2024-03-29T09:14:07Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1375772016-10-04T00:52:42Zcom_10261_28com_10261_4com_10261_28457com_10261_3col_10261_407col_10261_28464
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Vélez, María
author
Blanco-Roldán, C.
author
Quirós, Carlos
author
Hierro-Rodríguez, A.
author
Álvarez-Prado, L. M.
author
Duch Llobera, Marta
author
Torras Andrés, Núria
author
Esteve i Tintó, Jaume
author
Martín, José Ignacio
author
Martín, José Ignacio
author
Ferrer, S.
author
2015
Domain 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.
ICM 2015
http://hdl.handle.net/10261/137577
Magnetization reversal and topological defects in weak perpendicular anisotropy bifurcations