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用光诱导畴壁踢开实现对磁性纳米线的动态控制。

Dynamic control of magnetic nanowires by light-induced domain-wall kickoffs.

机构信息

Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany.

出版信息

Nat Mater. 2013 Mar;12(3):202-6. doi: 10.1038/nmat3498. Epub 2012 Dec 2.

Abstract

Controlling the speed at which systems evolve is a challenge shared by all disciplines, and otherwise unrelated areas use common theoretical frameworks towards this goal. A particularly widespread model is Glauber dynamics, which describes the time evolution of the Ising model and can be applied to any binary system. Here we show, using molecular nanowires under irradiation, that Glauber dynamics can be controlled by a novel domain-wall kickoff mechanism. In contrast to known processes, the kickoff has unambiguous fingerprints, slowing down the spin-flip attempt rate by several orders of magnitude, and following a scaling law. The required irradiance is very low, a substantial improvement over present methods of magneto-optical switching. These results provide a new way to control and study stochastic dynamic processes. Being general for Glauber dynamics, they can be extended to different kinds of magnetic nanowires and to numerous fields, ranging from social evolution to neural networks and chemical reactivity.

摘要

控制系统演化的速度是所有学科共同面临的挑战,而其他不相关的领域则使用共同的理论框架来实现这一目标。一种特别广泛应用的模型是格玻尔动力学,它描述了伊辛模型的时间演化,可以应用于任何二进制系统。在这里,我们通过受辐照的分子纳米线表明,格玻尔动力学可以通过一种新的畴壁引发机制来控制。与已知的过程相比,这种引发机制具有明确的特征,可以将自旋翻转尝试率降低几个数量级,并遵循一个标度律。所需的辐照度非常低,这比现有的磁光开关方法有了实质性的改进。这些结果为控制和研究随机动力学过程提供了一种新方法。由于格玻尔动力学具有普遍性,它们可以扩展到不同类型的磁性纳米线和众多领域,包括社会进化、神经网络和化学反应性。

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