Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA.
Soft Matter. 2018 Jul 18;14(28):5856-5868. doi: 10.1039/c8sm00587g.
Magnetoelectric materials that convert magnetic fields into electricity and vice versa are rare and usually complex, hard crystalline alloys. Recent work has shown that soft, highly deformable magnetoelectric materials may be created by using a strain-mediated mechanism. The electromagnetic and elastic deformation of such materials is intricately coupled, giving rise to a rather rich instability and bifurcation behavior that may limit or otherwise put bounds on the emergent magnetoelectric behavior. In this work, we investigate the magneto-electro-mechanical instability of a soft dielectric film subject to mechanical forces and external electric and magnetic fields. We explore the interplay between mechanical strain, electric voltage and magnetic fields and their impact on the maximum voltage and the stretch the dielectric material can reach. Specifically, we present physical insights to support the prospects to achieve wireless energy harvesting through remotely applied magnetic fields.
磁电材料可以将磁场转化为电能，反之亦然，但它们很少见且通常是复杂的硬结晶合金。最近的研究表明，通过使用应变介导机制，可以制造出柔软、高可变形的磁电材料。这种材料的电磁和弹性变形是错综复杂地耦合在一起的，从而产生了相当丰富的不稳定性和分岔行为，这可能会限制或限制新兴的磁电行为。在这项工作中，我们研究了在机械力以及外加电场和磁场作用下软介电膜的磁电机械不稳定性。我们探索了机械应变、电压和磁场之间的相互作用及其对介电材料所能达到的最大电压和拉伸的影响。具体来说，我们提出了物理见解来支持通过远程施加磁场实现无线能量收集的前景。
