Benjamin Pestka, Jeff Strasdas, Gustav Bihlmayer, Adam Krzysztof Budniak, Marcus Liebmann, Niklas Leuth, Honey Boban, Vitaliy Feyer, Iulia Cojocariu, Daniel Baranowski, Simone Mearini, Yaron Amouyal, Lutz Waldecker, Bernd Beschoten, Christoph Stampfer, Lukasz Plucinski, Efrat Lifshitz, Peter Kratzer, Markus Morgenstern
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引用次数: 0
摘要
二维磁性材料可以实现有趣的磁性调整选项。例如,范德瓦耳斯材料 FePS3 是一种人字形层内反铁磁体,由于沿着不同的铁磁和反铁磁耦合方向存在不同的键长,因此表现出非常强的磁弹性耦合,从而实现了磁性能的弹性调整。长度变化的可能原因是铁原子的直接交换与通过 S 原子和 P 原子进行的超交换之间错综复杂的竞争。为了阐明这种相互作用,我们通过微米尺度的角分辨光电子能谱(ARPES)研究了剥离的 FePS3 在高于和低于奈尔温度 TN 时的能带结构。我们发现在 TN 温度范围内有三个特征性变化。根据与密度泛函理论计算(DFT + U)的比较,它们分别涉及 S 3p 型带、Fe 3d 型带和 P 3p 型带。这表明所有原子都参与了磁性相变,为错综复杂的交换路径提供了独立证据。
Identifying Band Structure Changes of FePS3 across the Antiferromagnetic Phase Transition
Magnetic 2D materials enable interesting tuning options of magnetism. As an example, the van der Waals material FePS3, a zig-zag-type intralayer antiferromagnet, exhibits very strong magnetoelastic coupling due to the different bond lengths along different ferromagnetic and antiferromagnetic coupling directions enabling elastic tuning of magnetic properties. The likely cause of the length change is the intricate competition between direct exchange of the Fe atoms and superexchange via the S and P atoms. To elucidate this interplay, we study the band structure of exfoliated FePS3 by μm scale ARPES (angular resolved photoelectron spectroscopy), both, above and below the Néel temperature TN. We found three characteristic changes across TN. They involve S 3p-type bands, Fe 3d-type bands and P 3p-type bands, respectively, as attributed by comparison with density functional theory calculations (DFT + U). This highlights the involvement of all the atoms in the magnetic phase transition providing independent evidence for the intricate exchange paths.
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.