Abstract:Two-dimensional (2D) magnets with intrinsic ferromagnetic/antiferromagnetic (FM/AFM) ordering are highly desirable for future spintronic devices. However, the direct growth of their crystals is in its infancy. Here we report a chemical vapor deposition approach to controllably grow layered tetragonal and non-layered hexagonal FeTe nanoplates with their thicknesses down to 3.6 and 2.8 nm, respectively. Moreover, transport measurements reveal these obtained FeTe nanoflakes show a thickness-dependent magnetic tra… Show more
“…3d ), showing that the easy axis in the ultrathin 1T-CrTe 2 crystal is along the out-of-plane direction. The slope changes at ~0 T under a relatively lower temperature may be caused by the weak magnetic signal from the ultrathin samples 30 . Fig.…”
Section: Resultsmentioning
confidence: 99%
“…As a facile and industrially compatible method, chemical vapor deposition (CVD) has been widely used in the growth of 2D materials and the construction of their heterostructures 27 – 33 . Layered (such as VTe 2 31 ) and non-layered (such as FeTe 30 , Cr 2 S 3 32 , CrSe 33 , and ε-Fe 2 O 3 17 ) magnetic crystals have been successfully prepared using typical CVD methods. However, due to the uncertainty of the growth mechanism of 2D layered magnetic materials and the limited characterization of their magnetic properties, the controllable synthesis of 2D magnetic materials via CVD remains a cutting-edge topic.…”
Section: Introductionmentioning
confidence: 99%
“…Besides the challenges in sample fabrication, the poor environmental stability of the reported 2D magnetic materials also restricts the exploration of their exotic properties, and potential industrial applications 6 , 7 , 30 . Many atomically thin 2D magnets confront rapid degradation when exposed to air 7 , fatally limiting their potential applications.…”
The discovery of ferromagnetic two-dimensional van der Waals materials has opened up opportunities to explore intriguing physics and to develop innovative spintronic devices. However, controllable synthesis of these 2D ferromagnets and enhancing their stability under ambient conditions remain challenging. Here, we report chemical vapor deposition growth of air-stable 2D metallic 1T-CrTe2 ultrathin crystals with controlled thickness. Their long-range ferromagnetic ordering is confirmed by a robust anomalous Hall effect, which has seldom been observed in other layered 2D materials grown by chemical vapor deposition. With reducing the thickness of 1T-CrTe2 from tens of nanometers to several nanometers, the easy axis changes from in-plane to out-of-plane. Monotonic increase of Curie temperature with the thickness decreasing from ~130.0 to ~7.6 nm is observed. Theoretical calculations indicate that the weakening of the Coulomb screening in the two-dimensional limit plays a crucial role in the change of magnetic properties.
“…3d ), showing that the easy axis in the ultrathin 1T-CrTe 2 crystal is along the out-of-plane direction. The slope changes at ~0 T under a relatively lower temperature may be caused by the weak magnetic signal from the ultrathin samples 30 . Fig.…”
Section: Resultsmentioning
confidence: 99%
“…As a facile and industrially compatible method, chemical vapor deposition (CVD) has been widely used in the growth of 2D materials and the construction of their heterostructures 27 – 33 . Layered (such as VTe 2 31 ) and non-layered (such as FeTe 30 , Cr 2 S 3 32 , CrSe 33 , and ε-Fe 2 O 3 17 ) magnetic crystals have been successfully prepared using typical CVD methods. However, due to the uncertainty of the growth mechanism of 2D layered magnetic materials and the limited characterization of their magnetic properties, the controllable synthesis of 2D magnetic materials via CVD remains a cutting-edge topic.…”
Section: Introductionmentioning
confidence: 99%
“…Besides the challenges in sample fabrication, the poor environmental stability of the reported 2D magnetic materials also restricts the exploration of their exotic properties, and potential industrial applications 6 , 7 , 30 . Many atomically thin 2D magnets confront rapid degradation when exposed to air 7 , fatally limiting their potential applications.…”
The discovery of ferromagnetic two-dimensional van der Waals materials has opened up opportunities to explore intriguing physics and to develop innovative spintronic devices. However, controllable synthesis of these 2D ferromagnets and enhancing their stability under ambient conditions remain challenging. Here, we report chemical vapor deposition growth of air-stable 2D metallic 1T-CrTe2 ultrathin crystals with controlled thickness. Their long-range ferromagnetic ordering is confirmed by a robust anomalous Hall effect, which has seldom been observed in other layered 2D materials grown by chemical vapor deposition. With reducing the thickness of 1T-CrTe2 from tens of nanometers to several nanometers, the easy axis changes from in-plane to out-of-plane. Monotonic increase of Curie temperature with the thickness decreasing from ~130.0 to ~7.6 nm is observed. Theoretical calculations indicate that the weakening of the Coulomb screening in the two-dimensional limit plays a crucial role in the change of magnetic properties.
“…(D–I) The schematic growth process, atomic‐resolution scanning transmission electron microscope image, and the temperature‐dependent longitudinal sheet resistance ( R S – T ) of the tetragonal (D–F) and hexagonal (G–I) FeTe ultrathin films, respectively. Reproduced with permission: 2020, Springer Nature Limited 66 …”
Section: Intrinsic Magnetism In 2d Tmcsmentioning
confidence: 99%
“…Iron chalcogenides, another strongly correlated class of materials, have attracted much attention following the discovery of superconductivity in β ‐FeSe 72 (a PbO‐type phase belong to P4/nmm space group). Interesting magnetic properties have also been observed in hexagonal Fe 7 Se 8 , 73 and monoclinic Fe 3 Se 4 74 and FeTe 66 . However, the direct growth of their 2D crystals is lacking 75 .…”
The field of two‐dimensional (2D) magnets has expanded rapidly during the past several years since the first demonstration of intrinsic 2D magnetism in atomically thin CrI3 and Cr2Ge2Te6 in 2017. 2D transition metal chalcogenides (TMCs), a class of strongly correlated materials, have exhibited a wide variety of novel electronic and optical properties, and more recently magnetism. Here, we review recent experimental progress achieved in the growth of 2D magnetic TMC materials using chemical vapor deposition and molecular beam epitaxy methods. Outstanding examples include the demonstration of room temperature intrinsic and extrinsic ferromagnetism in monolayer VSe2, MnSe2, Cr3Te4, V‐doped WSe2, and so on. A brief discussion on the origin of the exotic magnetic properties and emergent phenomena is also presented. Finally, we summarize the remaining challenges and future perspective on the development of 2D magnetic materials for next‐generation spintronic devices.
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