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Magnetic properties of (Co/Au)N multilayers with various numbers of repetition N

Mazalski P., Sveklo I., Tekielak M., Kolendo A., Maziewski A., Kuświk P., Szymański B., Stobiecki F.

Materials Science Poland

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2007

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Vol. 25, No. 4

1289--1294

EN

Magnetization reversal processes and magnetic domain structures have been studied in multilayered systems consisting of magnetostatically coupled cobalt layers separated by non-magnetic/soft-magnetic ones. Observations of the domain structures have been performed at room temperature using Kerr microscopy and magnetic force microscopy technique. The studies have been focused on the key characteristics of magnetic hysteresis loops as well as the domain structures and domain periods in such systems.

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In-plane magnetic anisotropy symmetry in ultrathin Co films grown on sapphire substrates

Stupakiewicz A., Maziewski A., Trzciński P., Baczewski L. T., Wawro A., Kalinowski R.

Materials Science Poland

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2007

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Vol. 25, No. 2

429--433

EN

We report on the study of in-plane magnetic anisotropy and magnetization reversal in MBE grown ultrathin epitaxial Mo/Au/Co/Au magnetic films. We used a magneto-optical polar Kerr effect-based magnetometer and real-time data analysis using LabView software. A two-fold in-plane magnetic anisotropy symmetry was deduced from the shape analysis of the magnetization curves measured for various directions of in-plane applied magnetic field. The direction of easy magnetization axis in the sample plane is a result of a small, unintentional miscut of the sapphire substrate found by in-situ STM and X-ray diffraction measurements.

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Image processing study of ultrathin cobalt domain structure evolution induced by overlayer structure

Dobrogowski W., Kurant Z., Nedzved A., Stefanowicz W., Tekielak M., Baczewski L. T., Wawro A., Maziewski A.

Materials Science Poland

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2007

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Vol. 25, No. 2

403--410

EN

Evolution of the domain structure (DS) in ultrathin cobalt films, deposited on sapphire substrate with the following structure: X\Au\Co(dCo nm thick layer or wedge)\X (dX nm thick layer or wedge perpendicular to Co wedge axis)\Au (where X is V or Mo) with perpendicular magnetization was investigated as a function of thickness dX. The study was performed using an optical polarizing microscope with CCD camera. Images of DS were recorded during various stages of magnetization reversal. A special software based on LabViewŽ was employed for acquisition and processing of domain images. To analyze the observed domain structures, topology properties of magnetic images were determined. Preferential orientation of domain walls was found in ultrathin Co covered by Mo but not by V.

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Magnetic ordering in ultrathin Co films grown on vicinal substrates

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

Materials Science Poland

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2006

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Vol. 24, No. 3

659--664

EN

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.

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Dendritic domain structures in ultrathin cobalt films

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

Materials Science Poland

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2006

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Vol. 24, No. 3

783--788

EN

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.