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Magnetization reversal and topological defects in weak perpendicular anisotropy bifurcations

AuthorsVélez, María ; Blanco-Roldán, C.; Quirós, Carlos ; Hierro-Rodríguez, A. ; Álvarez-Prado, L. M. ; Duch Llobera, Marta; Torras Andrés, Núria; Esteve i Tintó, Jaume; Martín, José Ignacio ; Martín, José Ignacio ; Ferrer, S.
Issue Date2015
CitationICM 2015
AbstractDomain wall propagation in magnetic nanostructures with in‐plane magnetic anisotropy is strongly affected by the presence of edge topological defects (half vortices and antivortices) that can be tuned by the system geometry (antidots, notches in nanowires, bifurcations, à). Nanostructured weak perpendicular anisotropy materials, with comparable in‐plane and out‐of‐plane magnetization components, introduce an additional complexity in which in‐plane half‐vortices can become coupled to topological defects in the out‐of‐plane magnetization stripe pattern (dislocations and disclinations). In this work we have studied domain wall propagation in magnetic bifurcations of weak perpendicular anisotropy amorphous Nd‐Co alloy. The samples have been fabricated by a combined e‐beam lithography, cosputtering and lift-‐off process on Si3N4 membranes and Si substrates. Samples were patterned in an “Y” geometry, 50 nm thick, 1 micron wide and 10 micron long. Magnetization reversal has been studied by magnetic Transmission X‐ray Microscopy, Kerr microscopy and Magnetic Force Microscopy. First, a large in‐plane field is applied along the “Y” symmetry direction in order to define in‐plane easy axis. Then, a series of transverse field pulses allows us to nucleate and propagate a vortex wall in the nanostructure. This process results in an asymmetric configuration of each “Y” branch and modifies stripe domain configuration at the bifurcation due to the coupling between in‐plane and out‐of‐plane topological defects.
DescriptionResumen del trabajo presentado a la 20th International Conference on Magnetism, celebrada en Barcelona (España) del 5 al 10 de julio de 2015.-- et al.
Appears in Collections:(IMB-CNM) Comunicaciones congresos
(CINN) Comunicaciones congresos
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