Two-dimensional square-pyramidal VO<sub>2</sub> with tunable electronic properties

Tang, Zhen‐Kun; Li, Xibo; Zhang, Deng-Yu; Zhang, Yanning; Liu, Li-Min

doi:10.1039/c4tc02938k

Cited by 22 publications

(18 citation statements)

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“…2 It is well-known that the strain is widely used to induce and engineer the electronic structures and magnetic property of 2D layered materials. 19,[33][34][35] Thus, it is desirable to know whether the strain can effectively tune magnetic behavior of the monolayer Ni(OH) 2 . Here, we investigate the strain effect on the magnetic properties of the monolayer Ni(OH) 2 by varying the biaxial strain from À10% to 10%.…”

Section: Resultsmentioning

confidence: 99%

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Tunable band gap and magnetism of the two-dimensional nickel hydroxide

et al. 2015

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Section: Resultsmentioning

confidence: 99%

“…32 Several groups have reported the strain-controlled magnetism in pristine 2D materials. 19,[33][34][35] Thus, the unusual electronic and magnetic properties of the pristine monolayer Ni(OH) 2 may exist under the strain condition.…”

Section: Introductionmentioning

confidence: 99%

Tunable band gap and magnetism of the two-dimensional nickel hydroxide

et al. 2015

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“…However, significant magnetism is rarely observed in experiment due to the delocalization of s and p orbitals in carbon materials. Alternatively, 2D inorganic graphene-like crystals, such as transition metal dichalcogenides, − oxides, − nitrides, , carbide, − halide, , silicide, − and complex ternary compounds, − present great opportunities in spintronics applications for the possible existence of d orbital itinerant magnetism transition metal atoms and coupling between them.…”

Section: Methodsmentioning

confidence: 99%

Room-Temperature Ferromagnetism in Two-Dimensional Fe₂Si Nanosheet with Enhanced Spin-Polarization Ratio

et al. 2017

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Searching experimental feasible two-dimensional (2D) ferromagnetic crystals with large spin-polarization ratio, high Curie temperature and large magnetic anisotropic energy is one key to develop next-generation spintronic nanodevices. Here, 2D FeSi nanosheet, one counterpart of Hapkeite mineral discovered in meteorite with novel magnetism is proposed on the basis of first-principles calculations. The 2D FeSi crystal has a slightly buckled triangular lattice with planar hexacoordinated Si and Fe atoms. The spin-polarized calculations with hybrid HSE06 function method indicate that 2D FeSi is a ferromagnetic half metal at its ground state with 100% spin-polarization ratio at Fermi energy level. The phonon spectrum calculation and ab initio molecular dynamic simulation shows that 2D FeSi crystal has a high thermodynamic stability and its 2D lattice can be retained at the temperature up to 1200 K. Monte Carlo simulations based on the Ising model predict a Curie temperature over 780 K in 2D FeSi crystal, which can be further tuned by applying a biaxial strain. Moreover, 2D structure and strong in-plane Fe-Fe interaction endow FeSi nanosheet sizable magnetocrystalline anisotropy energy with the magnitude of at least two orders larger than those of Fe, Co and Ni bulks. These novel magnetic properties render the 2D FeSi crystal a very promising material for developing practical spintronic nanodevices.

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“…A sequence that resembles the targeted compounds is evaporated onto a silicon substrate with the correct stoichiometric and thickness ratio of the final compounds. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) were synthesized using similar conditions. For each sample (([SnSe] 1.16 ) m (NbSe 2 ) 2 ), m layers of SnSe (m = 1-20) and two layers of NbSe 2 were repeatedly deposited until a thickness of ~ 50 nm was reached.…”

Section: Synthesis and Structurementioning

confidence: 99%

Charge transfer vs. dimensionality: what affects the transport properties of ferecrystals?

Alemayehu

Falmbigl

et al. 2015

Nanoscale

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A series of ([SnSe]1+δ)m(NbSe2)2 compounds with two layers of NbSe2 separated by m bilayers of SnSe, where 1 ≤ m ≤ 20, were prepared from modulated precursors by systematically changing the number of SnSe layers in the repeating unit. A change in the c-lattice parameter of 0.579(3) nm per SnSe bilayer was observed. The thickness of the NbSe2 layer was determined to be 1.281(4) nm: twice the value of a single NbSe2 layer. HAADF-STEM images revealed the presence of extensive rotational disorder and the lack of any epitaxial relationship among the constituent layers. Two different coordination environments for the Nb in NbSe2 (trigonal prismatic and octahedral) were observed. The electrical resistivity increases and the carrier concentration decreases in the ([SnSe]1+δ)m(NbSe2)2 compounds with increasing number of SnSe bilayers. The temperature dependence of the resistivity suggests localization of carriers for higher m values. The decline in carrier concentration as a function of m implies the presence of charge transfer from SnSe to NbSe2. The transport properties of the ([SnSe]1+δ)m(NbSe2)2 compounds and the previously reported ([SnSe]1+δ)m(NbSe2)1 compounds both have unusually temperature independent resistivity compared to bulk NbSe2. Compounds with similar m/n ratios exhibit similar transport properties. Consequently, the dominant effect on the transport properties of ([SnSe]1+δ)m(NbSe2)2 is charge transfer, and there are only subtle differences between a monolayer and a bilayer of NbSe2.

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Two-dimensional square-pyramidal VO₂ with tunable electronic properties

Abstract: In order to design the high-performance spintronics, it is rather critical to develop new materials, which can easily regulate the magnetism of nanostructures.

Cited by 22 publications

References 55 publications

Tunable band gap and magnetism of the two-dimensional nickel hydroxide

Tunable band gap and magnetism of the two-dimensional nickel hydroxide

Room-Temperature Ferromagnetism in Two-Dimensional Fe₂Si Nanosheet with Enhanced Spin-Polarization Ratio

Charge transfer vs. dimensionality: what affects the transport properties of ferecrystals?

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Two-dimensional square-pyramidal VO2 with tunable electronic properties

Abstract: In order to design the high-performance spintronics, it is rather critical to develop new materials, which can easily regulate the magnetism of nanostructures.

Cited by 22 publications

References 55 publications

Tunable band gap and magnetism of the two-dimensional nickel hydroxide

Tunable band gap and magnetism of the two-dimensional nickel hydroxide

Room-Temperature Ferromagnetism in Two-Dimensional Fe2Si Nanosheet with Enhanced Spin-Polarization Ratio

Charge transfer vs. dimensionality: what affects the transport properties of ferecrystals?

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Two-dimensional square-pyramidal VO₂ with tunable electronic properties

Room-Temperature Ferromagnetism in Two-Dimensional Fe₂Si Nanosheet with Enhanced Spin-Polarization Ratio