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2 Materials Science Poland

2 2008

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

100%

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

100%

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.