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Summary: This paper investigates the magnetic phase transition behavior of the epitaxial Cr4Te5 thin film and discovers the existence of magnetic disorders and quasi-2D long-range magnetic interaction in the film. Furthermore, the itinerant ferromagnetic nature of the Cr4Te5 film is confirmed by the Takahashi's self-consistent renormalization theory of spin fluctuations.
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(2023)
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(2023)
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Huan Zheng et al.
Summary: In this paper, the growth of 2D CrTe2 single-crystal films on Al2O3 substrates using pulsed laser deposition is reported. The films exhibit a typical paramagnetic-ferromagnetic phase transition around 200 K, with a high Curie temperature. The saturation magnetization reaches 73.64 emu/g for a film thickness of 30 nm. Furthermore, electronic transport measurement confirms that the CrTe2 film displays metallic behavior in the temperature range of 5 K <= T <= 320 K with a resistivity of 1.5 m omega/cm. First-principles calculation reveals that the ferromagnetic ordering is mainly due to exchange coupling of adjacent Cr-spin t(2g) polarized electrons, and the metallic conductivity arises from p-d orbital hybridization between Cr and Te atoms. This work provides new insights for studying large-scale growth of 2D magnets and developing room temperature 2D magnet-based nanodevices.
APPLIED PHYSICS LETTERS
(2023)
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Hao Liu et al.
Summary: In this article, the critical behavior of the cubic Laves crystalline binary intermetallic compound ErNi2 near its second-order ferromagnetic to paramagnetic transition is analyzed. The second-order nature of the transition is confirmed by the normalized thermal dependencies of the magnetic entropy change curves and the Banerjee criterion. By comparing the normalized slopes, the Tricritical mean-field model is found to be the best model to calculate the critical exponent value of ErNi2. Using the modified Arrott plots, the final critical exponents are determined to be beta = 0.164(2) and gamma = 0.821(9), which closely match the Tricritical mean-field model with some slight differences. The accuracy and reliability of these exponents are further confirmed by the Widom scaling relation and the scaling hypothesis.
MATERIALS RESEARCH BULLETIN
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Summary: The study successfully synthesized air-stable 2D Cr5Te8 ultrathin crystals with tunable thickness using tube-in-tube CVD growth technology, showing good stability. By adjusting the growth temperature, the thickness of Cr5Te8 nanosheets can be precisely tuned with ferromagnetic properties, providing a robust method for the controllable synthesis of high-quality 2D ferromagnetic materials and facilitating research progress in spintronics.
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(2022)
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Summary: The 2D layered Cr4Te5 epitaxial films prepared by pulsed laser deposition technique exhibit ferromagnetic ordering state up to 300 K and easily achieve epitaxial growth along a single orientation of the hexagonal Al2O3 (0001) substrate.
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Shasha Sun et al.
Summary: Chromium tellurides have unique properties that make them suitable for spintronic applications. The anisotropic magnetoresistance (AMR) behavior of ferromagnetic CrTe single crystal flakes shows promising potential for spintronics applications, with the AMR ratio increasing at lower temperatures.
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Summary: The chemical vapor transport method was used to grow ferromagnetic Cr5Te6 single crystal in this study. Multiple magnetic phase transitions were discovered, and the critical behavior from ferromagnetism to paramagnetism transition was investigated in detail. The critical parameters and Curie point were determined by theoretical models, and the spin interaction for Cr5Te6 was found to be long-range type with a decay in distance.
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(2022)
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Hari Padmanabhan et al.
Summary: This study provides evidence for interlayer magnetophononic coupling in layered magnetic topological insulator MnBi2Te4. The anomalies in phonon scattering intensities across magnetic field-driven phase transitions are observed using magneto-Raman spectroscopy, which is attributed to phonons modulating the interlayer exchange coupling. The signatures of magnetophononic coupling are also observed in the time domain through ultrafast excitation and detection of coherent phonons.
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Summary: In this study, we synthesized 2D Cr3Te4 nanosheets with excellent environmental stability and thickness-dependent ferromagnetic behavior. Transmission electron microscopy revealed the existence of topologically nontrivial magnetic-spin states in the ultrathin Cr3Te4 nanosheets, which can transform into biskyrmion bubbles when subjected to an external magnetic field. These findings hold promise for the design of magnetic memory storage, sensors, and spintronics.
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Michaela Sojkova et al.
Summary: Few-layer PtSe2 films are promising candidates for high-speed electronics, spintronics, and photodetectors. The study found that growth temperature significantly influences the structural and electrical properties of the films. The best results were achieved for PtSe2 layers grown at 600 degrees Celsius, exhibiting long-range in-plane ordering.
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NATURE COMMUNICATIONS
(2021)
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Hao Wu et al.
Summary: A scalable method has been developed to prepare freestanding non-van der Waals ultrathin 2D crystals, leading to the discovery of strong, ambient-air-robust room-temperature ferromagnetism in freestanding non-van der Waals 2D CrTe crystals. These freestanding 2D CrTe crystals show comparable or even better ferromagnetic properties than commonly used Fe, Co, Ni, and BaFe12O19, making them promising as new platforms for intrinsically ferromagnetic 2D crystals at room temperature and integrated 2D devices.
NATURE COMMUNICATIONS
(2021)
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Xiaoqian Zhang et al.
Summary: Growth and properties of single- and few-layer CrTe2 on bilayer graphene by molecular beam epitaxy (MBE) have shown intrinsic ferromagnetism with a Curie temperature up to 300 K and perpendicular magnetic anisotropy, providing a new avenue for developing large-scale 2D magnet-based spintronics devices.
NATURE COMMUNICATIONS
(2021)
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Yu Zhang et al.
Summary: This review discusses the potential applications of 2D van der Waals materials and their heterostructures in the spintronics field, focusing on the long-range magnetic order, property manipulation methods, and spintronic devices based on magnetic 2D vdWs materials. The review provides comprehensive insights for the development of novel spintronic applications utilizing these materials.
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FRONTIERS OF PHYSICS
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Summary: Research on two-dimensional materials has been rapidly increasing in the past seventeen years, starting from graphene and expanding into a diverse family with unique structures and properties, making them attractive candidates for various applications. Major breakthroughs have been made in the last five years in developing synthetic methods, exploring new properties, identifying innovative applications, and pushing for commercialization in the field of 2D materials.
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Summary: The critical phenomenon of magnetic phase transition in the van der Waals itinerant ferromagnet Fe4GeTe2 was investigated, revealing specific critical exponents during the continuous paramagnetic to ferromagnetic transition. The analysis suggests a quasi-two-dimensional itinerant magnetism in Fe4GeTe2 single crystal, with a certain magnetic anisotropy present.
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