Induced Anisotropies in NiCo Obliquely Deposited Films and Their effect on Magnetic Domains

English Article: Oblique and in-plane anisotropies in obliquely evaporated NiCo thin films were investigated in order to understand their origin. All the compositions studied clearly show the effect of columnar grain morphology coupled with some intrinsic factors such as magnetostriction and crystallinity. Energy calculations are undertaken to explain the effect of

MAGNETOSTRICTION AND THERMAL EXPANSION OF CHROMIUM

On a mesuré le coefficient d'expansion thermique α = f(T) ainsi que les magnétostrictions longidutinale λ|| et perpendiculaire λ ⊥ du chrome entre 77 et 340 °K. On a montré que des transitions et des renversements de spins s'accompagnent d'une variation isotrope de volume. Il se produit une concentration thermique du chrome anormale entre 77 et 90 °K.The thermal expansion coefficient α = f(T) and longitudinal and transversal magnetostriction λ|| and λ ⊥ of chromium were measured between 77-340 °K. It has been shown that transitions through the temperatures and spin-flip are accompanied by isotropic change of the volume. Anomalous thermal contraction of chromium occurs between 77-90 °K

Magnetic-field-dependent morphology of self-organized Fe on stepped Si(111) surfaces

The present work reports on Fe thin films grown on vicinal Si(111) substrates via rf magnetron sputtering. The dependencies of the growth mode and magnetic properties of the obtained iron nanostructures on both crystallographic surface orientation and on the direction of the very weak stray magnetic field from the magnetron gun were studied. Scanning tunneling microscopy images showed strong dependence of the Fe grains’ orientation on the stray field direction in relation to the substrate’s steps demonstrating that, under appropriately directed magnetic field, Si surfaces can be used as templates for well-defined self-assembled iron nanostructures. Magneto-optical Kerr effect hysteresis loops showed an easy-axis coercivity almost one order of magnitude smaller for the film deposited with stray field applied along the steps, accompanied with a change in the magnetization reversal mode. Phenomenological models involving coherent rotation and/or domain-wall unpinning were used for the interpretation of these results