Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.25: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Temperature dependence of stochastic domain-wall depinning in permalloy nanowires — •Clemens Wuth, Peter Lendecke, and Guido Meier — Universität Hamburg, Institut für Angewandte Physik, Jungiusstraße 11, 20355 Hamburg

We investigate the temperature dependence of domain-wall depinning in permalloy nanowires by measuring depinning fields and their corresponding depinning times as a function of bias field. The domain walls are pinned at triangular notches in the nanowires and detected non-invasively by Hall micromagnetometry [1,2]. This technique allows to acquire depinning-field and -time distributions in the temperature range between 5 K and 50 K and thus to determine the stochastics of the domain-wall depinning process. The results are discussed in terms of the Néel-Brown model for thermally activated magnetization reversal [3] and aim for a better understanding of field-induced domain-wall depinning.

[1] P. Lendecke, R. Eiselt, G. Meier, and U. Merkt, J. Appl. Phys. 103, 073909 (2008), [2] P. Lendecke, U. Merkt, and G. Meier, J. Magn. Magn. Mat. 322, 1399 (2010), [3] W. Wernsdorfer, Adv. Chem. Phys. 118, 99 (2001).