Synthesis of diluted magnetic semiconductor Bi2−xMnxTe3 nanocrystals in a host glass matrix

Silva, R.S.; Mikhail, H.; Pavani, Renato; Cano, Nilo F.; Silva, A.C.A.; Dantas, Noélio O.

doi:10.1016/j.jallcom.2015.07.045

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…Von Bardeleben et al [23] investigated Mndoped thin films of Bi 2 Se 3 in the ferromagnetic regime (T ≤ 6 K) by means of ferromagnetic resonance. Another paper [24] reported ESR studies on Bi 2−x Mn x Te 3 nanocrystals that are embedded in a glass matrix.…”

Section: Introductionmentioning

confidence: 99%

Spin dynamics and magnetic interactions of Mn dopants in the topological insulatorBi2Te3

et al. 2016

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The magnetic and electronic properties of the magnetically doped topological insulator Bi2−xMnxTe3 were studied using electron spin resonance (ESR) and measurements of static magnetization and electrical transport. The investigated high-quality single crystals of Bi2−xMnxTe3 show a ferromagnetic phase transition for x ≥ 0.04 at TC ≈ 12 K. The Hall measurements reveal a p-type finite charge-carrier density. Measurements of the temperature dependence of the ESR signal of Mn dopants for different orientations of the external magnetic field give evidence that the localized Mn moments interact with the mobile charge carriers leading to Ruderman-Kittel-KasuyaYoshida-type ferromagnetic coupling between the Mn spins of order 2 − 3 meV. Furthermore, ESR reveals a low-dimensional character of magnetic correlations that persist far above the ferromagnetic ordering temperature.

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Section: Introductionmentioning

confidence: 99%

Spin dynamics and magnetic interactions of Mn dopants in the topological insulatorBi2Te3

et al. 2016

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“…Therefore, the long-range magnetic properties generated by the domain of the Cr ion doping spins, in addition to the insulating topological states of the Bi 2 Te 3 semiconductor NCs, have aroused great interest in the scientific community for the development of spintronic nanodevices [24,25,27,28].…”

Section: Figure 6(d)mentioning

confidence: 99%

“…The synthesis of Bi 2 Te 3 NCs in diamagnetic host glasses allows the samples' high chemical stability. During fusion, Cr ions can incorporate into these systems allowing possible applications in the manufacture of magneto-optical devices [25][26][27]. Therefore, the long-range magnetic properties generated by the domain of the Cr ion doping spins, in addition to the insulating topological states of the Bi 2 Te 3 semiconductor NCs, have aroused great interest in the scientific community for the development of spintronic nanodevices [24,27,28].…”

Section: Introductionmentioning

confidence: 99%

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Doped Semiconductor Nanocrystals: Development and Applications

Silva¹,

Alvin²,

Santos³

et al. 2021

Nanocrystals [Working Title]

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This chapter aims to show significant progress that our group has been developing and the applications of several doped semiconductor nanocrystals (NCs), as nanopowders or embedded in glass systems. Depending on the type of dopant incorporated in the nanocrystals, the physical, chemical, and biological properties can be intensified. However, it can also generate undesired toxic effects that can potentially compromise its use. Here we present the potential of zinc oxide NCs doped with silver (Ag), gold (Au), and magnesium (Mg) ions to control bacterial diseases in agriculture. We have also performed biocompatibility analysis of the pure and Ag-doped sodium titanate (Na2Ti3O7) NCs in Drosophila. The doped nanocrystals embedded in glassy systems are chrome (Cr) or copper (Cu) in ZnTe and Bi2Te3 NCs for spintronic development nanodevices. Therefore, we will show several advantages that doped nanocrystals may present in the technological and biotechnological areas.

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“…The SNAB glass matrix was chosen because it presents good chemical stability, optical transparency in the visible and near-infrared spectra regions, and is nontoxic, which makes it an excellent template for the growth of different kinds of nanocrystals [8,30,31,32]. The structural and magnetic properties of Bi 2− x Fe x S 3 nanocrystals were investigated experimentally by the techniques of transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), atomic and magnetic force microscopy (AFM/MFM), and electron paramagnetic resonance (EPR).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of Fe-Doped Bi2S3 Semimagnetic Nanocrystals Embedded in a Glass Matrix

et al. 2017

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Iron-doped bismuth sulphide (Bi2−xFexS3) nanocrystals have been successfully synthesized in a glass matrix using the fusion method. Transmission electron microscopy images and energy dispersive spectroscopy data clearly show that nanocrystals are formed with an average diameter of 7–9 nm, depending on the thermic treatment time, and contain Fe in their chemical composition. Magnetic force microscopy measurements show magnetic phase contrast patterns, providing further evidence of Fe incorporation in the nanocrystal structure. The electron paramagnetic resonance spectra displayed Fe3+ typical characteristics, with spin of 5/2 in the 3d5 electronic state, thereby confirming the expected trivalent state of Fe ions in the Bi2S3 host structure. Results from the spin polarized density functional theory simulations, for the bulk Fe-doped Bi2S3 counterpart, corroborate the experimental fact that the volume of the unit cell decreases with Fe substitutionally doping at Bi1 and Bi2 sites. The Bader charge analysis indicated a pseudo valency charge of 1.322|e| on FeBi1 and 1.306|e| on FeBi2 ions, and a spin contribution for the magnetic moment of 5.0 µB per unit cell containing one Fe atom. Electronic band structures showed that the (indirect) band gap changes from 1.17 eV for Bi2S3 bulk to 0.71 eV (0.74 eV) for Bi2S3:FeBi1 (Bi2S3:FeBi2). These results are compatible with the 3d5 high-spin state of Fe3+, and are in agreement with the experimental results, within the density functional theory accuracy.

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Synthesis of diluted magnetic semiconductor Bi2−xMnxTe3 nanocrystals in a host glass matrix

Cited by 12 publications

References 28 publications

Spin dynamics and magnetic interactions of Mn dopants in the topological insulatorBi2Te3

Spin dynamics and magnetic interactions of Mn dopants in the topological insulatorBi2Te3

Doped Semiconductor Nanocrystals: Development and Applications

Synthesis and Study of Fe-Doped Bi2S3 Semimagnetic Nanocrystals Embedded in a Glass Matrix

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