磁涡旋中超交换驱动的磁电效应
Superexchange-Driven Magnetoelectricity in Magnetic Vortices
摘要：
我们证明，磁涡旋中的自旋耦合到极性晶格畸变通过超交换表现出异常大的线性磁电响应。我们表明，在Kagomé晶格上由受抑自旋形成的周期性涡旋阵列提供了这一概念的实现;我们的{ \it从头计算}对这样的模型结构产生的磁电系数比原型单相磁电系数大30倍。最后，我们确定了在实际材料中获得这样的响应所需的设计规则。
英文摘要：
We demonstrate that magnetic vortices in which spins are coupled to polar lattice distortions via superexchange exhibit an unusually large linear magnetoelectric response. We show that the periodic arrays of vortices formed by frustrated spins on Kagomé lattices provide a realization of this concept; our {\it ab initio} calculations for such a model structure yield a magnetoelectric coefficient that is 30 times larger than that of prototypical single phase magnetoelectrics. Finally, we identify the design rules required to obtain such a response in a practical material.
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