Roughness of moving domain walls in magnetic thin films

ALBORNOZ, LUCAS J.; CORTÉS BURGOS, MARÍA JOSÉ; GURUCIAGA, PAMELA C.; JORDÁN, DANIEL; QUINTEROS, CYNTHIA P.; AGORITSAS, ELISABETH; JEUDY, VINCENT; GRANADA, MARA; CURIALE, JAVIER; BUSTINGORRY, SEBASTIAN

Venecia

Conferencia; Trends in Magnetism (TMAG 2022); 2022

PETASPIN

Domain wall dynamics and spatial fluctuations are closely related to each other and touniversal features of disordered systems [1]. Experimentally measured roughness exponentscharacterizing spatial fluctuations have been reported for magnetic thin films, with valuesgenerally different from those predicted by the equilibrium, depinning, and thermal referencestates. Here we study the roughness of domain walls in GdFeCo and Pt/Co/Pt thin films fordifferent values of magnetic field and temperature [2,3]. Our analysis is performed in the framework of a model considering length-scale crossoversbetween the reference states, which is shown to bridge the differences between experimentalresults and theoretical predictions. As shown in Figure 1 for Pt/Co/Pt, we are able toexperimentally determine the crossover length scales between roughness reference sates.[1]  A. B. Kolton, A. Rosso, T. Giamarchi, W. Krauth, Phys. Rev. B 74 (2009), 184207.[2]  L. J. Albornoz, P. C. Guruciaga, V. Jeudy, J. Curiale, S. Bustingorry, Phys. Rev. B 104 (2021), 024203.[3] M. J. Cortés Burgos, P. C. Guruciaga, D. Jordán, C. P. Quinteros, E. Agoritsas, J. Curiale, M. Granada, S. Bustingorry, Phys. Rev. B 104 (2021), 144202.