NANO LETTERS
·
2024
·
IF 9.6
Qitao Jiang,Huali Yang,Wuhong Xue,Ruilong Yang,Jianlei Shen,Xueying Zhang,Run-Wei Li,Xiaohong Xu
Two-dimensional (2D) ferromagnets have attracted widespread attention for promising applications in compact spintronic devices. However, the controlled synthesis of high-quality, large-sized, and ultrathin 2D magnets via facile, economical method remains challenging. Herein, we develop a hydrogen-tailored chemical vapor deposition approach to fabricating 2D Cr5Te8 ferromagnetic nanosheets. Interestingly, the time period of introducing hydrogen was found to be crucial for controlling the lateral size, and a Cr5Te8 single-crystalline nanosheet of lateral size up to ∼360 μm with single-unit-cell thickness has been obtained. These samples exhibit a leading role of domain wall nucleation in governing the magnetization reversal process, providing important references for optimizing the performances of associated devices. The nanosheets also show notable magnetotransport response, including nonmonotonous magnetic-field-dependent magnetoresistance and sizable anomalous Hall resistivity, demonstrating Cr5Te8 as a promising material for constructing high-performance magnetoelectronic devices. This study presents a breakthrough of large-sized CVD-grown 2D magnetic materials, which is indispensable for constructing 2D spintronic devices.
研究领域:
材料科学
·
凝聚态物理
·
自旋电子学
·
纳米材料
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2019
·Vol. 5
·期 10
·1900552
·
IF 6.312
Li Yang,Hao Wu,Wenfeng Zhang,Xun Lou,Zijian Xie,Xu Yu,Yuan Liu,Haixin Chang
Room temperature ferromagnetic semiconductors remain one of the most puzzling issues to be solved in tens of years. Nowadays, 2D ferromagnetic transition metal dichalcogenides (TMDCs) nanosheets attract continuous interest due to their exceptional electronic structure and properties. Here, it is identified that semiconducting 2H-phase MoTe 2 few/mono-layer mixed nanosheets present a room temperature ferromagnetic property with Curie temperature above 400 K, although the MoTe 2 bulk counterpart shows diamagnetic properties. The origin of such observed room temperature ferromagnetism is attributed to the combination of their structural defects including Te vacancies, disorders, and amorphous imperfections and edge-states caused by reduced dimensionality. Moreover, a distinct enhancement of ferromagnetic properties at room temperature is revealed by a non-magnetic Ta doping strategy. Such structural defects and edge-states modulated ferromagnetism offers a feasible strategy to search for more robust room temperature ferromagnetic TMDCs nanosheets, which is essential to explore novel electronic and spintronic devices where both carrier charge and spin freedom can be controlled.
研究领域:
凝聚态物理
·
材料科学
·
纳米科技
·
自旋电子学
·
半导体物理
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 8
·期 7
·2101383
·
IF 7.633
Changsheng Zhu,Bin Lei,Fanbao Meng,Jianhua Cui,Weizhuang Zhuo,Wenxiang Wang,Ziji Xiang,Xianhui Chen
Ferromagnetic order in 2D2D materials has triggered widespread interest because of their applications in spintronic devices. Monolayer 1T-VSe 2 , as a recently emerged candidate of 2D2D ferromagnetic material, exhibits complicated behaviors that contradict the theoretical predictions. In this work, a systematic investigation is presented on the evolution of the transport properties in VSe 2 thin flakes controlled by gate voltage. Notably, for the first time, a paramagnetic-to-ferromagnetic transition is realized in a VSe 2 thin flake using a field-effect transistor setup with solid ion conductor of polycrystalline Li 1+ x + y Al x (Ti 2− y Ge y )P 3− z Si z O 12 serving as the gate dielectric. The Curie temperature determined from the electrical transport measurements is ≈40 K. The electric-field-controlled ferromagnetism in exfoliated VSe 2 flakes provides an excellent platform for developing advanced spintronics as well as investigating unusual emergent physics in 2D systems.
