Evolution of Novel Chiral Spin Textures in Fe/Gd Based Multilayer Thin Films
Evolution of Novel Chiral Spin Textures in Fe/Gd Based Multilayer Thin Films
复制标题
Fe/Gd 基多层薄膜中新型手性自旋织构的演变
DOI：
10.1017/s1431927622008960
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发表时间：
2022
影响因子：
2.8
通讯作者：
McMorran, Benjamin M
中科院分区：
文献类型：
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作者：
Parker, William S;Montoya, Sergio A;Fullerton, Eric E;McMorran, Benjamin M
诸如斯格明子和手性畴壁之类的磁自旋纹理由于其可能的自旋电子学应用而吸引了广泛的研究[1]。然而，斯格明子自旋结构和磁自旋纹理的直接表征提出了实验挑战。为了更好地了解它们的结构，我们使用洛伦兹透射电子显微镜 (LTEM) 来跟踪它们从经过充分研究的磁畴壁 (DW) 的演变。磁性斯格明子首先是由于存在于反演对称性破缺的材料中的 Dzyaloshinskii-Moriya 相互作用而被预测的 [2]。因此，斯格明子的大部分研究都集中在此类材料上。然而，拓扑等效的手性气泡或偶极斯格明子可以通过长程偶极子和短程畴壁能量之间的竞争在中心对称多层薄膜中稳定[3]。缺乏任何对称性破坏机制意味着这些材料中的自旋纹理不具有优选的手性，进一步扩展了可以观察到的纹理范围。
Magnetic spin textures such as skyrmions and chiral domain walls have attracted extensive study due to their possible spintronics applications [1]. However, direct characterization of the spin structure of skyrmions and magnetic spin textures poses an experimental challenge. To better understand their structure, we use Lorentz transmission electron microscopy (LTEM) to track their evolution from wellstudied magnetic domain walls (DWs).Magnetic skyrmions were first predicted as a result of the Dzyaloshinskii-Moriya interaction present in materials with broken inversion symmetry [2]. As a result, the bulk of skyrmion research has focused on such materials. However, topologically equivalent chiral bubbles, or dipole skyrmions, can be stabilized in centrosymmetric multilayer thin films by the competition between long-range dipole and short-range domain wall energies [3]. The lack of any symmetry-breaking mechanism means that spin textures in these materials have no preferred chirality, further extending the range of textures that can be observed.