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 15.114: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Numerical investigation of geometrically confined domain walls and spin torque using the Heisenberg model — •C. Schieback¹, U. Nowak², M. Kläui¹, D. Backes^1,3, L. J. Heydermann³, F. Junginger¹, R. E. Dunin-Borkowski⁴, U. Rüdiger², and P. Nielaba¹ — ¹Department of Physics, University of Konstanz, 78457 Konstanz, Germany — ²Department of Physics, University of York, York YO10 5DD, UK — ³Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, CH-5232 Villingen PSI, Switzerland — ⁴Department of Material Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, UK

We study systematically the influence of lateral dimensions on the spin structure of domain walls. Computer simulations on a classical spin model are performed for ferromagnetic permalloy nano-structures with lateral constrictions. Thermal activations of the system are taken into account by the numerical solution of the Landau-Lifshitz-Gilbert equation with Langevin dynamics. The domain wall width is found to be strongly correlated with the constriction width. The smaller the constriction width the smaller the domain wall width.

Furthermore we calculate the response of a domain wall to a current due to a spin transfer torque resulting in current-induced domain wall motion. We compute the behavior of domain walls in a one dimensional chain when currents are injected using adiabatic and non-adiabatic spin torque terms. Our results are compared to analytical calculations and are found to agree very well for small current density predictions. The work was supported by the Landesstiftung Baden-Württemberg.