Ferromagnetic Cr<sub>2</sub>Te<sub>3</sub> nanorods with ultrahigh coercivity

Wang, Fang; Du, Juan; Sun, Fan; Sabirianov, Renat; Al-Aqtash, Nabil; Sengupta, Debasis; Zeng, Hao; Xu, Xin

doi:10.1039/c8nr02272k

Cited by 48 publications

(32 citation statements)

References 35 publications

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“…This means that the Curie temperature (T c ) of Cr 2 Te 3 is approximately 180 K, in accord with our reported results. 28 Nevertheless, two obvious transitions appear in Figure 3b (x = ), where M is the magnetization, H is the magnetic field strength, and C is the Curie temperature constant of a material. There is a linear relationship between 1/χ and T for a specific material.…”

Section: Resultssupporting

confidence: 87%

“…163) space group (a = 6.82 Å, c = 12.08 Å) (Figure S1). 28 In this nonlayered Cr 2 Te 3 unit cell, there are three types of Cr atoms: one-quarter of the Cr atoms occupy the Cr I site, one-half occupy the Cr II site, and others occupy the Cr III site. In contrast, the CrGeTe 3 is a substantial 2D layered lattice with a large interlayer gap (d 0 = 6.9 Å), which has a similar hexagonal structure with an R3 (No.…”

Section: Resultsmentioning

confidence: 99%

“…First, a Cr 2 Te 3 binary template was synthesized by a modified organic-solvent-phase chemical decomposition method. 28 The source ratio of Cr:Te was 1:1.8. Second, the ternary CrGeTe 3 was prepared by injecting a Ge source into a binary Cr 2 Te 3 seed crystal using the cation exchange method.…”

Section: Methodsmentioning

confidence: 99%

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Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe₃ Nanosheets from a Non-vdW Cr₂Te₃Template

et al. 2020

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CrGeTe3 has recently emerged as a new class of two-dimensional (2D) materials due to its intrinsic long-range ferromagnetic order. However, almost all the reported synthesis methods for CrGeTe3 nanosheets are based on the conventional mechanical exfoliation from single-crystalline CrGeTe3, which is prepared by the complicated self-flux technique. Here we report a solution-processed synthesis of CrGeTe3 nanosheets from a non-van der Waals (vdW) Cr2Te3 template. This structure evolution from non-vdW to vdW is originated from the substitution of Ge atoms on the Cr sites surrounded by fewer Te atoms in the Cr2Te3 lattice due to their smaller steric hindrance and lower energy barrier. These CrGeTe3 nanosheets present regular hexagonal structures with a diameter larger than 1 μm and excellent stability. They exhibit soft magnetic behavior with a Curie temperature lower than 67.5 K. This non-vdW to vdW synthesis strategy promotes the development of CrGeTe3 in ferromagnetism while providing an effective route to synthesize other 2D materials.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

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Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe₃ Nanosheets from a Non-vdW Cr₂Te₃Template

et al. 2020

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“…Previously, we reported a giant coercivity of 4 Tesla and a transition temperature above 300 K in chemically synthesized Fe3Se4 nanostructures down to a few unit cell thickness [13]. Chemically synthesized Cr2Te3 nanostructures, thin films grown by molecular beam epitaxy, and 2D layers synthesized by chemical vapor deposition (CVD) have been reported recently [14,15,16,17]. However, 6 systematic theoretical and experimental studies on the magnetic behavior of atomically-thin Cr2Te3 are so far lacking.…”

Section: Introductionmentioning

confidence: 99%

Covalent 2D Cr₂Te₃ ferromagnet

Bian

Kamenskii

Han

et al. 2021

Materials Research Letters

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To broaden the scope of van der Waals 2D magnets, we report the synthesis and magnetism of covalent 2D magnetic Cr 2 Te 3 with a thickness down to one-unit-cell. The 2D Cr 2 Te 3 crystals exhibit robust ferromagnetism with a Curie temperature of 180 K, a large perpendicular anisotropy of 7 × 10 5 J m −3 , and a high coercivity of ∼ 4.6 kG at 20 K. First principles calculations further show a transition from canted to collinear ferromagnetism, a transition from perpendicular to in-plane anisotropy, and emergent half-metallic behavior in atomically-thin Cr 2 Te 3 , suggesting its potential application for injecting carriers with high spin polarization into spintronic devices. IMPACT STATEMENTA T C of 180 K, a perpendicular anisotropy of 7 × 10 5 J m −3 , and a high coercivity of ∼ 4.6 kG were achieved in covalent Cr 2 Te 3 2D ferromagnets.

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“…A systematic study of the structural and magnetic properties of Cr 2 Te 3 films on CdTe(001) substrates showed that the epitaxial relationship of the film with the substrate depends on the Cr:Te flux ratio during growth 7 . Cr 2 Te 3 has also been grown in the form of nanorods using a high-temperature organic-solution-phase method 8 .…”

Section: Introductionmentioning

confidence: 99%

Cr2Te3 Thin Films for Integration in Magnetic Topological Insulator Heterostructures

Burn

Duffy

Fujita

et al. 2019

Sci Rep

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Chromium telluride compounds are promising ferromagnets for proximity coupling to magnetic topological insulators (MTIs) of the Cr-doped (Bi,Sb) 2 (Se,Te) 3 class of materials as they share the same elements, thus simplifying thin film growth, as well as due to their compatible crystal structure. Recently, it has been demonstrated that high quality (001)-oriented Cr 2 Te 3 thin films with perpendicular magnetic anisotropy can be grown on c -plane sapphire substrate. Here, we present a magnetic and soft x-ray absorption spectroscopy study of the chemical and magnetic properties of Cr 2 Te 3 thin films. X-ray magnetic circular dichroism (XMCD) measured at the Cr L 2,3 edges gives information about the local electronic and magnetic structure of the Cr ions. We further demonstrate the overgrowth of Cr 2 Te 3 (001) thin films by high-quality Cr-doped Sb 2 Te 3 films. The magnetic properties of the layers have been characterized and our results provide a starting point for refining the physical models of the complex magnetic ordering in Cr 2 Te 3 thin films, and their integration into advanced MTI heterostructures for quantum device applications.

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Ferromagnetic Cr₂Te₃ nanorods with ultrahigh coercivity

Cited by 48 publications

References 35 publications

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe₃ Nanosheets from a Non-vdW Cr₂Te₃Template

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe₃ Nanosheets from a Non-vdW Cr₂Te₃Template

Covalent 2D Cr₂Te₃ ferromagnet

Cr2Te3 Thin Films for Integration in Magnetic Topological Insulator Heterostructures

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Ferromagnetic Cr2Te3 nanorods with ultrahigh coercivity

Cited by 48 publications

References 35 publications

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe3 Nanosheets from a Non-vdW Cr2Te3Template

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe3 Nanosheets from a Non-vdW Cr2Te3Template

Covalent 2D Cr2Te3 ferromagnet

Cr2Te3 Thin Films for Integration in Magnetic Topological Insulator Heterostructures

Contact Info

Product

Resources

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Ferromagnetic Cr₂Te₃ nanorods with ultrahigh coercivity

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe₃ Nanosheets from a Non-vdW Cr₂Te₃Template

Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe₃ Nanosheets from a Non-vdW Cr₂Te₃Template

Covalent 2D Cr₂Te₃ ferromagnet