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首页> 外文期刊>Physical review >Surface pinning and triggered unwinding of skyrmions in a cubic chiral magnet
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Surface pinning and triggered unwinding of skyrmions in a cubic chiral magnet

机译：在立方手性磁体中固定并触发天空中的重金属的展开

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摘要

In the cubic chiral magnet Fe1-xCoxSi a metastable state comprising topologically nontrivial spin whirls, so-called skyrmions, may be preserved down to low temperatures by means of field cooling the sample. This metastable skyrmion state is energetically separated from the topologically trivial ground state by a considerable potential barrier, a phenomenon also referred to as topological protection. Using magnetic force microscopy on the surface of a bulk crystal, we show that certain positions are preferentially and reproducibly decorated with metastable skyrmions, indicating that surface pinning plays a crucial role. Increasing the magnetic field allows an increasing number of skyrmions to overcome the potential barrier and hence to transform into the ground state. Most notably, we find that the unwinding of individual skyrmions may be triggered by the magnetic tip sample interaction itself, however, only when its magnetization is aligned parallel to the external field. This implies that the stray field of the tip is key for locally overcoming the topological protection. Both the control of the position of topologically nontrivial states and their creation and annihilation on demand pose important challenges in the context of potential skyrmionic applications.
机译：在立方手性磁体Fe1-xCoxSi中，可以通过现场冷却样品的方式将包括拓扑上无关紧要的自旋涡旋的所谓的“天体离子”亚稳态保存到低温。这种亚稳态的天空形子态通过相当大的势垒从能量上与拓扑琐碎的基态分离开来，这种现象也称为拓扑保护。在大块晶体的表面上使用磁力显微镜观察，我们发现某些位置被优先和可重复地装饰有亚稳天花，表明表面钉扎起着至关重要的作用。磁场的增加允许增加数量的天体离子克服势垒，从而转变为基态。最值得注意的是，我们发现单个天琴的解开可能是由磁性尖端样品相互作用本身触发的，但是，仅当其磁化强度平行于外部磁场对齐时才会触发。这意味着尖端的杂散场是局部克服拓扑保护的关键。在潜在的空中离子应用中，对拓扑非平凡状态的位置的控制及其按需创建和an灭都提出了重要挑战。

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  • 来源
    《Physical review》 |2019年第2期|024408.1-024408.9|共9页
  • 作者

    Milde Peter; Neuber Erik; Bauer Andreas; Pfleiderer Christian; Eng Lukas M.;

  • 作者单位

    Tech Univ Dresden, Inst Appl Phys, D-01062 Dresden, Germany;

    Tech Univ Dresden, Inst Appl Phys, D-01062 Dresden, Germany;

    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany;

    Tech Univ Munich, Phys Dept, D-85748 Garching, Germany;

    Tech Univ Dresden, Inst Appl Phys, D-01062 Dresden, Germany|Tech Univ Dresden, Ctr Excellence Complex & Topol Quantum Matter Ct, D-01062 Dresden, Germany;

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