Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.74: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Bloch- to cross-tie wall transformation by pulsed magnetic fields — •Andreas Neudert, Jeffrey McCord, Rudolf Schäfer, and Ludwig Schultz — IFW Dresden, Postfach 270116, 01171 Dresden

The internal structure of 180^∘ domain walls in ferromagnetic films depends strongly on the thickness of the film. In thick films (thickness > 100 nm) domain walls of the asymmetric Bloch type are energetically favoured compared to cross-tie walls. We investigated an asymmetric Bloch wall in a 80x160 µm² permalloy rectangle of 160 nm thickness using static and time-resolved Kerr microscopy. By applying a repetitive pulsed magnetic field (amplitude 1.6 kA/m, width 800 ps, repetition rate 23 MHz) the Bloch wall is unexpectedly transformed into a cross-tie wall. After switching off the pulsed magnetic field this new domain wall still exists, although for permalloy films of this thickness asymmetric Bloch walls are energetically favoured. The influence of magnetic inhomogeneities and pulsed field parameters on this wall transformation will be discussed.