Journal ArticleDOI
Decomposition-Induced Room-Temperature Magnetism of the Na-Intercalated Layered Ferromagnet Fe3-xGeTe2.
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TLDR
This work highlights the importance of strain and electronic control for manipulating the Curie temperature in 2D ferromagnets, while emphasizing the need for careful chemical analysis when exploring phenomena in exfoliated layers.Abstract:
The creation of 2D van der Waals materials with ferromagnetism above room temperature is an essential goal toward their practical utilization in spin-based applications. Recent studies suggest that intercalating lithium in exfoliated flakes of the ferromagnet Fe3-xGeTe2 induces a nonzero magnetization at T ∼ 300 K. However, the nanoscale nature of such experiments precludes precise observations of structural and chemical changes upon intercalation. Here, we report the preparation of sodium-intercalated NaFe2.78GeTe2 as well as the investigation into its structure and magnetic properties. Sodium readily intercalates into the van der Waals gap, as revealed by synchrotron X-ray diffraction. Concurrently, the Fe2.78GeTe2 layer becomes heavily charge doped and strained via chemical pressure, yet retains its structure and ferromagnetic transition temperature of ∼140 K. However, we observe the presence of a ferromagnetic amorphous iron germanide impurity over a wide range of synthetic conditions, leading to room-temperature magnetization. This work highlights the importance of strain and electronic control for manipulating the Curie temperature in 2D ferromagnets, while emphasizing the need for careful chemical analysis when exploring phenomena in exfoliated layers.read more
Citations
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Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe 3 GeTe 2
Yujun Deng,Yijun Yu,Yichen Song,Jingzhao Zhang,Naizhou Wang,Zeyuan Sun,Yangfan Yi,Yizheng Wu,Shiwei Wu,Junyi Zhu,Jing Wang,Xianhui Chen,Yuanbo Zhang +12 more
TL;DR: In this paper, it was shown that the itinerant ferromagnetic order persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy.
Journal ArticleDOI
Emergent phenomena and proximity effects in two-dimensional magnets and heterostructures.
TL;DR: This Review summarizes recent progress in exploring the intrinsic magnetism of atomically thin van der Waals materials, manipulation of their magnetism by tuning the interlayer coupling, and device structures for spin- and valleytronic applications.
Journal ArticleDOI
Recent progress on 2D magnets: Fundamental mechanism, structural design and modification
TL;DR: In this article, the essential progress on 2D magnetology is reviewed, with an emphasis on the current understanding of the magnetic exchange interaction, the databases of 2D magnets, and the modification strategies for modulation of magnetism.
Journal ArticleDOI
Transition from Ferromagnetic Semiconductor to Ferromagnetic Metal with Enhanced Curie Temperature in Cr2Ge2Te6 via Organic Ion Intercalation.
Naizhou Wang,Huai-Bao Tang,M. Z. Shi,Hui Zhang,W. Z. Zhuo,Da-Yong Liu,F. B. Meng,L. K. Ma,Jianjun Ying,Liang-Jian Zou,Zhe Sun,Xianhui Chen +11 more
TL;DR: These findings are the first demonstration of manipulation of magnetism in magnetic van der Waals materials by means of intercalating organic ions, which can serve as a convenient and efficient approach to explore versatile magnetic and electronic properties in van Der Waals crystals.
Journal ArticleDOI
Intercalation as a versatile tool for fabrication, property tuning, and phase transitions in 2D materials
Manthila Rajapakse,Bhupendra Karki,Usman O. Abu,Sahar Pishgar,Rajib Khan Musa,S. M. Shah Riyadh,Ming Yu,Gamini Sumanasekera,Jacek B. Jasinski +8 more
TL;DR: A comprehensive review of various roles and applications of intercalation in next-generation energy storage, optoelectronics, thermoelectrics, and catalysis can be found in this article.
References
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Journal ArticleDOI
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit
Bevin Huang,Genevieve Clark,Efrén Navarro-Moratalla,Dahlia R. Klein,Ran Cheng,Kyle L. Seyler,Ding Zhong,E. R. Schmidgall,Michael A. McGuire,David Cobden,Wang Yao,Di Xiao,Pablo Jarillo-Herrero,Xiaodong Xu +13 more
TL;DR: Xu et al. as mentioned in this paper used magneto-optical Kerr effect microscopy to show that monolayer chromium triiodide (CrI3) is an Ising ferromagnet with out-of-plane spin orientation.
Journal ArticleDOI
Chemical Redox Agents for Organometallic Chemistry
TL;DR: 1. Advantages and disadvantages of Chemical Redox Agents, 2. Reversible vs Irreversible ET Reagents, 3. Categorization of Reagent Strength.
Journal ArticleDOI
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals
Cheng Gong,Lin Li,Zhenglu Li,Huiwen Ji,Alexander Stern,Yang Xia,Ting Cao,Wei Bao,Chenzhe Wang,Yuan Wang,Ziqiang Qiu,Robert J. Cava,Steven G. Louie,Jing Xia,Xiang Zhang +14 more
TL;DR: In this paper, the authors reported the experimental discovery of intrinsic ferromagnetism in Cr 2 Ge 2 Te 6 atomic layers by scanning magneto-optic Kerr microscopy.
Journal ArticleDOI
Gate-tunable room-temperature ferromagnetism in two-dimensional Fe 3 GeTe 2 .
Yujun Deng,Yujun Deng,Yijun Yu,Yijun Yu,Yichen Song,Yichen Song,Jingzhao Zhang,Naizhou Wang,Naizhou Wang,Zeyuan Sun,Zeyuan Sun,Yangfan Yi,Yangfan Yi,Yizheng Wu,Yizheng Wu,Shiwei Wu,Shiwei Wu,Junyi Zhu,Jing Wang,Jing Wang,Xianhui Chen,Xianhui Chen,Yuanbo Zhang,Yuanbo Zhang +23 more
TL;DR: It is found that the itinerant ferromagnetism persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy, which opens up opportunities for potential voltage-controlled magnetoelectronics based on atomically thin van der Waals crystals.
Journal ArticleDOI
Magnetism in two-dimensional van der Waals materials.
TL;DR: These cleavable materials provide the ideal platform for exploring magnetism in the two-dimensional limit, where new physical phenomena are expected, and represent a substantial shift in the authors' ability to control and investigate nanoscale phases.