Technological aspects of fabrication of semimagnetic semiconductor nanocrystals

Савчук, A. Й.; Stolyarchuk, I.D.; Medynskiy, S.V; Fediv, V. I.; Kandyba, Ye.O.; Perrone, A.; DeGiorgi, M.; Никитин, П. И.

doi:10.1016/s0928-4931(01)00241-7

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…In the micrograph (see example in our previous paper [8]) the Cd 1-x Mn x Te quantum dots appeared as dark spots on light background of transparent matrix SiO 2 . The distribution of the radii of spherical dots was well approximated by a Gaussian function and the best result concerning narrow size dispersion was achieved for chemically synthesized nanocrystals.…”

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confidence: 75%

Magneto‐optical Faraday effect in II–VI based semimagnetic semiconductor nanocrystals

Савчук

Fediv

Stolyarchuk

et al. 2006

Phys. Status Solidi (c)

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Different physical and chemical methods were used to prepare II-VI based semimagnetic semiconductor nanocrystals. A study of magneto-optical Faraday effect in the nanocrystals revealed its enhancement as compared with bulk crystals. It is explained in framework of increase in the oscillator strength of exciton transitions and to the difference between these strengths in an external magnetic field. It was observed almost linear dependence of the Faraday rotation as function of magnetic field strength for nanocrystals at liquid helium temperature in contrast to the dependence with saturation in bulk case and changes in process of a transition of the semimagnetic nanocrystals from the paramagnetic state to a spin glass state. One of them is the study of semimagnetic semiconductor quantum dots in the form of nanoparticles or nanocrystals embedded in dielectric matrix. The main feature of the bulk semimagnetic semiconductors type of II 1-x Mn x VI is the strong s,p-d spin exchange interaction between the band carriers and the magnetic ions which results in a large Zeeman splitting of the valence and conduction band states, a giant Faraday rotation and the formation of magnetic polarons. It is obvious that when one goes from bulk material to zero-dimensional structures the mentioned magneto-optical phenomena should be modified by strong confinement in all three dimensions. From the point of view of applications it should be noted [1] that the spin states of carrier confined in such zero-dimensional structures could serve as a Q-bit for quantum information processing. The other practical approach [2] is the application of semiconductor nanocrystals doped with a paramagnetic ions as connector material between ferromagnetic metal and semiconductor which could significantly increase spin injection in spintronic devices. These new aspects clearly demonstrate that semimagnetic semiconductor quantum dots open up many possibilities in spin electronics by providing a versitale system for controlling electron spins with many tunable parameters. In this report we present results of magneto-optical studies of II-VI based semimagnetic semiconductor nanocrystals prepared by different physical and chemical techniques.

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confidence: 75%

Magneto‐optical Faraday effect in II–VI based semimagnetic semiconductor nanocrystals

Савчук

Fediv

Stolyarchuk

et al. 2006

Phys. Status Solidi (c)

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“…The synthesis of CdS:Mn nanoparticles was realized in the multicomponent system CdCl 2 -MnCl 2 -Na 2 S-H 2 Osurfactant (or polymer) at room temperature [8][9][10]. The concentrations of salt solutions of CdCl 2 , MnCl 2 , Na 2 S and the pH value were selected with regard to theoretical considerations.…”

Section: Methodsmentioning

confidence: 99%

Optical and magneto-optical diagnostics of polymer/nanoparticles colloidal solutions and composites

et al. 2009

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In this work we report on peculiarities of technique for correct measurements of optical transmittance, optical density and Faraday rotation spectra of colloidal semiconductor nanoparticles and nanocomposites. As an example we have used CdS:Mn nanoparticles embedded in polyvinylalcohol (PVA) matrix. With the decrease of the size of CdS:Mn nanoparticles, the absorption exciton band was shifted to shorter wavelengths as a result of quantum confinement effect. In order to observe clearly this shift we have used several samples with the same average nanoparticle size, but with different sample thicknesses. It was made analysis of the obtained data on optical spectra for nanocomposites with comparison for bulk semiconductor materials. Similar methodology was applied for magneto-optical spectra of colloidal solutions and nanocomposites.

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“…Процес напилення здійснювався таким чином, що лазерний промінь почергово скеровувався то на одну, то на другу половину мішені. В другому випадку використовувалась складна композиційна мішень і здійснювалось одночасне випаровування напівпровідникового та діелектричного матеріалів [10].…”

Section: експериментальна частинаunclassified

Magneto-Optical Properties of CdMnTe Diluted Magnetic Semiconductor Nanoparticles Prepared by Physical Methods

Stolyarchuk

2015

PCSS

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Technological aspects of fabrication of semimagnetic semiconductor nanocrystals

Cited by 9 publications

References 7 publications

Magneto‐optical Faraday effect in II–VI based semimagnetic semiconductor nanocrystals

Magneto‐optical Faraday effect in II–VI based semimagnetic semiconductor nanocrystals

Optical and magneto-optical diagnostics of polymer/nanoparticles colloidal solutions and composites

Magneto-Optical Properties of CdMnTe Diluted Magnetic Semiconductor Nanoparticles Prepared by Physical Methods

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