Search results

1

Influence of Local Potential on Exciton Splitting in Highly Diluted Cd_{1-x}Mn_{x}Te

100%

Kłopotowski L., Herbich M., Mac W., Stachow-Wójcik A., Twardowski A.

Acta Physica Polonica A

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1997

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vol. 92

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issue 4

837-840

EN

We investigated magnetoreflectance and magnetization of highly diluted bulk Cd_{1-x}Mn_{x}Te crystals 0.2% ≤ x ≤ 10%. The exchange constant in terms of mean field approximation and virtual crystal approximation (the ratio of the heavy hole exciton splitting to mean spin per unit cell) was evaluated and found x-dependent. This deviation from the mean field approximation and virtual crystal approximation prediction is caused by the local potential introduced by Mn ions. We discuss the problem within a Wigner-Seitz approach and within a model of magnetic and chemical disorder based on the alloy theory.

2

Magnetic Properties of EuS/PbS Semiconducting Structures

86%

Stachow-Wójcik A., Twardowski A., Story T., Dobrowolski W., Grodzicka E., Sipatow A.

Acta Physica Polonica A

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1997

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vol. 92

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issue 5

985-988

EN

We report results of magnetization study of EuS/PbS superstructures with different thicknesses of magnetic and nonmagnetic layers. Reduction of ferromagnetic phase transition temperature was found with decreasing EuS thickness. Reasonable description of this effect is obtained within the model based on the mean field approximation.

3

Magnetic Anisotropy in Eus-pbs Multilayers

73%

Story T., Swüste C., Swagten H., de Jonge W., Stachow-Wójcik A., Twardowski A., Arciszewska M., Dobrowolski W., Gałązka R., Sipatov A.

Acta Physica Polonica A

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2000

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vol. 97

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issue 3

435-438

EN

We present the results of ferromagnetic resonance studies of the thickness dependence of magnetic anisotropy in 2 series of EuS-PbS multilayers grown on (111) BaF_{2} and (100) KCl substrates with the EuS thickness varying in the range d=6-70 Å. The anisotropy constant K was found to follow the dependence K(d)=K_{V}+2K_{S}/d , with the surface term K_{S} larger for layers grown on BaF_{2} as compared to KCl. This difference is discussed in terms of different thermal stress-induced distortions of cubic crystal lattice of EuS. We found that the thickness of EuS layer required for the perpendicular (to the layer) magnetization is d ≤ 2-3 Å, i.e., it is below 1 monolayer.

4

A Photoluminescence Study in PbS-EuS Superlattices

73%

Kowalczyk L., Sadowski J., Gałązka R., Stachow-Wójcik A., Sipatov A., Volobuev V., Smirnov V., Dugaev V.

Acta Physica Polonica A

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1998

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vol. 94

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issue 3

397-400

EN

Investigations of the photoluminescence of PbS-EuS superlattices deposited on (111)BaF_{2} substrates are presented. Quantum-size and deformation effects in photoluminescence spectra are observed. The strain-induced gap shift and valence-band offset is determined from experimental results. A strong stimulated photoluminescence with relatively low threshold was observed. It was found that the photocarriers generated in EuS barrier strongly affect the population of PbS subbands.

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4 Acta Physica Polonica A

1 2000

1 1998

2 1997

4 Stachow-Wójcik A.

3 Twardowski A.

2 Dobrowolski W.

2 Gałązka R.

2 Sipatov A.

2 Story T.

1 Arciszewska M.

1 Dugaev V.

1 Grodzicka E.

1 Herbich M.

1 Kowalczyk L.

1 Kłopotowski L.

1 Mac W.

1 Sadowski J.

1 Sipatow A.

1 Smirnov V.

1 Swagten H.

1 Swüste C.

1 Volobuev V.

1 de Jonge W.

Influence of Local Potential on Exciton Splitting in Highly Diluted Cd_{1-x}Mn_{x}Te

Magnetic Properties of EuS/PbS Semiconducting Structures

Magnetic Anisotropy in Eus-pbs Multilayers

A Photoluminescence Study in PbS-EuS Superlattices