Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.30: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Theory of stripe domains in ferromagnetic multilayers with perpendicular anisotropy — Igor E. Dragunov1,2, Nicolai S. Kiselev1, Ulrich K. Rößler2, and •Alexei N. Bogdanov1,2 — 1Donetsk Institute for Physics and Technology — 2IFW Dresden
Exchange coupled multilayer systems with perpendicular anisotropy, as [CoPt]/Ru, [CoPt]/NiO, Co/Ir, Fe/Au, display magnetic stripe phases as regular equilibrium multidomain states [1]. In contrast to other bulk and nanomagnetic systems, the formation of these multidomain structures is due to the interplay between interlayer exchange and dipolar couplings [2]. We have derived effective micromagnetic equations to calculate the existence regions and geometrical parameters of equilibrium stripe domains and their evolution in a bias field. In multilayers with ferromagnetic exchange coupling the equilibrium parameters can vary in a broad range depending on relative values of the magnetic layer and spacer thicknesses. In superlattices with antiferromagnetic exchange coupling three different ground states can be realized in the system depending on the materials parameters, namely the homogeneous antiferromagnetic state, and multidomain antiferromagnetic and ferromagnetic modes. These results on ground states are represented by magnetic phase diagrams in terms of the materials parameters describing strengths of interlayer exchange coupling, thickness of the ferromagnetic single layer, and number of layers.
[1] O. Hellwig et al., Nature Mater. 2 (2003) 112. [2] U. K. Rößler, A. N. Bogdanov, J. Magn. Magn. Mater. 269 (2004) L287; A. N. Bogdanov, U. K. Rößler, cond-mat/0606671.