Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Magnetic domain walls
MA 9.11: Vortrag
Montag, 12. März 2018, 17:45–18:00, EB 202
Wire edge dependent magnetic domain wall creep — •Liza Herrera Diez1, Vincent Jeudy2, Gianfranco Durin3, Arianna Casiraghi3, Juergen Langer4, Berthold Ocker4, and Dafiné Ravelosona1 — 1Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, C2N Orsay, 91405 Orsay cedex, France — 2Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France — 3Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy — 4Singulus Technology AG, Hanauer Landstrasse 103, 63796 Kahl am Main, Germany
While edge pinning is known to play an important role in sub-µm wires, we demonstrate that strong deviations from the universal creep law can occur in 1 to 200µm wide wires. Edge pinning increasingly dominates the creep dynamics as the wire width decreases and it is also found to depend on aging and different fabrication processes. Magnetic imaging reveals that edge pinning deviations correlate with a marked bending of domain walls at low drive. This behaviour is described by a mixed-creep mechanism combining the creep law exponent µ =1/4 describing bulk pinning and an additional component accounting for edge pinning with an exponent of 0.38.