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arXiv 2204.11348cond-mat.mes-hallcond-mat.mtrl-sci
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室温下层状Fe5GeTe2的Skyrmionic自旋结构

Skyrmionic Spin Structures in Layered Fe5GeTe2 Up To Room Temperature

Maurice Schmitt, Thibaud Denneulin, András Kovács, Tom G. Saunderson, Philipp Rüßmann, Aga Shahee, Tanja Scholz, Amir Tavabi, Martin Gradhand, Phivos Mavropoulo… 展开作者

Maurice Schmitt, Thibaud Denneulin, András Kovács, Tom G. Saunderson, Philipp Rüßmann, Aga Shahee, Tanja Scholz, Amir Tavabi, Martin Gradhand, Phivos Mavropoulos, Bettina Lotsch, Rafal Dunin-Borkowski, Yuriy Mokrousov, Stefan Blügel, Mathias Kläui

摘要:

晶格、温度和磁场对二维范德华磁体Fe5GeTe2中自旋结构形成的作用是一个关键的未解决的问题。使用洛伦兹透射电子显微镜,我们在实验上观察到的拓扑自旋结构,室温下的亚稳预冷和稳定后冷阶段的Fe5GeTe2。在宽的温度和磁场范围内,skyrmionic磁泡的形式没有优选的手性,这是一个中心对称的晶体结构的指示。在预冷阶段,这些气泡是可观察到的,即使没有一个外部字段的应用程序,而在后冷却阶段,从气泡域条纹域的转换被视为。为了理解Fe5GeTe2中的磁序,我们将宏观磁学表征结果与微观密度泛函理论计算进行了比较。我们的研究结果表明,即使在室温下,拓扑自旋结构可以稳定在中心对称范德华磁体。

英文摘要:

The role of the crystal lattice, temperature and magnetic field for the spin structure formation in the 2D van der Waals magnet Fe5GeTe2 is a key open question. Using Lorentz transmission electron microscopy, we experimentally observe topological spin structures up to room temperature in the metastable pre-cooling and stable post-cooling phase of Fe5GeTe2. Over wide temperature and field ranges, skyrmionic magnetic bubbles form without preferred chirality, which is indicative of a centrosymmetric crystal structure. In the pre-cooling phase, these bubbles are observable even without the application of an external field, while in the post-cooling phase, a transformation from bubble domains to stripe domains is seen. To understand the magnetic order in Fe5GeTe2 we compare macroscopic magnetometry characterization results with microscopic density functional theory calculation. Our results show that even up to room temperature, topological spin structures can be stabilized in centrosymmetric van der Waals magnets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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