Showing papers by "Andrzej Maziewski published in 2002"
TL;DR: The silver overlayer thickness-driven magnetic reorientation from easy axis to easy plane generates a new type of 90 degrees magnetic wall for cobalt thicknesses between 1.3 and 1.8 nm.
Abstract: Complementary multiscale magneto-optical studies based on the polar Kerr effect are carried out on an ultrathin cobalt wedge covered with a silver wedge and subsequently with the Au thick layer. A few monolayers of Ag are found to have a substantial effect on magnetic anisotropy, the coercivity field, and Kerr rotation. The silver overlayer thickness-driven magnetic reorientation from easy axis to easy plane generates a new type of 90 degrees magnetic wall for cobalt thicknesses between 1.3 and 1.8 nm. The tuning of the wall width in a wide range is possible. Tailoring of the overlayer structure can be used for ultrathin film magnetic patterning.
82 citations
TL;DR: In this article, the authors considered ultrathin magnetic films where the thickness-induced second-order phase transition occurs due to surface magnetic anisotropy changes and derived the exact determination of stripe domain period, p, applying the transcendent Lerch functions to the classical Kooy-Enz model.
Abstract: Ultrathin magnetic films are considered where the thickness-induced second order phase transition occurs due to surface magnetic anisotropy changes. By increasing the thickness, the easy magnetization axis state passes through the easy cone state (for film thickness t: t 1 < t < t 2 ) into the easy magnetization plane state. The characteristic material length l c (defined as the ratio of the domain wall energy density to the demagnetization energy) was calculated up to thickness t 2 . The exact determination of stripe domain period, p, was proposed, applying the transcendent Lerch functions to the classical Kooy-Enz model. Near t 2 where l c vanishes, the critical period, p c , was also discussed. Considering real sets of material parameters taken for ultrathin cobalt films, it was found that by increasing the thickness, the equilibrium domain period drastically decreases from practically infinity (many kilometers for t = 0.5 nm) into the nanometer scale near t 2 .
15 citations
TL;DR: In this paper, the structural and magnetic properties of ultrathin Co films were studied by scanning tunneling microscopy and magneto-optics and it was shown that the critical thickness decreases for annealed films.
12 citations
TL;DR: In this paper, the optimum growth conditions of epitaxial Au/Co/Au sandwiches with a strong perpendicular magnetic anisotropy were investigated by means of reflection high-energy electron diffraction and Auger electron spectroscopy.
10 citations
TL;DR: In this paper, trathin cobalt films and wedges in gold envelope Au/Co(d Co 0) were determined for samples with different thicknesses for different types of annealing induced in the sample.
Abstract: Ultrathin cobalt films and wedges in gold envelope Au/Co(d Co 0) were determined for samples with different thicknesses. Annealing induced in the sample: (i) flattening of the cobalt surface; (ii) a decrease of the coercivity field and magnetic anisotropy caused a decrease of thickness of reorientation from easy axis state to easy plane one; (iii) an increase of the Barkhausen volume which contains many cobalt islands creating the chains. Approaching the reorientation region, the character of the magnetization reversal drastically changes from that with the preference of domain wall propagation into the one connected to the domain wall nucleation.
7 citations
TL;DR: In this paper, the polar Kerr effect was used to determine the magnetic anisotropy constants of ultrathin cobalt wedges in a wide thickness range, and a second order phase transition occurred from an easy magnetization axis through an easy cone into an easy plane state.
3 citations
TL;DR: In this paper, the authors observed the spectra of linear dichroism induced by a magnetic field are observed in a cobalt-doped yttrium iron garnet (YIG:Co) film grown in the (001) plane.
Abstract: The spectra of linear dichroism induced by a magnetic field are observed in a cobalt-doped yttrium iron garnet (YIG:Co) film grown in the (001) plane. The linear dichroism spectra are highly sensitive to the orientation of the magnetic field. The spectrum measured with the magnetic field directed along the crystallographic axis [100] turned out to have a form identical to the spectrum of the “rigid” photoinduced linear dichroism, known from earlier experiments. The similarity of these spectra may be regarded as evidence of the magnetic origin of the major part of the optical anisotropy induced by light with polarization E∥[100] in the nonmagnetized YIG:Co film.