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首页> 外文期刊>Physical review >Formation of magnetic skyrmions with tunable properties in PdFe bilayer deposited on Ir(111)
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Formation of magnetic skyrmions with tunable properties in PdFe bilayer deposited on Ir(111)

机译：在Ir（111）上沉积的PdFe双层中具有可调性质的磁性天体离子的形成

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摘要

We perform an extensive study of the spin-configurations in a PdFe bilayer on Ir(111) in terms of ab initio and spin-model calculations. We use the spin-cluster expansion technique to obtain spin model parameters, and solve the Landau-Lifshitz-Gilbert equations at zero temperature. In particular, we focus on effects of layer relaxations and the evolution of the magnetic ground state in an external magnetic field. In the absence of a magnetic field, we find a spin-spiral ground state; while applying an external magnetic field, skyrmions are generated in the system. Based on energy calculations of frozen spin configurations with varying magnetic field we obtain excellent agreement for the phase boundaries with available experiments. We find that the wavelength of spin-spirals and the diameter of skyrmions decrease with increasing inward Fe layer relaxation, which is correlated with the increasing ratio of the nearest-neighbor Dzyaloshinskii-Moriya interaction and the isotropic exchange coupling, D/J. Our results also indicate that the applied field needed to stabilize the skyrmion lattice increases when the diameter of individual skyrmions decreases. Based on our observations, we suggest that the formation of the skyrmion lattice can be tuned by small structural modification of the thin film.
机译：我们从头算和自旋模型计算方面，对Ir（111）上PdFe双层中的自旋构型进行了广泛的研究。我们使用自旋簇扩展技术获得自旋模型参数，并在零温度下求解Landau-Lifshitz-Gilbert方程。特别是，我们关注于外部磁场中层弛豫的影响以及磁性基态的演化。在没有磁场的情况下，我们发现自旋螺旋基态。在施加外部磁场的同时，系统中会产生天体离子。基于具有变化磁场的冻结自旋结构的能量计算，我们通过可用的实验获得了相界的极佳协议。我们发现，自旋螺旋的波长和天空碎片的直径随着向内Fe层弛豫的增加而减小，这与最近邻Dzyaloshinskii-Moriya相互作用和各向同性交换耦合D / J的比率增加相关。我们的结果还表明，当单个天sky子的直径减小时，稳定天rm子晶格所需的应用场会增加。根据我们的观察，我们建议可以通过对薄膜进行小的结构修饰来调整天蝎子晶格的形成。

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  • 来源
    《Physical review》 |2014年第9期|094410.1-094410.7|共7页
  • 作者

    E. Simon; K. Palotas; L. Rozsa; L. Udvardi; L. Szunyogh;

  • 作者单位

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary,MTA-BME Condensed Matter Research Group, Budafoki ut 8, H-1111 Budapest, Hungary;

    Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary,MTA-BME Condensed Matter Research Group, Budafoki ut 8, H-1111 Budapest, Hungary;

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  • 正文语种 eng
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  • 关键词

    domain structure (including magnetic bubbles); methods of electronic structure calculations; magnetic properties of monolayers and thin films;

    机译：畴结构（包括磁性气泡）;电子结构计算方法;单层和薄膜的磁性;

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