论文标题
高质量的外延薄膜和反铁磁性狄拉克半米FESN的交换偏差
High quality epitaxial thin films and exchange bias of antiferromagnetic Dirac semimetal FeSn
论文作者
论文摘要
FESN是由交替的FE3SN Kagome平面和蜂窝SN平面组成的拓扑半学（TSM）和Kagome Antiferromagnet（AFM）。这种独特的结构产生了频带结构中的异国特征，例如迪拉克锥和费米水平附近的悬挂板的共存，完全自旋的2D表面迪拉克费米子，以及通过重新定位NéelVector在Dirac锥中打开大间隙的能力。在这项工作中，我们报告了Magnetron溅射的高质量外延（0001）FESN膜的合成。使用FESN/PY异质结构，我们显示出巨大的交换偏差效应，在5 K时达到220 OE的交换场，提供了抗fiferromagnetism和强烈的层间交换偶联的明确证据。现场循环研究显示出陡峭的初始训练效果，突出了复杂的磁相互作用和各向异性。重要的是，我们的工作提供了一种简单，替代的方法来制造FESN膜和异质结构，从而更容易探索AFM TSM的拓扑物理学并开发基于FESN的Spintronics。
FeSn is a topological semimetal (TSM) and kagome antiferromagnet (AFM) composed of alternating Fe3Sn kagome planes and honeycomb Sn planes. This unique structure gives rise to exotic features in the band structures such as the coexistence of Dirac cones and flatbands near the Fermi level, fully spin-polarized 2D surface Dirac fermions, and the ability to open a large gap in the Dirac cone by reorienting the Néel vector. In this work, we report the synthesis of high quality epitaxial (0001) FeSn films by magnetron sputtering. Using FeSn/Py heterostructures, we show a large exchange bias effect that reaches an exchange field of 220 Oe at 5 K, providing unambiguous evidence of antiferromagnetism and strong interlayer exchange coupling in our films. Field cycling studies show steep initial training effects, highlighting the complex magnetic interactions and anisotropy. Importantly, our work provides a simple, alternative means to fabricate FeSn films and heterostructures, making it easier to explore the topological physics of AFM TSMs and develop FeSn-based spintronics.
