Wyniki wyszukiwania - Biblioteka Nauki

1

Photomagnetic effects in cobalt doped garnet films

100%

Maziewski A.

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tom Vol. 31, No. 1

120-120

EN

Photomagnctic effects were observed mainly at cryogenic temperatures in many kinds of magnetic materials, such as garnets, spinels, spin-glasses, magnetite, ferric borates, etc. [1]. The results of the investigation of approximately 10 μm thick Y₂Ca₁Fe₃.₉C₀₀.₁Ge₁O₁₂ samples grown by liquid phase epitaxy on (001) GGG substrate are discussed in this paper. Photomagnctic effects were found [2, 3] in these films up to room temperature. Two types of experiments were performed in order to study light induced changes of: - magnetization orientation in monodomain sample [4], - domain structure geometry [2, 3, 5]. [...]

2

Kronika

45%

Strzałkowski I. , Maziewski A. , Czajka R. , Dietl T. , Sadlej J.

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1999

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tom T. 50, z. 1

47-53

PL

PTF: Zmiana w Zarządzie Głównym, PTF wobec projektów reformy systemu edukacji, Oddział Białostocki, Oddział Poznański. Nominacje profesorskie. Nagrody FNP. Nagroda Nobla z fizyki. Nagroda Nobla z chemii. 50 lat optyki stosowanej. Nowe źródło spójnego promieniowania. Projekt Rubbii nowego napędu rakiet. Petawatt. Faraday kontra komórki. Piknik Naukowy w Warszawie po raz drugi.

3

Dendritic domain structures in ultrathin cobalt films

38%

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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tom 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.

4

Domain structures and magnetization processes in thin Co films with in-plane anisotropy

38%

Jaworowicz J. , Kurant Z. , Postava K. , Maziewski A. , Baczewski L. T. , Wawro A.

Materials Science Poland

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2006

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tom Vol. 24, No. 3

639--642

EN

The magnetization reversal and domain structures in thin Co films in the thickness range 2 nm

5

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

38%

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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tom 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.

6

Study of ultrathin Co films grown on Si(111) substrates

32%

Stupakiewicz A. , Fleurence A. , Gieniusz R. , Maziewski A. , Maroutian T. , Gogol P. , Bartenlian B. , Mégy R. , Beauvillain P.

Materials Science Poland

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2008

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tom Vol. 26, No. 4

1021--1026

EN

Ultrathin Co films were grown on vicinal Si(111) substrate with Cu buffer layers. Room temperature ferromagnetic behaviour of Co layer thicker than 4 monolayers was confirmed by the magneto-optical Kerr effect. Ferromagnetic resonance measurements have proven the coexistence of the magnetocrystalline anisotropy along with the growth- and vicinal induced uniaxial out-of-plane and in-plane contributions. Multi-jump hysteresis loops were observed for selected in-plane orientations of magnetic field which is explained by the competition of different anisotropy contributions.

7

Magnetic ordering in ultrathin Co films grown on vicinal substrates

32%

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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tom 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.

8

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

32%

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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tom 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.

9

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

32%

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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tom 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.

10

Magnetic properties of ultrathin Co(0001) films on vicinal Si(111) substrate

32%

Stupakiewicz A. , Fleurence A. , Gieniusz R. , Maziewski A. , Maroutian T. , Gogol P. , Bartenlian B. , Mégy R. , Beauvillain P.

Materials Science Poland

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2008

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tom Vol. 26, No. 2

295--300

EN

In the present work we report on magnetization reversal process, anisotropy and domain structures in ultrathin Au/Co(0001)/Au films deposited on vicinal Si(111) substrates. The measurements were performed using a magneto-optical Kerr effect based magnetometer, a polarizing optical microscope and a ferromagnetic resonance spectrometer. Co thickness induced spin-reorientation from out-of-plane into in-plane magnetization was studied. Changes of in-plane magnetic anisotropy symmetry were deduced from shapes of magneto-optical hysteresis loops and from analysis of angular dependences of the resonance field. The experimental data have been discussed taking into account both uniaxial out-of-plane anisotropy and step-induced uniaxial in-plane anisotropy. A preferential orientation of domain walls in 3ML thick Co films was observed. The finding is explained by the step-induced magnetic anisotropy.