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

100%

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

Materials Science Poland

2007

tom Vol. 25, No. 2

429--433

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.

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

84%

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

Materials Science Poland

2008

tom Vol. 26, No. 4

1021--1026

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.

Magnetic ordering in ultrathin Co films grown on vicinal substrates

84%

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.

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

84%

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

Materials Science Poland

2008

tom Vol. 26, No. 2

295--300

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.