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 15.73: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Geometrically Confined Domain Walls — •Daniel Bedau1, Mathias Kläui1, Ulrich Rüdiger1, Dirk Backes2, and Laura Heyderman2 — 1Universität Konstanz — 2PSI Villigen
Magnetic domain walls (DWs) that are geometrically confined exhibit unique quasi-particle features. Depending on the geometry two basic spin configurations for head-to-head domain walls exists, which are called vortex walls and transverse walls. We present phase diagrams for the domain wall types [1] and demonstrate thermally activated transformations between the wall types, from which we estimate the energy barrier separating the two types [2].
Using magnetic rings in an external rotating field the domain wall can be positioned at any position along the ring, and the position of the domain wall can be accurately determined using magnetoresistance measurements. Applying this method we determine the wall propagation fields and the details of pinning at geometrical variations. [3-5]
Using electron holography we map the stray field of transverse and vortex walls and find that transverse walls can strongly interact for sufficiently small spacings leading to a shift in the phase boundary [6]. Quantitative measurements allow us to determine the statistical distribution of energy barriers for the vortex core nucleation [6].
[1] M. Kläui et al., Appl. Phys. Lett. 85, 5637 (2004) [2] M. Laufenberg et al., Appl. Phys. Lett. 88, 052507 (2006) [3] M. Kläui et al., Phys. Rev. Lett. 90, 97202 (2003) [4] M. Kläui et al., Appl. Phys. Lett. 87, 102509 (2005) [5] D. Bedau et al., J. Appl. Phys., (in press 2007) [6] M. Laufenberg et al., Appl. Phys. Lett. 88, 212510 (2006)