磁性
材料科学
超顺磁性
范德瓦尔斯力
凝聚态物理
纳米团簇
碲化物
自旋电子学
磁化
纳米技术
磁场
化学
铁磁性
物理
有机化学
冶金
量子力学
分子
作者
Roger Guzmán,Shoucong Ning,Ruizi Zhang,Hongtao Liu,Yinhang Ma,Yu-Yang Zhang,Lihong Bao,Haitao Yang,Shixuan Du,Michel Bosman,Stephen J. Pennycook,Hong-Jun Gao,Wu Zhou
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-01-30
卷期号:17 (3): 2450-2459
被引量:1
标识
DOI:10.1021/acsnano.2c09762
摘要
Self-intercalation of native magnetic atoms within the van der Waals (vdW) gap of layered two-dimensional (2D) materials provides a degree of freedom to manipulate magnetism in low-dimensional systems. Among various vdW magnets, the vanadium telluride is an interesting system to explore the interlayer order-disorder transition of magnetic impurities due to its flexibility in taking nonstoichiometric compositions. In this work, we combine high-resolution scanning transmission electron microscopy (STEM) analysis with density functional theory (DFT) calculations and magnetometry measurements, to unveil the local atomic structure and magnetic behavior of V-rich V1+xTe2 nanoplates with embedded V3Te4 nanoclusters grown by chemical vapor deposition (CVD). The segregation of V intercalations locally stabilizes the self-intercalated V3Te4 magnetic phase, which possesses a distorted 1T'-like monoclinic structure. This phase transition is controlled by the electron doping from the intercalant V ions. The magnetic hysteresis loops show that the nanoplates exhibit superparamagnetism, while the temperature-dependent magnetization curves evidence a collective superspin-glass magnetic behavior of the nanoclusters at low temperature. Using four-dimensional (4D) STEM diffraction imaging, we reveal the formation of collective diffuse magnetic domain structures within the sample under the high magnetic fields inside the electron microscope. Our results shed light on the studies of dilute magnetism at the 2D limit and on strategies for the manipulation of magnetism for spintronic applications.
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