磁致伸缩纳米磁体偶极耦合阵列中的时变应变模拟退火
Simulated annealing with time-varying strain in a dipole-coupled array of magnetostrictive nanomagnets
摘要：
在具有面内磁各向异性的紧密间隔的椭圆形纳米磁体的二维排列中，其长轴沿着列对齐，短轴沿着行对齐，偶极耦合将使磁排序沿着列为“铁磁性”，沿着行为“反铁磁性”。噪声和其它扰动可以驱动系统离开该基态配置并且将其钉扎在磁化取向将不遵循该模式的亚稳态中。足够大于热能kT的内能垒将阻止系统离开亚稳态并自发地衰减到基态。如果纳米磁体是磁致伸缩的，则这些势垒可以通过用时变应变对纳米磁体进行全局应变而暂时被侵蚀，这将允许系统在应变被移除之后返回到基态。这是一个多体系统相互作用的模拟退火的硬件仿真。在这里，我们通过实验证明了这一功能。
英文摘要：
In a two-dimensional arrangement of closely spaced elliptical nanomagnets with in-plane magnetic anisotropy, whose major axes are aligned along columns and minor axes along rows, dipole coupling will make the magnetic ordering "ferromagnetic" along the columns and "anti-ferromagnetic" along the rows. Noise and other perturbations can drive the system out of this ground state configuration and pin it in a metastable state where the magnetization orientations will not follow this pattern. Internal energy barriers, sufficiently larger than the thermal energy kT, will prevent the system from leaving the metastable state and decaying spontaneously to the ground state. These barriers can be temporarily eroded by globally straining the nanomagnets with time-varying strain if the nanomagnets are magnetostrictive, which will allow the system to return to ground state after strain is removed. This is a hardware emulation of simulated annealing in an interacting many body system. Here, we demonstrate this function experimentally.
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