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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 15.60: Poster

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

Single shot measurement of current- and field-induced domain wall motion in a Permalloy nanowire — •Philipp Möhrke¹, Thomas Moore¹, Mathias Kläui¹, Dirk Backes², Laura Heyderman², and Ulrich Rüdiger¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Paul Scherrer Institut, 5232 Villingen PSI, Switzerland

In order to obtain full information about the stochastic nature of current-induced domain wall (DW) motion [1] in ferromagnetic nanowires, single shot measurements are necessary. We use a focused magneto-optic Kerr effect (MOKE) technique to capture single DW movements in a 500 nm-wide, ∼30 nm-thick Ni₈₀Fe₂₀ wire. A DW is prepared at a specified position, as in [2]. By applying fields H < H_p (depinning field) along the wire direction and concurrently injecting a 50 µs current pulse of ∼2 x 10¹² A/m² to depin the domain wall, we probe the interplay between field- and current-induced domain wall motion, as well as inducing wall motion by current pulses alone (H = 0). Subsequently the wall passes through the focused MOKE laser spot (∼1 µm diameter), which covers a straight section of the wire a few micrometres from the wall’s initial position. The wall motion is detected with sub-nanosecond time resolution, and the experiment is repeated to gather statistics on the wall motion. Depending on the field and current densities applied, wall velocities of 10-100 m/s are observed.

[1] M. Kläui et al., Appl. Phys. Lett. 88 (2006) 232507

[2] M. Kläui et al., Phys. Rev. Lett. 95 (2005) 026601