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arXiv 1601.05752cond-mat.str-el
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手征磁体三维模型中新的螺旋态和Skyrmion晶格

New spiral state and skyrmion lattice in 3D model of chiral magnets

F. N. Rybakov, A. B. Borisov, S. Blügel, N. S. Kiselev

摘要:

本文给出了各向同性手征磁体薄膜的磁态相图,它是外加磁场和薄膜厚度的函数。我们已经发现了一种新的磁状态驱动的自然限制的晶体,本地化的表面和堆积在顶部的锥形体相。这种磁性表面状态具有由螺旋和摆线自旋螺旋的叠加描述的三维(3D)手性自旋纹理。这种表面状态存在一个大范围的应用磁场和任何薄膜厚度超过一个临界。我们还确定了整个厚度和场的范围,为skyrmion晶格成为系统的基态。低于一定的临界厚度的表面状态和体锥相抑制有利于skyrmion晶格。使用应用于手征磁铁基本3D模型的直接能量最小化的高级计算技术,解开这些相并构建相图成为可能。所提出的结果提供了一个全面的理论描述,这些影响已经在实验中观察到的手征性磁体的薄膜,预测新的影响重要的应用和开放的前景,这样的系统的实验研究。

英文摘要:

We present the phase diagram of magnetic states for films of isotropic chiral magnets calculated as function of applied magnetic field and thickness of the film. We have found a novel magnetic state driven by the natural confinement of the crystal, localized at the surface and stacked on top of the conical bulk phase. This magnetic surface state has a three-dimensional (3D) chiral spin-texture described by the superposition of helical and cycloidal spin spirals. This surface state exists for a large range of applied magnetic fields and for any film thickness beyond a critical one. We also identified the whole thickness and field range for which the skyrmion lattice becomes the ground state of the system. Below a certain critical thickness the surface state and bulk conical phase are suppressed in favor of the skyrmion lattice. Unraveling of those phases and the construction of the phase diagram became possible using advanced computational techniques for direct energy minimization applied to a basic 3D model for chiral magnets. Presented results provide a comprehensive theoretical description for those effects already observed in experiments on thin films of chiral magnets, predict new effects important for applications and open perspectives for experimental studies of such systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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