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Optical Pump - Terahertz Probe Measurement of the Electron Dynamics in Ga_{1-x}Mn_xAs

100%

Šustavičiūtė R., Balakauskas S., Adomavičius R., Krotkus A., Sadowski J.

Acta Physica Polonica A

2007

vol. 112

issue 2

311-314

An optical pump - terahertz probe technique was used for measuring electron lifetime in various Ga_{1-x}Mn_xAs epitaxial layers with the subpicosecond temporal resolution. The measurements were performed on the samples with x up to 2%, which had large resistivities and were transparent in a THz frequency range. It has been found that an induced THz absorption relaxation is the fastest and electron lifetimes are the shortest for the samples with the smallest Mn content. For the samples with x=0.3% and x=2% this relaxation becomes much slower; its rate is comparable to the carrier recombination rate in Ga_{1-x}Mn_xAs substrate.

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

73%

Šimkiene I., Baran M., Babonas G., Bendorius R., Rėza A., Szymczak R., Aleshkevych P., Šustavičiūtė R., Tamaševičius R.

Acta Physica Polonica A

2005

vol. 107

issue 2

400-407

Iron-containing nanoparticles and clusters were formed in silica with porosity, which was predetermined by different procedures of sol-gel technology and the chemical composition of precursors. Bulk and layer-type samples of different porosity were synthesized and investigated. The morphology, magnetic, and optical properties were studied to characterize the samples and to analyze the formation of Fe-oxides. Experimental results showed that both Fe_2O_3 and Fe_3O_4 were formed in the samples and that their relative amount was dependent on preparation technology.

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2 Acta Physica Polonica A

1 2007

1 2005

2 Šustavičiūtė R.

1 Adomavičius R.

1 Aleshkevych P.

1 Babonas G.

1 Balakauskas S.

1 Baran M.

1 Bendorius R.

1 Krotkus A.

1 Rėza A.

1 Sadowski J.

1 Szymczak R.

1 Tamaševičius R.

1 Šimkiene I.

Search results

Optical Pump - Terahertz Probe Measurement of the Electron Dynamics in Ga_{1-x}Mn_xAs

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity