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3 Materials Science Poland

3 2006

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Dendritic domain structures in ultrathin cobalt films

100%

Stefanowicz W. , Tekielak M. , Bucha V. , Maziewski A. , Zablotskii V. , Baczewski L. T. , Wawro A.

Materials Science Poland

2006

tom Vol. 24, No. 3

783--788

We report on study of dendritic domain structures (DDS) in gold enveloped cobalt ultrathin films of thicknesses slightly below the thickness at which the reorientation from perpendicular magnetization state to in-plane state takes place. In these films magnetization reversal undergoes through the dendritic growth of domains. The magnetic aftereffect was observed. We reveal the mechanism and key parameters controlling the dendritic growth of magnetic domains.

Magnetic ordering in ultrathin Co films grown on vicinal substrates

100%

Stupakiewicz A. , Gieniusz R. , Postava K. , Tekielak M. , Maziewski A. , Szerel I. , Wawro A. , Baczewski L. T.

Materials Science Poland

2006

tom Vol. 24, No. 3

659--664

The magnetic anisotropy of ultrathin Au/Co/Au magnetic films epitaxially grown on vicinal monocrystalline (11-20) sapphire substrates with different miscut angles covered with a Mo buffer are investigated by means of ferromagnetic resonance and magnetooptical techniques. Changes of in-plane magnetic anisotropy symmetry were deduced from shape analysis of the magnetization curves and angular dependence of the resonance field measured in the sample plane. Two-fold and four-fold symmetry was observed for different miscut angles. The preference of the domain wall orientation is observed. The experimental data are discussed taking into account the following energy contributions: (i) shape anisotropy; (ii) perpenducular uniaxial anisotropy; (iii) and step-induced uniaxial anisotropy.

An influence of the effective mass on magnetoresistance in ultrathin Fe/Cr/Fe films

84%

Warda K. , Wojtczak L. , Baldomir D. , Pereiro M. , Arias J.

Materials Science Poland

2006

tom Vol. 24, No. 3

731--735

The transport properties of ultrathin metallic sandwich structures of Fe/Cr/Fe are studied as a function of magnetic layers thickness for the current in plane geometry (CIP). Taking into account the band structure obtained from the density functional theory (DFT), we determine the basic physical properties like Fermi energy and relaxation time calculated for each magnetic and spacer layer. Next, using the Boltzmann formalism in its extended form we obtain the results for the magnetoresistance (MR). In particular, we analyze an influence of the effective mass parametrization.