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Dyson line and modified Dyson line in the EPR measurements

100%
Popovych V., Bester M., Stefaniuk I., Kuzma M.
Nukleonika
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2015
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vol. 60
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issue 3
385-388
EN
The difficulty in determining the electron paramagnetic resonance (EPR) line parameters of ferromagnetic semiconductors has been addressed. For these materials, the resonance line is very broad and lies at low resonance field, so that only a part of the line can be detected experimentally. Moreover, the line is of asymmetric (Dysonian) shape as described by the line shape parameter α. We have compared values of line parameters derived by computer fitting of the whole experimental EPR line to the Dyson function (or modified Dyson function) with the values obtained by applying this procedure to the left and the right half of the line.
2
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Magnetic transformation in Ni-Mn-In Heusler alloy

100%
Kuzma M., Maziarz W., Stefaniuk I.
Nukleonika
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2015
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vol. 60
|
issue 3
435-438
EN
Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335–100 K. In the temperature region of 265–170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation temperatures: Ms, Mf, As, Af. In the austenite crystal state, a weak antiferromagnetic interaction was observed, whereas ferromagnetism was detected in the low temperature martensitic state.
3
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Optical absorption and reflectivity spectra of highly chromium doped CdTe alloy and layer

88%
Potera P., Stefaniuk I., Kuzma M., Virt I., Pukowska B.
Open Physics
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2009
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vol. 7
|
issue 2
299-303
EN
In the present work, a CdTe alloy doped with a relatively high concentration of chromium (1%), and a CdTe:Cr layer, have been studied. Absorption and reflectivity spectra were measured at room temperature. They indicate the presence of chromium in the divalent state, both in the alloy and in the layer.
4
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Structural and optical properties of layers of pentacene formed by PLD method

76%
Potera P., Sagan P., Virt I., Kuzma M., Wisz G., Rudyj I., Frugynski M.
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vol. 6
|
issue 4
765-770
EN
Organic films fabrication offers the possibility of producing electronic devices of low weight, mechanical flexibility and low cost. One suitable material for organic film fabrigation which is the subject of the great interest is pentacene, because it is characterized by the large carrier mobility (∼1 cm2/Vs). In this work, the growth of pentacene layers using pulse laser deposition (PLD) on different substrates (glass/ITO, Si) is described and various processing parameters are investigated. Two pulsed YAG:Nd3+ laser wavelengths were used for the ablation of the PLD target: the first harmonic at 1064 nm aGn:dNdth3+e second at 532 nm. The structure of the layers formed was examined using SEM and RHEED methods. The results were compared with results of optical spectroscopy studies. It will be shown that layers deposed using second harmonics have a higher quality than those for first harmonic. The other PLD parametersalso have a strong influence on the structure quality of layers.
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