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Exchange Coupled Double Layers for Magneto-Optical Applications

100%

Becker S. , Rohrmann H. , Roell K. , Stobiecki F.

Acta Physica Polonica A

1997

tom 91

nr 1

55-65

Optical data storage is a rapidly developing technique, which emerges in many varieties. Magneto-optical recording, in particular, applies amorphous rare earth/transition metal films, where a binary coded information is written thermomagnetically and is read by the magneto-optical Kerr or Faraday effect. To increase the writing speed and the recording density, techniques for direct overwrite and magnetically induced superresolution were proposed, which involve these of exchange coupled double layer systems as a storage media. In this paper, the principles and the properties of exchange coupled double layers are discussed with respect to the direct overwrite and the magnetically induced superresolution processes. A formalism based on a switching field diagram is developed yielding all information necessary to achieve reliable and practical writing procedures. As an example, the direct overwrite capability is demonstrated experimentally in antiparallel coupled layer systems.

Surface Chemistry of Zirconia Nanopowders Doped with Pr_2O_3: an XPS Study

75%

Suchorski Y. , Wrobel R. , Becker S. , Opalińska A. , Narkiewicz U. , Podsiadly M. , Weiss H.

Acta Physica Polonica A

2008

tom 114

nr S

S-125-S-134

Zirconia nanopowders of tetragonal crystallographic structure doped with Pr_2O_3 were prepared by the microwave-assisted hydrothermal synthesis and coprecipitation method. The surface compositions were studied by X-ray photoelectron spectroscopy. The nanopowder particles appear to be inhomogeneous in their structure: for the surface region an enrichment with praseodymium is detected by X-ray photoelectron spectroscopy measurements. This allows the assumption of a core-shell-like structure of single nanopowders particles. The X-ray photoelectron spectroscopy studies confirm also Zr^{4+} and Pr^{3+} as main oxidation states of zirconium and praseodymium in the studied compounds.

Synthesis and characterization of Pt/CeOxsystems for catalytic CO oxidation reaction

75%

Wróbel R. , łagonda S. , Narkiewicz U. , Pełech R. , Becker S. , Szymaszkiewicz L.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

2011

tom 66

37-46

Four different ceria supported catalyst were prepared by impregnation method with Pt(NO3)2 solution. The two supports are commercially available (MaTeck) and the other two were prepared by precipitation and microwave assisted hydrothermal method (MAH) respectively. The phase composition and average crystallite size of the catalysts were characterised with XRD technique. Finally the catalytic activity in CO oxidation reaction were determined in plug flow reactor in temperature range 300-900 K with 1 K resolution. The catalysts obtained in both precipitation and MAH methods exhibit catalytic activity at room temperature whereas catalysts obtained on MaTeck supports are not active at those conditions. In turn, catalysts based on MaTeck support are more active in temperature range 420-700 K. The different activities are attributed to difference in average crystallite sizes and in support morphology.