连通元人工蜂窝晶格中自旋固体与磁荷有序态
Spin Solid versus Magnetic Charge Ordered State in Artificial Honeycomb Lattice of Connected Elements
摘要：
二维人工磁性蜂窝晶格中低温磁关联的性质一直是人们争论的焦点。理论研究表明，当T -> 0 K时，系统将形成一种新的零熵自旋固态，但在连通元的人工蜂窝晶格中，这一效应还没有得到证实。我们报告的磁相关性的调查，在新设计的人工坡莫合金蜂窝晶格的超小元素，具有典型的长度为~ 12 nm，使用中子散射测量和温度相关的微磁模拟。极化中子反射计数据的数值模拟阐明了该系统中自旋关联随温度的演化。当温度降低到~ 7 K时，系统趋向于发展新的自旋固态，表现为相反手征的磁涡旋环的交替分布。实验结果的补充与温度相关的微磁学模拟，证实自旋固体状态的主导地位，局部磁荷有序状态的人工蜂窝晶格与连接的元素。我们的研究结果使新的自旋固体相关的直接调查在连接的蜂窝几何形状的二维人工结构。
英文摘要：
The nature of magnetic correlation at low temperature in two-dimensional artificial magnetic honeycomb lattice is a strongly debated issue. While theoretical researches suggest that the system will develop a novel zero entropy spin solid state as T --> 0 K, a confirmation to this effect in artificial honeycomb lattice of connected elements is lacking. We report on the investigation of magnetic correlation in newly designed artificial permalloy honeycomb lattice of ultra-small elements, with a typical length of ~ 12 nm, using neutron scattering measurements and temperature dependent micromagnetic simulations. Numerical modeling of the polarized neutron reflectometry data elucidates the temperature dependent evolution of spin correlation in this system. As temperature reduces to ~ 7 K, the system tends to develop novel spin solid state, manifested by the alternating distribution of magnetic vortex loops of opposite chiralities. Experimental results are complemented by temperature dependent micromagnetic simulations that confirm the dominance of spin solid state over local magnetic charge ordered state in the artificial honeycomb lattice with connected elements. Our results enable a direct investigation of novel spin solid correlation in the connected honeycomb geometry of two-dimensional artificial structure.
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