The properties of isolated chiral skyrmions in thin magnetic films
The properties of isolated chiral skyrmions in thin magnetic films
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DOI：
10.1088/1367-2630/18/6/065003
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发表时间：
2016-05-31
影响因子：
3.3
通讯作者：
Wiesendanger, R.
中科院分区：
文献类型：
--
作者：
Leonov, A. O.;Monchesky, T. L.;Wiesendanger, R.
轴对称孤子态（手征skyrmions）在二十多年前首次被理论预测。然而，直到最近，它们才被观察到以Skyrmionic凝聚物（六方晶格和其他中间相）的形式存在。在本文中，我们报告了两年前由Romming等人（2013 Science 341 636）在PdFe/Ir（111）双层膜中发现的孤立手性skyrmions的实验和理论研究。自旋极化扫描隧道显微镜的连续和离散模型内分析的结果提供了一个一致的描述孤立的skyrmions在薄层。手征Skyrmions的存在区域受到低场剥离不稳定性和高场坍缩的限制。我们证明了相同的方程描述轴对称局域态在所有凝聚态系统与破缺镜像对称，因此，我们的研究结果建立了孤立的skyrmions常见的手性液晶，不同类别的非中心对称磁体，铁电体和多铁性的基本属性。
Axisymmetric solitonic states (chiral skyrmions) were first predicted theoretically more than two decades ago. However, until recently they have been observed in a form of skyrmionic condensates (hexagonal lattices and other mesophases). In this paper we report experimental and theoretical investigations of isolated chiral skyrmions discovered in PdFe/Ir(111) bilayers two years ago by Romming et al (2013 Science 341 636). The results of spin-polarized scanning tunneling microscopy analyzed within the continuum and discrete models provide a consistent description of isolated skyrmions in thin layers. The existence region of chiral skyrmions is restricted by strip-out instabilities at low fields and a collapse at high fields. We demonstrate that the same equations describe axisymmetric localized states in all condensed matter systems with broken mirror symmetry, and thus our findings establish basic properties of isolated skyrmions common for chiral liquid crystals, different classes of noncentrosymmetric magnets, ferroelectrics, and multiferroics.