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磁斯格明子拓扑特性及其动力学微磁学模拟研究进展

孔令尧

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磁斯格明子拓扑特性及其动力学微磁学模拟研究进展

孔令尧

Research progress on topological properties and micro-magnetic simulation study in dynamics of magnetic skyrmions

Kong Ling-Yao
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  • 具有非平庸拓扑性的新型磁结构斯格明子,由于其拓扑稳定性、尺寸小、低电流驱动等方面的显著优势,有望应用于自旋电子学储存器件.拓扑和凝聚态物理学的结合,使得斯格明子展现出很多有趣的拓扑物理现象,吸引了众多的研究兴趣,同时这些性质也是其电流驱动下动力学特点的重要影响因素.本文从斯格明子的拓扑物理学基础及其自旋电子学器件应用相关动力学两个方面介绍了相关研究进展.在拓扑物理基础方面,介绍了斯格明子的拓扑霍尔效应、斯格明子霍尔效应以及自旋轨道转矩等拓扑性质,由此讨论了斯格明子的动力学性质及其计算方法;在动力学方面,从非均匀电流驱动生成斯格明子、电流驱动下的稳定输运、产生湮灭过程的人工控制几个赛道存储应用关心的问题简要地介绍了相关微磁学模拟研究最新进展.
    Skyrmions, as a nontrivial topological magnetic structure, have the advantages of topological stability, small size and low driving electrical current, showing potential applications in spintronic memory device. There are several mechanisms for skyrmion formation in magnets. One major mechanism is, in chiral-lattice ferromagnets, the competition between the Dzyaloshinskii-Moriya and ferromagnetic exchange interactions, due to the lack of spatial inversion symmetry. The combination of topology and condensed physics demonstrates various new topological phenomena of skyrmions, which also determine their dynamics. In this review, recent progress on the topological physics foundation of Skyrmions, as well as their dynamics of application in spintronics devices, is reviewed. The topological physics foundations of skyrmions is introduced. Firstly, the structure of skyrmions, which shows a special nontrivial topology in the real space, is presented accompanied with the formation of skyrmions caused by Dzyaloshinskii Moriya interactions in chiral magnets. Secondly, due to the importance of the describable method of the topology of a skyrmion, the topological charge, that characterize the topology, as well as the calculation method are introduced. Also, the arising topological stability is discussed here. Then, the typical topological effects arising from the topology of a skyrmion, including topological Hall effect and the skyrmion Hall effect are reviewed. The next is the introduction of the helical and the spiral spin configuration, the alternatives for Bloch and Nal type skyrmions respectively, which show up under lower external magnetic field with the same interaction. Also the phase transition of the helical/spiral state to skyrmions and the Monte Carlo method to simulate the spin configuration of a chiral magnet are introduced. At last, the spin orbital torque and the spin transfer torque, that describe the driven effect of a skyrmion by an electrical current or a thermal field, are reviewed. The consequence dynamics of skyrmions, the Landau-LifshitzGilbert equation, are also introduced. The recent progress of typical dynamics of skyrmions on several concerned problems in practical applications are reviewed. The applications in spintronics memory require skyrmions have steady transportation driven by electrical current and controllable creation and annihilation process. Firstly, skyrmion can be generated by the spatial nonuniform electric current with a certain geometry constrain. Especially for the Nal type skyrmion, nonuniformity of the spin orbital torque, come from the non-uniform electric current, play an important role in the skyrmion generation process. Secondly, skyrmion moves with a perpendicular velocity under an electrical current, because of the skyrmion Hall effect. So the elimination of skyrmion Hall effect is practically concerned to make the transportation steady. The anti-ferromagnetic skyrmion and antiferromagnetic coupled skyrmion bilayer are found with no skyrmion Hall effect by have two opposite component cancel out. Finally, with topological stability, skyrmions are hard to convert from and to a nontrivial topological spin configuration at low temperature. So the manipulation of skyrmion creation and annihilation are discussed accompanied with their difference of Bloch and Nal type skyrmiom.
      通信作者: 孔令尧, LingyaoKong@163.com
    • 基金项目: 国家自然科学基金(批准号:11504351)资助的课题.
      Corresponding author: Kong Ling-Yao, LingyaoKong@163.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11504351).
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  • [1]

    Skyrme T 1962 Nucl. Phys. 31 556

    [2]

    Polyakov A M, Belavin A A 1975 Jetp Lett. 22 503

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    [5]

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    [6]

    Hoffmann A 2013 IEEE Trans. Magn. 49 5172

    [7]

    Fert A, Cros V, Sampaio J 2013 Nat. Nanotechnol. 8 152

    [8]

    Hellman F, Hoffmann A, Tserkovnyak Y, Beach G S, Fullerton E E, Leighton C, MacDonald A H, Ralph D C, Arena D A, Drr H A, Fischer P, Grollier J, Heremans J P, Jungwirth T, Kimel A V, Koopmans B, Krivorotov I N, May S J, Petford L A K, Rondinelli J M, Samarth N, Schuller I K, Slavin A N, Stiles M D, Tchernyshyov O, Thiaville A, Zink B L 2017 Rev. Mod. Phys. 89 025006

    [9]

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    [10]

    Yi S D, Onoda S, Nagaosa N, Han J H 2009 Phys. Rev. B 80 054416

    [11]

    Neubauer A, Pfleiderer C, Binz B, Rosch A, Ritz R, Niklowitz P G, Bni P 2009 Phys. Rev. Lett. 102 186602

    [12]

    Zang J, Mostovoy M, Han J H, Nagaosa N 2011 Phys. Rev. Lett. 107 136804

    [13]

    Litzius K, Lemesh I, Krger B, Bassirian P, Caretta L, Richter K, Bttner F, Sato K, Tretiakov O A, Frster J, Reeve R M, Weigand M, Bykova I, Stoll H, Schtz G, Beach G S D, Klui M 2016 Nat. Phys. 13 170

    [14]

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    [15]

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    [16]

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    [17]

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    [18]

    Kang W, Huang Y, Zhang X, Zhou Y, Zhao W 2016 Proc. IEEE 104 2040

    [19]

    Kang W, Zheng C, Huang Y, Zhang X, Zhou Y, Lv W, Zhao W 2016 IEEE Electron Dev. Lett. 37 924

    [20]

    Parkin S S P, Hayashi M, Thomas L 2008 Science 320 190

    [21]

    Parkin S, Yang S H 2015 Nat. Nanotechnol. 10 195

    [22]

    Pfleiderer C, Rosch A 2010 Nature 465 880

    [23]

    Yu X Z, Kanazawa N, Onose Y, Kimoto K, Zhang W Z, Ishiwata S, Matsui Y, Tokura Y 2010 Nat. Mater. 10 106

    [24]

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    [26]

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    [29]

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    [30]

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    [31]

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    [32]

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出版历程
  • 收稿日期:  2018-01-31
  • 修回日期:  2018-03-18
  • 刊出日期:  2018-07-05

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