Quantification of Magnetic Surface and Edge States in an FeGe Nanostripe by Off-Axis Electron Holography
Quantification of Magnetic Surface and Edge States in an FeGe Nanostripe by Off-Axis Electron Holography
复制标题
通过离轴电子全息术量化 FeGe 纳米带中的磁性表面和边缘状态
DOI：
10.1103/physrevlett.120.167204
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发表时间：
2018-04-19
影响因子：
8.6
通讯作者：
Dunin-Borkowski, Rafal E.
中科院分区：
文献类型：
--
作者：
Song, Dongsheng;Li, Zi-An;Dunin-Borkowski, Rafal E.
尽管理论研究揭示了磁性表面和边缘态对手性磁体中斯格蒙自旋结构的显着影响，但对此类手性态的实验研究仍然难以捉摸。在这里，我们使用离轴电子全息术实验研究 FeGe 纳米带中的手性边缘态。我们的结果揭示了磁场驱动的手性边缘态的形成及其在 95 和 240 K 时的穿透长度。我们通过分析螺旋和斯格明子的投影面内磁化强度分布来确定饱和磁化强度 M-s 的值。斯格明子的 M-s 推断值比螺旋的 M-s 值低几个百分点。我们将这种差异归因于手性表面态的存在，这是在三维斯格明子模型中理论上预测的。我们的实验提供了磁手性边界态的直接定量测量，并强调了最先进的电子全息术在纳米结构中复杂自旋纹理研究中的适用性。
Whereas theoretical investigations have revealed the significant influence of magnetic surface and edge states on Skyrmonic spin texture in chiral magnets, experimental studies of such chiral states remain elusive. Here, we study chiral edge states in an FeGe nanostripe experimentally using off-axis electron holography. Our results reveal the magnetic-field-driven formation of chiral edge states and their penetration lengths at 95 and 240 K. We determine values of saturation magnetization M-s by analyzing the projected in-plane magnetization distributions of helices and Skyrmions. Values of M-s inferred for Skyrmions are lower by a few percent than those for helices. We attribute this difference to the presence of chiral surface states, which are predicted theoretically in a three-dimensional Skyrmion model. Our experiments provide direct quantitative measurements of magnetic chiral boundary states and highlight the applicability of state-of-the-art electron holography for the study of complex spin textures in nanostructures.