Dipolar coupling effect in magnetic bilayer system
Laboratoire PMTM; CNRS - Université Paris-13, 93430 Villetaneuse, France
2 Laboratoire de Magnétisme et d'Optique, CNRS-Université de Versailles, St. Quentin en Yvelines, 78035 Versailles, France
Corresponding author: a email@example.com
Published online: 15 May 2002
Equilibrium micromagnetic structures in a bilayer system composed of two thin cobalt films separated by a non magnetic spacer are systematically analysed. These 2D magnetization distributions are obtained by numerical computations according to different set of magnetic and geometric parameters. The coupling effect due to the dipolar long range interaction (or stray-field effect) between the two Co layers is studied through the evolution of the magnetic pattern in the stack with or without an applied field and compared to a continuous film of same thickness. Special attention is paid to the hysteresis process in a bilayer. Even though the general aspect of the magnetization distribution looks like a Landau-Lifshitz structure, the absence of any core in the vortex of the magnetic structure is analysed in relation to a possible disappearence of (topological) hysteresis.
PACS: 75.60.Ch – Domain walls and domain structure / 75.70.Cn – Interfacial magnetic properties (multilayers, superlattices) / 75.50.Ss – Magnetic recording materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002