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Magnetism in two-dimensional van der Waals materials.

TLDR
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.
Abstract
The discovery of materials has often introduced new physical paradigms and enabled the development of novel devices. Two-dimensional magnetism, which is associated with strong intrinsic spin fluctuations, has long been the focus of fundamental questions in condensed matter physics regarding our understanding and control of new phases. Here we discuss magnetic van der Waals materials: two-dimensional atomic crystals that contain magnetic elements and thus exhibit intrinsic magnetic properties. 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 our ability to control and investigate nanoscale phases. We present the theoretical background and motivation for investigating this class of crystals, describe the material landscape and the current experimental status of measurement techniques as well as devices, and discuss promising future directions for the study of magnetic van der Waals materials.

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Journal Article

Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe 3 GeTe 2

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

Magnetic 2D materials and heterostructures.

TL;DR: In this paper, the authors discuss the difference between magnetic states in 2D materials and in bulk crystals and present an overview of the 2D magnets that have been explored recently, focusing on the case of the two most studied systems-semiconducting CrI3 and metallic Fe3GeTe2.
Journal ArticleDOI

Magnetic 2D materials and heterostructures

TL;DR: The difference between magnetic states in 2D materials and in bulk crystals is discussed and the range of new van der Waals heterostructures that became possible with the appearance of 2D magnets are offered, offering new perspectives in this rapidly expanding field.
Journal ArticleDOI

Molecular magnetism: from chemical design to spin control in molecules, materials and devices

TL;DR: The field of molecular magnetism is rapidly evolving towards the use of magnetic molecules and molecule-based magnetic materials in physics-driven and nanotechnology-driven fields, in particular molecular spintronics, quantum technologies, metal-organic frameworks (MOFs) and 2D materials as discussed by the authors.
Journal ArticleDOI

Pressure-controlled interlayer magnetism in atomically thin CrI3.

TL;DR: In this paper, pressure-induced changes in the magnetic order of atomically thin van der Waals crystals are revealed and attributed to changes in stacking arrangement, and the interlayer ferromagnetic ground state is established in bulk CrI3 but not observed in native exfoliated thin films.
References
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Journal ArticleDOI

Van der Waals heterostructures

TL;DR: With steady improvement in fabrication techniques and using graphene’s springboard, van der Waals heterostructures should develop into a large field of their own.
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Ordering, metastability and phase transitions in two-dimensional systems

TL;DR: In this article, a new definition of order called topological order is proposed for two-dimensional systems in which no long-range order of the conventional type exists, and the possibility of a phase transition characterized by a change in the response of the system to an external perturbation is discussed in the context of a mean field type of approximation.
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Absence of Ferromagnetism or Antiferromagnetism in One- or Two-Dimensional Isotropic Heisenberg Models

TL;DR: In this paper, it is rigorously proved that at any nonzero temperature, a one- or two-dimensional isotropic spin-S$ Heisenberg model with finite-range exchange interaction can be neither ferromagnetic nor antiferromagnetic.
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Unconventional superconductivity in magic-angle graphene superlattices

TL;DR: The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle.
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Crystal statistics. I. A two-dimensional model with an order-disorder transition

TL;DR: In this article, the eigenwert problem involved in the corresponding computation for a long strip crystal of finite width, joined straight to itself around a cylinder, is solved by direct product decomposition; in the special case $n=\ensuremath{\infty}$ an integral replaces a sum.
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