Berlin 2005 – scientific programme
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.76: Poster
Monday, March 7, 2005, 14:00–18:00, Poster TU C
Ground state and constrained domain walls in Gd/Fe multilayers — •Bas B. van Aken1,2, José L. Prieto1, and Neil D. Mathur1 — 1Department of Materials Science, University of Cambridge, Cambridge U.K. — 2present address: Max-Born-Institut, Berlin
The study of spin-polarised transport is key for the understanding of processes involved in spin-electronics. A particular interesting point is the effect of domain walls (DWs) on the transport properties of ferromagnetic materials. The magnetic ground state of antiferromagnetically coupled Gd/Fe multilayers and the evolution of in-plane domain walls is modelled with micromagnetics. The twisted state is characterised by a rapid decrease of the interface angle with increasing magnetic field. We found that for certain ratios of the Gd and Fe layer thicknesses, the twisted state is already present at low fields. However, the magnetic ground state is not only determined by the layer thickness ratio, or magnetic moment ratio. It is also effected by the thicknesses of the layers, that is the total moment of each layer. The dependence of the magnetic ground state is explained by the amount of overlap of the domain walls at the interface. Thicker layers suppress the Fe aligned state and the Gd aligned state in favour of the twisted state. On the contrary, ultrathin layers exclude the twisted state, since wider domain walls can not form in these ultrathin layers.