Ferromagnetism and the Optical Properties of Mn-Doped CdSe with the Wurtzite Structure

Tian, Jun-Hong; Sun, Xiaowei; Song, Ting; Ouyang, Yu-Hua; Wang, Ting; Jiang, Gang

doi:10.1007/s10948-017-4109-2

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Comparing the zinc-blend and wurtzite structures of MnSe, the Raman line at 256.2 cm −1 and 303.8 cm −1 may be due to the presence of Mn 2+ and Mn 3+ -like states, though Mn 3+ state is energetically unfavorable [20,21]. Interestingly, the presence of NrGO layers, Mn 3+ like-and defect like-states are disappearing in our sample.…”

Section: Resultsmentioning

confidence: 61%

Enhanced exciton binding energy, Zeeman splitting and spin polarization in hybrid layered nanosheets comprised of (Cd, Mn)Se and nitrogen-doped graphene oxide: implication for semiconductor devices

Halder¹,

Mallik²,

Suffczyński³

et al. 2021

Nanotechnology

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The exciton properties of (Cd,Mn)Se-NrGO (nitrogen doped reduced graphene oxide) hybrid layered nanosheets have been studied in a magnetic field up to 10 T and compared to those of (Cd,Mn)Se nanosheets. The temperature dependent photoluminescence reveals the hybridization of inter-band exciton and intra-center Mn transition with enhancement of the binding energy of exciton-Mn hybridized state (80 meV with respect to 60 meV in (Cd,Mn)Se nanosheets) and increase of exciton—phonon coupling strength to 90 meV (with respect to 55 meV in (Cd,Mn)Se nanosheets). The circularly polarized magneto—photoluminescence at 2 K provides evidence for magnetic field induced exciton spin polarization and the realization of excitonic giant Zeeman splitting with g eff as high as 165.4 ± 10.3, much larger than in the case of (Cd,Mn)Se nanosheets (63.9 ± 6.6), promising for implementation in spin active semiconductor devices.

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Section: Resultsmentioning

confidence: 61%

Enhanced exciton binding energy, Zeeman splitting and spin polarization in hybrid layered nanosheets comprised of (Cd, Mn)Se and nitrogen-doped graphene oxide: implication for semiconductor devices

Halder¹,

Mallik²,

Suffczyński³

et al. 2021

Nanotechnology

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“…[14] It is worth noting that earlier DFT calculations demonstrated that Fedoping II-VI DMSQDs elicits a half-metallic bandgap that further supports the presence of RT-FM. [15] A cornerstone paper [16] on the stoichiometric cationic clusters (CdSe) n , (CdTe) n , (ZnS) n , and (ZnSe) n performed by using mass spectrometry and density-functional-theory (DFT) methods demonstrated that the most abundant "magic-sized" clusters appear at n = 13, 33, and 34. Subsequently, it was found that a magic (CdSe) 34 cluster is an important intermediate in the nucleation of nanocrystals whereas another magic (CdSe) 13 cluster can serve as a nucleant for nanobelts.…”

Section: Introductionmentioning

confidence: 99%

Joint Studies of Spin Frustration Induced by Doping Small ZnSe Nanoparticles with Fe Atoms

Gutsev

Bindra

Strouse

et al. 2022

Advanced Physics Research

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As a 1.8 nm ZnSe nanocrystal is progressively doped with 1%, 5%, and 10% Fe, it shows a progressive change in its magnetic properties from a superparamagnetic FM‐dominated exchange type to an onset of AFM exchange with evidence of spin frustration. Magnetization measurements allow to obtain exchange coupling constants that are compared to the results of a Broken‐Symmetry Density Functional Theory (BS‐DFT) model of a doped (ZnSe)34 cluster. DFT shows a capability to reproduce the experimental pattern of the increasing influence of AFM exchange as doping concentration increases. The material phase segregates at the edges where strained rhombic surface sites are the preferred doping sites of iron. Large concentrations of iron leads to the formation of Fe clusters and complex exchange patterns that result in spin frustration in some iron trimers but none in the others. The spin frustration of these complex systems by assuming mirror symmetry of the sites when fitting by using BS‐DFT formalism is classified and analyzed. While some individual J constants obtained have significant errors, the averaged exchange constants are generally in good agreement with our experimental data.

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“…As reported in recent literature, magnetism can be induced via chemical doping of transition metal ions in minute quantities in otherwise diamagnetic CdSe [6][7][8][9][10]. However, the key challenges while doping CdSe with transition metal ions is to control their concentration, distribution, and oxidation state since all these parameters affect the structural, optical, magnetic, and electronic properties of the diluted magnetic semiconductors so formed.…”

Section: Introductionmentioning

confidence: 99%

Inducing ferromagnetism in surface stabilised intrinsic CdSe nanoparticles by a simple process

Pokhriyal

Biswas

2020

Materials Science and Technology

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In this letter, we report a simple process to derive in situ surface stabilised intrinsic CdSe nanoparticles (NPs) showing room temperature ferromagnetism (RTFM). The observed RTFM is primarily attributed to the lattice strain ( ε) in the NPs supported by an effective core (CdSe)-shell (surface layer) charge transfer mechanism. The synthesis method allows precise control over particle morphology and dispersity, and is highly convenient in tuning the magnetic properties for pertinent applications. Highlights Magnetic CdSe nanoparticles were synthesized by a facile process. In situ formed graphitic-carbon layer on the surface stabilises the nanoparticles. The process permits precise control over particle morphology and dispersity. The technique is also convenient in tuning the magnetic properties. Monodispersed magnetic CdSe nanoparticles have potential applications in modern optoelectronics. GRAPHICAL ABSTRACT

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Ferromagnetism and the Optical Properties of Mn-Doped CdSe with the Wurtzite Structure

Cited by 7 publications

References 38 publications

Enhanced exciton binding energy, Zeeman splitting and spin polarization in hybrid layered nanosheets comprised of (Cd, Mn)Se and nitrogen-doped graphene oxide: implication for semiconductor devices

Enhanced exciton binding energy, Zeeman splitting and spin polarization in hybrid layered nanosheets comprised of (Cd, Mn)Se and nitrogen-doped graphene oxide: implication for semiconductor devices

Joint Studies of Spin Frustration Induced by Doping Small ZnSe Nanoparticles with Fe Atoms

Inducing ferromagnetism in surface stabilised intrinsic CdSe nanoparticles by a simple process

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