Magnetism of two-dimensional chromium tellurides

Yang, Jiefu; Zhu, Chao; Deng, Ya; Tang, Bijun; Liu, Zheng

doi:10.1016/j.isci.2023.106567

Cited by 6 publications

(3 citation statements)

References 110 publications

(203 reference statements)

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“…This confinement can improve spin polarization and stabilize magnetic domains, both of which contribute to higher coercivity values [33]. Also, reduced dimensionality (2D) can result in increased magnetic anisotropy, making it more difficult for magnetic moments to switch orientation and therefore increasing coercivity [34]. As observed in TEM, the dislocation defects can also act as pinning sites for magnetic domains, resulting in higher coercivity.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Paramagnetic two-dimensional silicon-oxide from natural silicates

Mahapatra,

de Oliveira,

Costin

et al. 2023

2D Mater.

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Silicon dioxide’s potential for having magnetic properties is fascinating, as combining its electronic capabilities with magnetic response seems promising for spintronics. In this work, the mechanisms that drive the change from diamagnetic behavior in pure silicates like SiO2 to paramagnetic behavior in transition metal-doped silicates like Rhodonite silicate (CaMn3Mn(Si5O15)) are explored. This naturally occurring Rhodonite (R)-silicate was thinned down while retaining its magnetic properties by liquid-phase scalable exfoliation. Exfoliating R-silicate into the two-dimensional (2D) structure by LPE increases magnetic coercivity, and the internal resistance to demagnetization (ΔHc) up to ∼23.95 Oe compared to 7.08 Oe for its bulk phase. DFT spin-polarized calculations corroborate those findings and explain that the origin of the magnetic moment comes mainly from the Mn in the doped 2D silicate due to the asymmetrical components of the Mn d and Si p states in the valence band. This result is further illustrated by the spin component differential charge densities showing that Mn and Si atoms display a residual up spin charge. Rhodonite’s unusual magnetic behavior has considerable potential for spintronics, data storage, and sensing technologies. Understanding the complex relationships between the structural, magnetic, and electronic properties of silicates is essential for developing new materials and composites as well as for driving future research.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Paramagnetic two-dimensional silicon-oxide from natural silicates

Mahapatra,

de Oliveira,

Costin

et al. 2023

2D Mater.

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“…[18,19] These tellurides, with their T C around room temperature, stand out as potential highperformance candidates for spintronic devices. [20] Among them, 2D vdW CrTe 2 , known for its roomtemperature intrinsic ferromagnetism and pronounced perpendicular magnetic anisotropy, is essential for various spintronic devices. [14,[21][22][23][24] With decreasing thickness, CrTe 2 exhibits layer-dependent magnetic anisotropy transition and anomalous thickness dependence of T C .…”

Section: Introductionmentioning

confidence: 99%

“…[31,43] Depending on the Cr concentration, T C typically ranges from 180 K to 340 K across Cr x Te 2 variations, meanwhile, the easy axis orientation varies between the in-plane and the out-ofplane. [16,20,34,36,40,44] Exploring critical behaviors near the phase transition from paramagnetic to ferromagnetic states offers significant insights into magnetic interactions. These behaviors, described by statistical exponents β , γ, and δ , shed light on the critical temperature, spin dimensionality, and interaction range.…”

Section: Introductionmentioning

confidence: 99%

Critical behavior of quasi-two-dimensional ferromagnet Cr_1.04Te₂

Niu 钮,

Song 宋,

Chang 常

et al. 2024

Chinese Phys. B

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The self-intercalation of Cr into pristine two-dimensional (2D) van der Waals ferromagnetic CrTe2, which forms chromium tellurides (CrxTe2), has garnered interests due to their remarkable magnetic characteristics and the wide variety of chemical compositions available. Here, comprehensive basic characterization and magnetic studies are conducted on quasi-2D ferromagnetic Cr1.04Te2 crystals. Measurements of the isothermal magnetization curves are conducted around the critical temperature to systematically investigate the critical behavior. Specifically, the critical exponents β = 0.2399, γ = 0.8590, and δ = 4.3498, as well as the Curie temperature T C = 249.56 K, are determined using various methods, including a modified Arrott plots, the Kouvel-Fisher method, the Widom scaling method, and the critical isotherm analysis. These results indicate that the tricritical mean-field model accurately represents the critical behavior of Cr1.04Te2. A magnetic phase diagram with tricritical phenomenon is thus constructed. Further investigations confirmed that the critical exponents obtained conform to the scalar equation near T C, indicating their self-consistency and reliability. Our work sheds light on the magnetic properties of quasi-2D Cr1.04Te2, broadening the scope of the van der Waals crystals for developments of future spintronic devices operable at room temperature.

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Thickness‐Dependent Crystal Structure, Synthesis, and Magnetism of Thin Film Chromium Chalcogenides: A Review

Liu,

Gebredingle,

Guo

et al. 2024

Adv Funct Materials

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In the search for two‐dimensional (2D) magnets operating under ambient conditions, quasi‐2D non‐van der Waals (vdW) materials have attracted considerable research interest over the last five years. In addition to their high Curie temperature (TC), their superior air stability to that of vdW 2D magnets has made them potential candidates for future room‐temperature spintronics applications. Furthermore, recent progress in the thickness‐dependent crystal lattice and magnetic properties of non‐vdW Cr2X3 (X = S, Se, or Te) has brought them to areas that are once set aside for 2D vdW magnets in fundamental research and applications. Despite covalent bonding between magnetic layers, various bottom‐up synthesis methods produced thickness‐controlled flakes of Cr2X3. Moreover, layer‐dependent structural and magnetic properties are among the novel research directions in these materials. This review systematically summarizes recent studies on Cr2X3 crystal structure, their controllable synthesis, and their respective magnetic properties. A summary of some significant results on thickness‐controlled synthesis in Cr2X3 and thickness‐dependent magnetism in Cr2Te3 is presented. Additionally, experimental and theoretical reports are presented to explain interlayer magnetic interaction. The work reveals the interaction between synthesis, structure, and magnetism. Finally, future research directions of new Cr2X3‐based materials, rich magnetism in Cr2X3, and their potential application are discussed.

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Magnetism of two-dimensional chromium tellurides

Cited by 6 publications

References 110 publications

Paramagnetic two-dimensional silicon-oxide from natural silicates

Paramagnetic two-dimensional silicon-oxide from natural silicates

Critical behavior of quasi-two-dimensional ferromagnet Cr_1.04Te₂

Thickness‐Dependent Crystal Structure, Synthesis, and Magnetism of Thin Film Chromium Chalcogenides: A Review

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Magnetism of two-dimensional chromium tellurides

Cited by 6 publications

References 110 publications

Paramagnetic two-dimensional silicon-oxide from natural silicates

Paramagnetic two-dimensional silicon-oxide from natural silicates

Critical behavior of quasi-two-dimensional ferromagnet Cr1.04Te2

Thickness‐Dependent Crystal Structure, Synthesis, and Magnetism of Thin Film Chromium Chalcogenides: A Review

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Critical behavior of quasi-two-dimensional ferromagnet Cr_1.04Te₂