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arXiv 1005.3463cond-mat.stat-mechcond-mat.mes-hallcond-mat.mtrl-sci
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相互作用的、外部驱动的顶点系统中的有效温度:人工自旋冰的理论和实验

Effective Temperature in an Interacting, Externally Driven, Vertex System: Theory and Experiment on Artificial Spin Ice

Cristiano Nisoli, Jie Li, Xianglin Ke, D. Garand, Peter Schiffer, Vincent H. Crespi

摘要:

相互作用的单畴纳米磁体的受抑阵列为统计力学提供了重要的模型系统,因为它们紧密地映射到充分研究的顶点模型上,并且适合于直接成像和定制工程。虽然这些系统是明显的无热,我们证明,六角和正方形晶格的统计特性可以描述的阵列的静磁能的基础上的有效温度。这个温度具有预测力的时刻配置,是密切相关的时刻是如何驱动的振荡外部场。

英文摘要:

Frustrated arrays of interacting single-domain nanomagnets provide important model systems for statistical mechanics, because they map closely onto well-studied vertex models and are amenable to direct imaging and custom engineering. Although these systems are manifestly athermal, we demonstrate that the statistical properties of both hexagonal and square lattices can be described by an effective temperature based on the magnetostatic energy of the arrays. This temperature has predictive power for the moment configurations and is intimately related to how the moments are driven by an oscillating external field.

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