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Diffraction Studies of Nanocrystals: Theory and Experiment

100%

Palosz B., Grzanka E., Gierlotka S., Stel'makh S., Pielaszek R., Bismayer U., Neuefeind J., Weber H., Palosz W.

Acta Physica Polonica A

2002

vol. 102

issue 1

57-82

Based on theoretical calculations of powder diffraction data it is shown that the assumption of the infinite crystal lattice for small particles is not justified, leads to significant changes of the diffraction patterns, and may lead to erroneous interpretation of the experimental results. An alternate evaluation of diffraction data of nanoparticles, based on the so-called "apparent lattice parameter", alp, is proposed.

Vertical Electron Transport through PbS-EuS Structures

81%

Wrotek S., Dybko K., Morawski A., Mąkosa A., Wosiński T., Figielski T., Tkaczyk Z., Łusakowska E., Story T., Sipatov A., Szczerbakow A., Grasza K., Wróbel J., Palosz W.

Acta Physica Polonica A

2003

vol. 103

issue 6

629-635

Temperature dependence of current-voltage I-V characteristics and resistivity is studied in ferromagnetic PbS-EuS semiconductor tunnel structures grown on n-PbS (100) substrates. For the structures with a single (2-4 nm thick) ferromagnetic EuS electron barrier we observe strongly non-linear I-V characteristics with an effective tunneling barrier height of 0.3-0.7 eV. The experimentally observed non-monotonic temperature dependence of the (normal to the plane of the structure) electrical resistance of these structures is discussed in terms of the electron tunneling mechanism taking into account the temperature dependent shift of the band offsets at the EuS-PbS heterointerface as well as the exchange splitting of the electronic states at the bottom of the conduction band of EuS.

Magnetic and Structural Properties of EuS-PbS Multilayers Grown on n-PbS (100) Substrates

81%

Chernyshova M., Łusakowska E., Domukhovski V., Grasza K., Szczerbakow A., Wrotek S., Kowalczyk L., Story T., Smits C., Swagten H., De Jonge W., Palosz W., Sipatov A., Volobuev V.

issue 4-5

609-615

Magnetic properties of semiconductor EuS(t)-PbS(d)-EuS(t) ferromagnetic trilayers (t=30÷300Å and d=7.5÷70Å) grown on n-type monocrystalline PbS (100) substrate were studied by SQUID magnetometry and ferromagnetic resonance technique yielding, in particular, the dependence of the ferromagnetic Curie temperature on the thickness of the EuS layer. Structural parameters of layers were examined by X-ray powder diffraction analysis. A high structural quality of the substrate and the multilayer was verified by the measurements of the X-ray rocking curve width indicating the values of the order of 100 arcsec and by atomic force microscopy revealing the presence on the cleft PbS surface regions practically flat in the atomic scale over the area of 1×0.1μm^2.

Refine search results

3 Acta Physica Polonica A

1 2003

2 2002

3 Palosz W.

2 Grasza K.

2 Sipatov A.

2 Story T.

2 Szczerbakow A.

2 Wrotek S.

2 Łusakowska E.

1 Bismayer U.

1 Chernyshova M.

1 De Jonge W.

1 Domukhovski V.

1 Dybko K.

1 Figielski T.

1 Gierlotka S.

1 Grzanka E.

1 Kowalczyk L.

1 Morawski A.

1 Mąkosa A.

1 Neuefeind J.

1 Palosz B.

1 Pielaszek R.

1 Smits C.

1 Stel'makh S.

1 Swagten H.

1 Tkaczyk Z.

1 Volobuev V.

1 Weber H.

1 Wosiński T.

1 Wróbel J.

Search results

Diffraction Studies of Nanocrystals: Theory and Experiment

Vertical Electron Transport through PbS-EuS Structures

Magnetic and Structural Properties of EuS-PbS Multilayers Grown on n-PbS (100) Substrates