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Noncollinear Magnetic Order in Two-Dimensional NiBr2 Films Grown on Au(111)
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-07 , DOI: 10.1021/acsnano.1c05221 Djuro Bikaljević 1, 2 , Carmen González-Orellana 3 , Marina Peña-Díaz 3 , Dominik Steiner 2 , Jan Dreiser 4 , Pierluigi Gargiani 5 , Michael Foerster 5 , Miguel Ángel Niño 5 , Lucía Aballe 5 , Sandra Ruiz-Gomez 5 , Niklas Friedrich 1 , Jeremy Hieulle 1 , Li Jingcheng 1 , Maxim Ilyn 3 , Celia Rogero 3, 6 , José Ignacio Pascual 1, 7
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-07 , DOI: 10.1021/acsnano.1c05221 Djuro Bikaljević 1, 2 , Carmen González-Orellana 3 , Marina Peña-Díaz 3 , Dominik Steiner 2 , Jan Dreiser 4 , Pierluigi Gargiani 5 , Michael Foerster 5 , Miguel Ángel Niño 5 , Lucía Aballe 5 , Sandra Ruiz-Gomez 5 , Niklas Friedrich 1 , Jeremy Hieulle 1 , Li Jingcheng 1 , Maxim Ilyn 3 , Celia Rogero 3, 6 , José Ignacio Pascual 1, 7
Affiliation
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Metal halides are a class of layered materials with promising electronic and magnetic properties persisting down to the two-dimensional limit. While most recent studies focused on the trihalide components of this family, the rather unexplored metal dihalides are also van der Waals layered systems with distinctive magnetic properties. Here we show that the dihalide NiBr2 grows epitaxially on a Au(111) substrate and exhibits semiconducting and magnetic behavior starting from a single layer. Through a combination of a low-temperature scanning-tunneling microscopy, low-energy electron diffraction, X-ray photoelectron spectroscopy, and photoemission electron microscopy, we identify two competing layer structures of NiBr2 coexisting at the interface and a stoichiometrically pure layer-by-layer growth beyond. Interestingly, X-ray absorption spectroscopy measurements revealed a magnetically ordered state below 27 K with in-plane magnetic anisotropy and zero-remanence in the single layer of NiBr2/Au(111), which we attribute to a noncollinear magnetic structure. The combination of such two-dimensional magnetic order with the semiconducting behavior down to the 2D limit offers the attractive perspective of using these films as ultrathin crystalline barriers in tunneling junctions and low-dimensional devices.
中文翻译：
Au(111) 上生长的二维 NiBr2 薄膜中的非共线磁序
金属卤化物是一类层状材料，具有在二维极限下持续存在的有前景的电子和磁性特性。虽然最近的研究集中在该族的三卤化物成分上，但尚未开发的金属二卤化物也是具有独特磁性的范德华层状系统。在这里，我们展示了二卤化物 NiBr 2在 Au(111) 衬底上外延生长，并从单层开始表现出半导体和磁性行为。通过低温扫描隧道显微镜、低能电子衍射、X射线光电子能谱和光发射电子显微镜的结合，我们确定了在界面共存的两种竞争的NiBr 2层结构和化学计量纯的层状结构。层生长超越。有趣的是，X射线吸收光谱测量揭示了单层NiBr 2 /Au(111)中27 K以下的磁有序状态，具有面内磁各向异性和零剩磁，我们将其归因于非共线磁结构。这种二维磁序与低至二维极限的半导体行为的结合提供了使用这些薄膜作为隧道结和低维器件中的超薄晶体势垒的有吸引力的前景。
更新日期：2021-09-28
中文翻译：
Au(111) 上生长的二维 NiBr2 薄膜中的非共线磁序
金属卤化物是一类层状材料，具有在二维极限下持续存在的有前景的电子和磁性特性。虽然最近的研究集中在该族的三卤化物成分上，但尚未开发的金属二卤化物也是具有独特磁性的范德华层状系统。在这里，我们展示了二卤化物 NiBr 2在 Au(111) 衬底上外延生长，并从单层开始表现出半导体和磁性行为。通过低温扫描隧道显微镜、低能电子衍射、X射线光电子能谱和光发射电子显微镜的结合，我们确定了在界面共存的两种竞争的NiBr 2层结构和化学计量纯的层状结构。层生长超越。有趣的是，X射线吸收光谱测量揭示了单层NiBr 2 /Au(111)中27 K以下的磁有序状态，具有面内磁各向异性和零剩磁，我们将其归因于非共线磁结构。这种二维磁序与低至二维极限的半导体行为的结合提供了使用这些薄膜作为隧道结和低维器件中的超薄晶体势垒的有吸引力的前景。
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