论文标题
磁性纳米膜和电线的波纹引起的磁电力
Magnetoelectricity induced by rippling of magnetic nanomembranes and wires
论文作者
论文摘要
磁电晶体具有有趣的特性，它们允许电场诱导磁性极化，反之亦然，磁场可产生铁电偏振。具有这样的磁电耦合通常需要复杂的磁纹理类型，例如螺旋式类型。在这里，我们建立了一种新的方法，可以在具有传统的铁磁底态的绝缘子中生成线性磁电耦合。我们表明，纳米级弯曲的几何形状导致磁纹理的重组，该磁纹理会自发打破反转对称性，从而引起宏观磁电磁多物。具体而言，我们证明，以受控波纹形式的结构变形激活了最近合成的二维磁体中的磁电词。我们还证明，在平面体系结构中的锯齿形的铁磁线中，磁环矩触发了直接的线性磁电耦合。
Magnetoelectric crystals have the interesting property that they allow electric fields to induce magnetic polarizations, and vice versa, magnetic fields to generate ferroelectric polarizations. Having such a magnetoelectric coupling usually requires complex types of magnetic textures, e.g., of spiralling type. Here we establish a novel approach to generate a linear magnetoelectric coupling in insulators with a conventional, ferromagnetic ground state. We show that nanoscale curved geometries lead to a reorganization of the magnetic texture that spontaneously breaks inversion symmetry and thereby induces macroscopic magnetoelectric multipoles. Specifically, we prove that structural deformation in the form of controlled ripples activate a magnetoelectric monopole in the recently synthesised two-dimensional magnets. We also demonstrate that in zig-zag shaped ferromagnetic wires in planar architectures, a magnetic toroidal moment triggers a direct linear magnetoelectric coupling.
