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MA: Fachverband Magnetismus

MA 9: Magnetic domain walls

MA 9.11: Talk

Monday, March 12, 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.