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Article
Physics, Multidisciplinary
Xiangyan Bo et al.
Summary: In this study, a comprehensive investigation on both bulk and monolayer CrSBr is conducted using the first-principles linear-response method. It is confirmed that the ground state of bulk CrSBr is A-type antiferromagnetic, and there are sizable intralayer exchange interactions with small magnetic frustration. The significant electron doping effect and strain effect are demonstrated, with increased Curie temperature for monolayer CrSBr and an antiferromagnetic-to-ferromagnetic phase transition for bulk CrSBr. The magnon spectra are also calculated using linear spin-wave theory. These features of CrSBr can help clarify the microscopic magnetic mechanism and promote its application in spintronics.
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(2023)
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Julian Klein et al.
Summary: In this study, it was found that the magnetic semiconductor CrSBr behaves like a quasi-1D material in a magnetically ordered environment. The strong 1D electronic character of CrSBr originates from the Cr-S chains and the weak interlayer hybridization, leading to anisotropy in effective mass and dielectric screening. Moreover, CrSBr hosts spectrally narrow excitons of high binding energy and oscillator strength due to reduced dimensionality and interlayer coupling. Overall, CrSBr is an experimentally attractive candidate for the study of exotic exciton and 1D-correlated many-body physics.
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Fan Wu et al.
Summary: Investigation on electronic transport through exfoliated multilayers of CrSBr, a 2D semiconductor, revealed a pronounced anisotropy along the crystallographic directions. The observed phenomenology and the detection of a 1D van Hove singularity in energy-resolved photocurrent measurements suggest that CrSBr exhibits quasi-1D electronic transport properties, unlike conventional 2D doped semiconductors.
ADVANCED MATERIALS
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Evan J. Telford et al.
Summary: Tunable electron transport is demonstrated within the magnetic phase of the 2D semiconductor CrSBr, revealing a strong coupling between its magnetic order and charge transport. The magnetoresistance can be dynamically and reversibly tuned by varying the carrier concentration, providing a mechanism for controlling charge transport in 2D magnets.
Article
Chemistry, Physical
Yusheng Hou et al.
Summary: Two-dimensional van der Waals Janus materials and their heterostructures have the potential to design various functionalities. In this study, high T-C ferromagnetic semiconductors with out-of-plane magnetization were found in CrSX (X = Cl, Br, I) through systematic first-principles studies. Furthermore, large-gap quantum anomalous Hall effect and sizable valley splitting can be achieved in van der Waals heterostructures CrSBr/Bi2Se3/CrSBr and MoTe2/CrSBr, respectively, through the magnetic proximity effect. Additionally, skyrmion states were observed in CrTeX (X = Cl, Br, I) under external magnetic fields due to large Dzyaloshinskii-Moriya interactions. The multifunctionalities of two-dimensional Janus magnet Cr-based dichalcogenide halides in topological electronic and valleytronic devices were demonstrated.
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Allen Scheie et al.
Summary: An experimental study is conducted to determine the magnetic exchange Hamiltonian and bulk magnon spectrum of CrSBr, an air-stable 2D van der Waals semiconducting magnet. The study confirms the A-type antiferromagnetic order using single crystal neutron diffraction and measures magnon dispersions using inelastic neutron scattering. The fitted exchange Hamiltonian enables theoretical predictions, such as the presence of chiral magnon edge modes in a spin-orbit enhanced CrSBr heterostructure.
Article
Chemistry, Multidisciplinary
Carla Boix-Constant et al.
Summary: 2D magnetic materials, particularly CrSBr, exhibit interesting magnetic properties and offer potential applications in spintronics and magnonics. The magneto-transport properties of CrSBr vertical heterostructures in the 2D limit are investigated, revealing low-dimensional characteristics and spin-valve behavior. CrSBr monolayer/bilayer serves as an excellent platform for studying and controlling field-induced phenomena in two dimensions.
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(2022)
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Dorye L. Esteras et al.
Summary: The recent isolation of two-dimensional magnets has opened up exciting possibilities for spintronics and magnonics in miniaturization. Atomically thin materials have outstanding deformation capacity, which allows their properties to be controlled through strain engineering. In this study, the magnetic properties, magnon dispersion, and spin dynamics of the air-stable 2D magnetic semiconductor CrSBr under mechanical strain were investigated using first-principles calculations. The results provide a detailed analysis of the competing interactions that stabilize the long-range ferromagnetic order in the monolayer. It is shown that the magnon dynamics of CrSBr can be selectively modified along different crystallographic directions by applied strain, indicating the potential of this quasi-1D electronic system for magnon straintronics applications. Additionally, a 30% increase in TC, which allows spin waves to propagate at higher temperatures, is predicted to be driven by strain.
Article
Multidisciplinary Sciences
J. Klein et al.
Summary: Van der Waals magnetic materials consist of atomically thin magnetically ordered layers. In this study, the researchers demonstrate nanoscale structural control in the layered magnet CrSBr by using an electron beam, which could lead to the creation of spin textures and quantum magnetic phases.
NATURE COMMUNICATIONS
(2022)
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R. Caglayan et al.
Summary: In this study, the absorption of F and Cl on ferromagnetic monolayer CrN was investigated using first-principles calculations. It was found that the magnetic properties of CrN can be altered after the adsorption of F and Cl, opening a route to the detection of these gases using magnetic or optical measurements.
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(2022)
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D. Soriano et al.
Summary: By down-folding Hubbard models from ab initio calculations, this study uncovers the microscopic origin of magnetism in the CrI3 monolayer, identifying a multi-orbital super-exchange mechanism as the key factor. The research also demonstrates how environmental screening, such as encapsulation with hexagonal boron nitride, affects the Coulomb interaction and subsequently controls the magnetic properties. The interplay between different exchange interactions influences the magnon dispersion and the Curie temperature in a non-trivial manner.
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Kihong Lee et al.
Summary: The discovery of ferromagnetic ordering in monolayers of CrSBr, as well as the antiferromagnetic coupling in multilayers, highlights the unique magnetic properties of this 2D material. The Neel temperature of CrSBr increases with decreasing layer number, setting it apart from other 2D magnets. These findings introduce CrSBr as an exciting 2D magnetic semiconductor with potential applications in magnetic-electronic coupling and toroidal moments.
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S. Memarzadeh et al.
Summary: The study focuses on the origin of in-plane ferromagnetism in monolayer VSe2, showing a transition to a ferromagnetic state under moderate charge doping and revealing long-range magnetic order above 300 K. This suggests the possibility of controllable manipulation of magnetic properties in experimentally available samples.
Article
Chemistry, Physical
Nathan P. Wilson et al.
Summary: Interlayer hybridization in 2D van der Waals materials can change their properties, such as the coupling in CrSBr which can be changed by switching the magnetic order. The stacking of monolayers of 2D materials can introduce new properties, like moire bands and highly correlated electronic states.
Article
Materials Science, Multidisciplinary
Ke Yang et al.
Summary: The study using first-principles calculations and Monte Carlo simulations investigates the electronic structure and magnetic properties of CrSBr in bulk and monolayer forms. Bulk CrSBr is found to be a magnetic semiconductor with a triaxial magnetic anisotropy, attributed to the joint effects of spin-orbit coupling and magnetic dipole-dipole interaction. The monolayer of CrSBr shows persistent intralayer ferromagnetic exchange and a stronger contribution of shape anisotropy to the magnetic anisotropy. Monte Carlo simulations predict a Curie temperature of 175 K for the CrSBr monolayer, with the potential for further increasing the temperature by applying a uniaxial tensile or compressive strain along specific axes.
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