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Portable Raman spectrometer - design rules and applications

100%
Gnyba M., Wierzba P., Smulko J., Kwiatkowski A.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2011
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issue 3
2
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Detection of illicit chemicals by portable Raman spectrometer

100%
Smulko J., Kwiatkowski A., Gnyba M.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2011
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issue 4
3
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MnAs Nanocrystals Embedded in GaAs

76%
Kwiatkowski A., Wasik D., Kamińska M., Twardowski A., Dłużewski P., Borysiuk J., Sadowski J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 5
1207-1211
EN
Magnetic properties of MnAs nanocrystals embedded in GaAs are analyzed in the frame of phenomenological model proposed by Sasaki for ferritin superparamagnets. Our calculations explain qualitatively experimental data of magnetization versus temperature, obtained according to zero-field-cooled and field-cooled protocols. They show dynamics of magnetization of MnAs nanocrystals in range of temperature from 10 K to 320 K. There is transition from state in which very slow dynamics is observed (frozen state) to state in which dynamics is fast (quasi-superparamagnetic state).
4
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76%
Kwiatkowski A., Borysiuk J., Bożek R., Wasik D., Kamińska M., Sadowski J., Twardowski A.
Acta Physica Polonica A
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2006
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vol. 110
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issue 2
233-236
EN
We report on cross-sectional transmission electron microscopy and magnetic force microscopy studies performed on self-organized MnAs nanoclusters embedded in GaAs. It was found that 10÷20 nm large MnAs ferromagnetic nanocrystals were formed during rapid thermal annealing of Ga_{1-x}Mn_xAs layers at 600ºC, leading to magnetic contrasts in magnetic force microscopy images.
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