Enhanced Stability of the Magnetic Skyrmion Lattice Phase under a Tilted Magnetic Field in a Two-Dimensional Chiral Magnet
Enhanced Stability of the Magnetic Skyrmion Lattice Phase under a Tilted Magnetic Field in a Two-Dimensional Chiral Magnet
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二维手性磁体中倾斜磁场下磁性斯格明子晶格相稳定性的增强
DOI：
10.1021/acs.nanolett.7b00135
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发表时间：
2017
期刊：
影响因子：
10.8
通讯作者：
Che Renchao
中科院分区：
文献类型：
--
作者：
Wang Chao;Du Haifeng;Zhao Xuebing;Jin Chiming;Tian Mingliang;Zhang Yuheng;Che Renchao
磁性斯格明子是一种拓扑稳定的涡旋状自旋结构，为未来自旋电子器件的信息载体提供了广阔的前景。在二维手性磁体中，通常认为倾斜磁场对其形成和稳定性有害。在这里，我们通过使用高分辨率洛伦兹透射电子显微镜（洛伦兹 TEM）研究了 FeGe 纳米片中磁性斯格明子的角度依赖性稳定性。除了理论上预测当温度接近其磁居里温度 Tc∼278 K 时倾斜磁场会破坏斯格明子晶格态之外，我们还在圆锥形相和斯格明子相边界附近的中等温度下观察到了意想不到的类重入现象，Tt∼240 K。这种行为完全超出了传统二维（2D）系统的理论预测。相反，涉及圆锥相和斯格明子之间竞争的三维（3D）模型可能会发挥至关重要的作用。
The magnetic skyrmion is a topologically stable vortex-like spin texture that offers great promise as information carriers for future spintronic devices. In a two-dimensional chiral magnet, it was generally considered that a tilted magnetic field is harmful to its formation and stability. Here we investigated the angular-dependent stability of magnetic skyrmions in FeGe nanosheets by using high-resolution Lorentz transmission electron microscopy (Lorentz TEM). Besides the theoretically predicted destruction of skyrmion lattice state by an oblique magnetic field as the temperature closes to its magnetic Curie temperatureTc∼ 278 K, we also observed an unexpected reentry-like phenomenon at the moderate temperatures near the border between conical and skyrmion phase,Tt∼ 240 K. This behavior is completely beyond the theoretical prediction in a conventional two-dimensional (2D) system. Instead, a three-dimensional (3D) model involving the competition between conical phase and skyrmions is likely to play a crucial role.