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arXiv 1407.7416cond-mat.mes-hall
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人工阻挫自旋系统的非普适性

Non-universality of artificial frustrated spin systems

I. A. Chioar, N. Rougemaille, A. Grimm, O. Fruchart, E. Wagner, M. Hehn, D. Lacour, F. Montaigne, B. Canals

摘要:

利用磁力显微镜和蒙特卡罗模拟研究了具有面外磁化的纳米磁体人工Kagome阵列中的磁阻挫效应。实验和理论结果进行比较,人工戈薇自旋冰,其中的纳米磁体具有面内磁化。与最近报道的相比,我们证明了纳米磁体之间的长程(即超越最近邻)偶极相互作用在描述使用场协议对阵列消磁后观察到的磁配置时不能被忽略。因此,在这两个人工受抑自旋系统的行为中,任何普遍性都有明显的限制。我们提供的参数来解释为什么这两个系统显示惊人的相似之处,在第一眼的发展成对自旋相关性。

英文摘要:

Magnetic frustration effects in artificial kagome arrays of nanomagnets with out-of-plane magnetization are investigated using Magnetic Force Microscopy and Monte Carlo simulations. Experimental and theoretical results are compared to those found for the artificial kagome spin ice, in which the nanomagnets have in-plane magnetization. In contrast with what has been recently reported, we demonstrate that long range (i.e. beyond nearest-neighbors) dipolar interactions between the nanomagnets cannot be neglected when describing the magnetic configurations observed after demagnetizing the arrays using a field protocol. As a consequence, there are clear limits to any universality in the behavior of these two artificial frustrated spin systems. We provide arguments to explain why these two systems show striking similarities at first sight in the development of pairwise spin correlations.

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