 0.4MnO 3。研究了Eu_（0.6）Y_（0.4）MnO_3在外加磁场作用下的电极化的强度，得到了一个与极化反转实验所测得的回复极化具有相同数量级的值。比较多晶样品和单晶样品中获得的磁致极化变化，证实了从a方向到c方向的极化旋转的阈值磁场值，并证明了样品的颗粒性质在对磁场的极性响应中的重要性。
英文摘要：
Eu1-xYxMnO3 exhibits, unlike other magnetoelectric systems, very distinctive features. Its magnetoelectric properties is driven by the magnetic spin of the Mn3+ ion, but they can be drastically changed by varying the content of Y3+, which it does not carry any magnetic moment. Though the x = 0.40 composition has been studied extensively, some basic questions still remain to be thoroughly understood. Thus, this work is aimed at studying some of its polar properties and their magnetic field dependence as well. The experimental results here reported have shown that this material is very easily polarisable under external electric fields, and so, whenever the polarization is obtained from time integration of the displacement currents, an induced polarization is superposed to the spontaneous one, eventually masking the occurrence of ferroelectricity. We have found clear evidence for the influence of a magnetic field in the polar properties of Eu0.6Y0.4MnO3. The study of electric polarization of Eu0.6Y0.4MnO3 under an external magnetic field yields a value with the same order of magnitude of the remanent polarization determined from polarization reversal experiments. The comparison of the magnetic induced changes on the polarization obtained in polycrystalline samples and single crystals confirms the threshold magnetic field value for the polarization rotation from the a- to the c-direction, and evidencing the importance of the granular nature of the samples in the polar response to magnetic field.
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