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• W3100283249 endingPage "053012" @default.
• W3100283249 startingPage "053012" @default.
• W3100283249 abstract "The latest discovery of ferromagnetism in atomically thin films of semiconductors Cr$_2$Ge$_2$Te$_6$ and CrI$_3$ has unleashed numerous opportunities for fundamental physics of magnetism in two-dimensional (2D) limit and also for technological applications based on 2D magnetic materials. In this paper, we present a comprehensive theoretical study of the magnetic, electronic, optical and magneto-optical(MO) properties of multilayers [monolayer(ML), bilayer and trilayer] and bulk CrI$_3$, based on the density functional theory with the generalized gradient approximation plus on-site Coulomb repulsion scheme. Interestingly, all the structures are found to be single-spin ferromagnetic(FM) semiconductors. They all have a large out-of-plane magnetic anisotropy energy(MAE) of $sim$0.5 meV/Cr. These large MAEs suppress transverse spin fluctuations and thus stabilize long-range magnetic orders at finite temperatures down to the ML limit. They also exhibit strong MO effects with their Kerr and Faraday rotation angles being comparable to that of best-known bulk MO materials. The shape and position of the main features in the optical and MO spectra are found to be nearly thickness-independent although the magnitude of Kerr rotation angles increases monotonically with the film thickness. Magnetic transition temperatures estimated based on calculated exchange coupling parameters, calculated optical conductivity, MO Kerr and Faraday rotation angles agree quite well with available experimental data. The calculated MAE as well as optical and MO properties are analyzed in terms of the calculated orbital-decomposed densities of states, band state symmetries and dipole selection rules. Our findings of large out-of-plane MAEs and strong MO effects in these single-spin FM semiconducting CrI$_3$ ultrathin films suggest that they will find valuable applications in semiconductor MO and spintronic nanodevices." @default.
• W3100283249 created "2020-11-23" @default.
• W3100283249 creator A5003464349 @default.
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• W3100283249 date "2019-05-01" @default.
• W3100283249 modified "2023-09-30" @default.
• W3100283249 title "Magnetism and magneto-optical effects in bulk and few-layer CrI₃: a theoretical GGA + U study" @default.
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• W3100283249 doi "https://doi.org/10.1088/1367-2630/ab1ae9" @default.
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