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Abstract：
Core-shell magnetoelectric nanoparticles (MENPs) have recently gained popularity thanks to their capability in inducing a local electric polarization upon an applied magnetic field and vice versa. This work estimates the magnetoelectrical behavior, in terms of magnetoelectric coupling coefficient (αME), via finite element analysis of MENPs with different shapes under either static (DC bias) and time-variant (AC bias) external magnetic fields. With this approach, the dependence of the magnetoelectrical performance on the MENPs geometrical features can be directly derived. Results show that MENPs with a more elongated morphology exhibits a superior αME if compared with spherical nanoparticles of similar volume, under both stimulation conditions analyzed. This response is due to the presence of a larger surface area at the interface between the magnetostrictive core and piezoelectric shell, and to the MENP geometrical orientation along the direction of the magnetic field. These findings pave a new way for the design of novel high-aspect ratio magnetic nanostructures with an improved magnetoelectric behaviour.
摘要：
核壳磁电纳米粒子(MENP)最近由于其在施加磁场时诱导局部电极化的能力而变得流行,反之亦然。这项工作估计了磁电行为，就磁电耦合系数(αME)而言，通过在静态（直流偏置）和时变（交流偏置）外部磁场下对不同形状的MENP进行有限元分析。通过这种方法，可以直接得出磁电性能对MENP几何特征的依赖性。结果表明，如果与类似体积的球形纳米颗粒相比，具有更细长形态的MENP表现出优异的αME，在两种刺激条件下进行了分析。这种响应是由于在磁致伸缩芯和压电壳之间的界面处存在较大的表面积，以及沿着磁场方向的MENP几何取向。这些发现为设计具有改善的磁电行为的新型高纵横比磁性纳米结构铺平了新途径。
