2D ferromagnetism at finite temperatures under quantum scrutiny
arXiv:2006.03287 · doi:10.1063/5.0015619
Abstract
Recent years have seen a tremendous rise of two-dimensional (2D) magnetic materials, several of which verified experimentally. However, most of the theoretical predictions to date rely on ab-initio methods, at zero temperature and fluctuations-free, while one certainly expects detrimental quantum fluctuations at finite temperatures. Here we present the solution of the quantum Heisenberg model for honeycomb/hexagonal lattices with anisotropic exchange interaction up to third nearest neighbors and in an applied field in arbitrary direction, that answers the question whether long-range magnetization can indeed survive in the ultrathin limit of materials, up to which temperature, and what the characteristic excitation (magnon) frequencies are, all essential to envisaged applications of magnetic 2D materials. We find that long-range magnetic order persists at finite temperature for materials with overall easy-axis anisotropy. We validate the calculations on the examples of monolayer CrI3, CrBr3 and MnSe2. Moreover, we provide an easy-to-use tool to calculate Curie temperatures of new 2D computational materials.
arXiv comment14 pages, 5 figures. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 117, 052401 (2020) and may be found at https://doi.org/10.1063/5.0015619
References in corpus (18)
- Spintronics: Fundamentals and applications
- Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
- Magnetic 2D materials and heterostructures
- Room Temperature Intrinsic Ferromagnetism in Epitaxial Manganese Selenide Films in the Monolayer Limit
- Direct photoluminescence probing of ferromagnetism in monolayer two-dimensional CrBr3
- Topological spin excitations in honeycomb ferromagnet CrI
- Reconfigurable nano-scale spin-wave directional coupler
- Experimental prototype of a spin-wave majority gate
- A first theoretical realization of honeycomb topological magnon insulator
- Spirit: Multifunctional Framework for Atomistic Spin Simulations
- Many-body Green's function theory of Heisenberg films
- Dirac magnons in honeycomb ferromagnets
- Micromagnetometry of two-dimensional ferromagnets
- Calculating critical temperatures for ferromagnetic order in two-dimensional materials
- SQUID-on-tip with single-electron spin sensitivity for high-field and ultra-low temperature nanomagnetic imaging
- Magnetic properties of quantum Heisenberg ferromagnets with long-range interactions
- Nanowire magnetic force sensors fabricated by focused electron beam induced deposition
- Anisotropic bulk and planar Heisenberg ferromagnets in uniform, arbitrarily oriented magnetic fields
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