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Magnetic Centres in Functionalized Graphene

100%
Majchrzycki Ł., Augustyniak-Jabłokow M., Strzelczyk R., Maćkowiak M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
540-542
EN
Discussion of the origin of paramagnetic centres observed by electron paramagnetic resonance in graphene oxide (GO) and reduced graphene oxide (rGO) is done on the assumption that GO can be considered as a functionalized graphene. This leads to the conclusion that the narrow signal with g close to 2, observed for GO and thermally reduced GO, is due to paramagnetic centres localized on defects and exchange coupled to conduction electrons. Randomness of graphene modification results in variety of parameters of EPR signals. The broad signals observed in GO and rGO and ascribed to magnetic clusters on the zig-zag edge states indicate that the edge magnetism can be preserved by functionalization.
2
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Interlayer Exchange Coupling in Nb/Fe Multilayers

88%
Marczyńska A., Pugaczowa-Michalska M., Szymański B., Majchrzycki Ł., Smardz L.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
605-608
EN
The (110) oriented Nb-Fe multilayers (MLs) with constant Fe and variable Nb sublayer thicknesses were prepared at room temperature using UHV magnetron sputtering. The artificial periodicity was revealed by intense satellite peaks in the low- and high-angle X-ray diffraction patterns. Magnetic hysteresis loop measurements at 5 K revealed antiferromagnetic (AF) exchange coupling of the Fe sublayers for Nb spacer thickness of about 3 monolayers. The corresponding AF coupling energy is equal to about -1.36 mJ/m². The Nb spacer thickness corresponding to the position of the AF peak is in good agreement with ab-initio calculations within localized spin density approximations of exchange-correlation potential.
3
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Modification of Exchange Coupling in Fe/Nb/Fe/Pd Layered Structures using Hydrogen

76%
Wachowiak M., Marczyńska A., Dawczak-Dębicki H., Pugaczowa-Michalska M., Pacanowski S., Majchrzycki Ł., Smardz L.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
609-612
EN
Fe/Nb/Fe trilayers were prepared at room temperature using UHV magnetron sputtering. The interlayer exchange coupling energy was determined from a shift of the minor hysteresis loop from the origin. Results showed clear antiferromagnetic (AF) coupling maxima near ım6 and 9 monolayers of Nb spacer. Calculations of the interlayer exchange coupling energy were carried out using ab-initio method with localized spin density approximations of exchange-correlation potential. The experimental results were in good agreement with ab-initio calculations. Furthermore, the position of the AF peaks and coupling energy values could be modified using hydrogen.
4
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XPS and UPS Valence Band Studies of Nanocrystalline Ni-Ti Alloy Thin Films

64%
Pacanowski S., Skoryna J., Szajek A., Marczyńska A., Dawczak-Dębicki H., Werwiński M., Majchrzycki Ł., Smardz L.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
613-616
EN
In this contribution we study valence bands of in-situ prepared nanocrystalline NiTi and Ni₃Ti alloy thin films using X-ray and ultraviolet photoelectron spectroscopy. Additionally, theoretical valence band of NiTi alloy was calculated by ab-initio methods. The structure and morphology of the samples were studied by X-ray diffraction and atomic force microscopy, respectively. Furthermore, hydrogen absorption and desorption kinetics at a pressure of about 1000 mbar were studied in Pd covered nanocrystalline NiTi alloy thin film using four-point resistivity measurements. Results showed that modifications of the valence bands of the Ni-Ti thin films due nanocrystalline structure can influence on the room temperature hydrogen absorption and desorption kinetics.
5
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Preparation and Characterisation of Fe/Ce Multilayer

64%
Dawczak-Dębicki H., Marczyńska A., Pacanowski S., Szymański B., Majchrzycki Ł., Kowalski W., Grembowski W., Bilski T., Smardz L.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
628-631
EN
Ce/Fe multilayer (ML) with constant Fe (2 nm) and Ce (4.5 nm) sublayer thicknesses was prepared onto naturally oxidised Si(100) substrate using magnetron sputtering. Chemical purity of the sublayers was revealed in-situ by X-ray photoelectron spectroscopy (XPS) measurements. The structure of the sample was studied by standard low- and high-angle X-ray diffraction (XRD). Surface morphology of the ML was examined by atomic force microscopy. Magnetic properties of the sample was studied in the temperature range between 5 and 350 K using a vibrating sample magnetometer in a magnetic field up to 9 T. The hysteresis loops were measured in field perpendicular and parallel to the substrate. Furthermore, hydrogen absorption at a pressure of about 1000 mbar was studied at room temperature (RT) in Pd covered ML using four-point resistivity measurements. The solid state amorphisation reaction have been confirmed by XRD and magnetic measurements of the Ce/Fe ML. The absence of satellite peaks in the low - angle XRD pattern revealed no artificial layered structure. The above results show that interdiffusion of cerium and iron atoms is extremely fast at RT.
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