研究领域:
凝聚态物理
·
材料科学
·
纳米电子学
·
自旋电子学
·
低维系统
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 14
·期 5
·1978-1989
·
IF 7.79
Denis M. Krichevsky,Lei Shi,Vladimir S. Baturin,Dmitry V. Rybkovsky,Yangliu Wu,Pavel V. Fedotov,Elena D. Obraztsova,Pavel O. Kapralov,Polina V. Shilina,Kayleigh Fung,Craig T. Stoppiello,Vladimir I. Belotelov,Andrei Khlobystov,Alexander I. Chernov
Molecular magnetism and specifically magnetic molecules have recently gained plenty of attention as key elements for quantum technologies, information processing, and spintronics. Transition to the nanoscale and implementation of ordered structures with defined parameters is crucial for advanced applications. Single-walled carbon nanotubes (SWCNTs) provide natural one-dimensional confinement that can be implemented for encapsulation, nanosynthesis, and polymerization of molecules into nanoribbons. Recently, the formation of atomically precise graphene nanoribbons inside SWCNTs has been reported. However, there have been only a limited amount of approaches to form ordered magnetic structures inside the nanotube channels and the creation of magnetic nanoribbons is still lacking. In this work we synthesize and reveal the properties of cobalt-phthalocyanine based nanoribbons (CoPcNRs) encapsulated in SWCNTs. Raman spectroscopy, transmission electron microscopy, absorption spectroscopy, and density functional theory calculations allowed us to confirm the encapsulation and to reveal the specific fingerprints of CoPcNRs. The magnetic properties were studied by transverse magnetooptical Kerr effect measurements, which indicated a strong difference in comparison with the pristine unfilled SWCNTs due to the impact of Co incorporated atoms. We anticipate that this approach of polymerization of encapsulated magnetic molecules inside SWCNTs will result in a diverse class of protected low-dimensional ordered magnetic materials for various applications.
研究领域:
纳米材料学
·
分子磁学
·
低维物理
·
自旋电子学
·
量子材料
·
凝聚态物理
✓ 已验证
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 45
·23266-23273
·
IF 6.895
Ying Zhang,Wenhui Wang,Meng Huang,Ping Liu,Guojing Hu,Chao Feng,Xueyan Lei,Meng Gu,Hongxin Yang,Kaihui Liu,Bin Xiang,Yalin Lu
Detection of the antiferromagnetic (AFM) state is an important issue for the application of two-dimensional (2D) antiferromagnets in spintronics, and interfacial exchange coupling is a highly efficient means to detect AFM order. However, there are no experimental reports of AFM state detection in van der Waals heterostructures, based on which 2D AFM spintronics can be developed. In this paper, we report a spin flop transition (SFT)-induced anomalous Hall effect in a heterostructure of MnPS3/graphite flake (GF) through van der Waals proximity coupling. The scaling behavior study and theoretical calculations confirm that the SFT in AFM MnPS3 can generate momentum-space nonzero Berry curvature integration in the adjacent GF. Our work opens a path for the realization of AFM state detection through the proximity effect in a stacking structure, thereby promoting the application of 2D antiferromagnets in future 2D spintronics.
研究领域:
凝聚态物理
·
自旋电子学
·
二维材料
·
磁性
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Jinshuang Zhu,Yexi Li,Ning Sui,Xiaochun Chi,Min Wu,Qiang Zhou,Hongwei Xiao,Hanzhuang Zhang,Yinghui Wang
The shape of nanocrystals can effectively adjust their photo-physical properties, which becomes a route to improve the nanocrystal-based semiconductor device. Herein, we further dig the photo-physical properties of CsPbBr 3 hexagonal nanocrystals (HNCs), in which CsPbBr 3 cubic nanocrystals (CNCs) serves as a reference. It is found that the activity of carrier in CsPbBr 3 HNCs is higher than that of CsPbBr 3 CNCs, owing to the slow energy dissipation path related to the phonon energy, which slows down the carrier temperature cooling process and accelerate the carrier recombination behavior simultaneously. Moreover, the spin flip process may occur in the CsPbBr 3 HNCs, whose lifetime is longer than that of CsPbBr 3 CNCs owing to the weakening of phonon scattering of Elliott-Yafet mechanism. In addition, the photoluminescence test of CsPbBr 3 HNCs in optical fiber microcavity shows that its light wave-guiding performance is determined by the self-absorption effect and the conventional light wave-guiding effect, which are both super to those of CsPbBr 3 CNCs, benefiting from its high PL quantum yield . Our research suggests that the CsPbBr 3 HNCs exhibits a huge potential in the field of optoelectronics , spintronics and photo-communication.
研究领域:
光电子学
·
纳米材料
·
自旋电子学
·
光子学
·
半导体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）