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1

Magnetic Flux Density and Radial Distribution of Currents in HTSC Samples of Specific Shape Determined by Genetic Algorithm

100%

Piotrowski K., Gutowska M. U., Gutowski M.

Acta Physica Polonica A

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1997

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vol. 92

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issue 1

259-262

EN

Flux distribution in a Bi_{2}Sr_{2}CaCu_{2}O_{8} superconductor sample, shaped as a thin disk with a hole in the center, and covered with a thin layer of magnetic garnet, was observed by means of magneto-optical Faraday effect. Applying external magnetic field perpendicularly to the sample plane with zero field cooling history, we were able to observe the flux trapped in superconductor, visible as concentric rings. Both directions of the trapped field were observed near the sample surface. Using the genetic algorithm we were able to determine the radial distribution of concentric currents in the sample under study.

2

Assessment of Microstructure and Mechanical Properties of the Slag Ladle after Exploitation

89%

Kalandyk B., Zapała R., Sobula S., Tęcza G., Piotrowski K., Kalandyk B., Zapała R., Sobula S., Tęcza G., Piotrowski K.

Archives of Metallurgy and Materials

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2021

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vol. 66

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issue 2

3

Preisach Maps of Multilayered Co/Cu Structures

88%

Gutowski M., Gutowska M., Piotrowski K., Baczewski L., Wawro A.

Acta Physica Polonica A

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2000

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vol. 97

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issue 3

467-470

EN

Magnetooptical Kerr effect measurements of room temperature hysteresis loops were taken using sandwich- and multilayer-type specimens and He-Ne laser light. For maximal external field of ~250 Gs the corresponding Kerr angle reached 0.04 deg. The samples were obtained in the Institute of Physics, Polish Academy of Sciences, Warszawa, using MBE method. The structure of samples may be described by a formula: substrate-buffer layer-(xCo/yCu)_{n} -cover layer. Al_{2}O_{3} (two orientations) and MgO were used as substrates, the buffer layer was made of W, Cu or Fe, x=15, 20 or 25 Å, y=7, 8, 9, 10, 11, 12, 13, 14, and 20 Å, n=25 and 30. 50 Å of gold (Au) served as a cover layer. The genetic algorithm was subsequently used as a data processing tool, in order to reconstruct the Preisach map for each hysteresis loop. The diagrams clearly indicate changes of magnetic interactions caused by varying thicknesses of individual magnetic and non-magnetic layers.

4

Structural, Magnetic and Transport Properties οf NdBaCo_{2}O_{5+x} Thin Films Deposited by Magnetron Sputtering

64%

Vlakhov E., Szymczak R., Baran M., Piotrowski K., Szewczyk A., Paszkowicz W., Lobanovskii L., Matyajasik S., Nenkov K., Szymczak H.

Acta Physica Polonica A

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2009

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vol. 115

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issue 1

89-91

EN

For the first time, thin films of NdBaCo_{2}O_{5+x} were deposited by RF magnetron sputtering on different substrates. The films deposited on SrLaAlO_4(001) substrates exhibited highly textured structure with c-axis directed out-of-plane. Magnetic measurements M vs. T of three NdBaCo_{2}O_{5+x}/SrLaAlO_4(001) films revealed successively paramagnetic-ferromagnetic-antiferromagnetic transitions with decrease in temperature. Their paramagnetic Curie-Weiss temperatures were estimated to be in the range of T_{C}=100-116 K. Resistivity of the cobaltite thin film exhibited insulating behavior and the best fit was found for the variable range hopping mechanism.

5

Innovation technology for the production of massive slag ladles at the Krakodlew S.A. Foundry. Presentation of design works on research and development

63%

Paszkiewicz M., Guzik E., Kopyciński D., Kalandyk B., Burbelko A., Gurgul D., Sobula S., Ziółko A., Piotrowski K., Bednarczyk P., Paszkiewicz M., Guzik E., Kopyciński D., Kalandyk B., Burbelko A., Gurgul D., Sobula S., Ziółko A., Piotrowski K., Bednarczyk P.

Archives of Foundry Engineering

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2020

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vol. 20

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issue 4

Refine search results

Magnetic Flux Density and Radial Distribution of Currents in HTSC Samples of Specific Shape Determined by Genetic Algorithm

Assessment of Microstructure and Mechanical Properties of the Slag Ladle after Exploitation

Preisach Maps of Multilayered Co/Cu Structures

Structural, Magnetic and Transport Properties οf NdBaCo_{2}O_{5+x} Thin Films Deposited by Magnetron Sputtering

Innovation technology for the production of massive slag ladles at the Krakodlew S.A. Foundry. Presentation of design works on research and development