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Evidence of Skyrmion-Tube Mediated Magnetization Reversal in Modulated Nanowires

Berganza, E.; Marqués-Marchán, J.; Bran, C.; Vazquez, M.; Asenjo, A.; Jaafar, M.

Abstract:
Magnetic nanowires, conceived as individual building blocks for spintronic devices, constitute a well-suited model to design and study magnetization reversal processes, or to tackle fundamental questions, such as the presence of topologically protected magnetization textures under particular conditions. Recently, a skyrmion-tube mediated magnetization reversal process was theoretically reported in diameter modulated cylindrical nanowires. In these nanowires, a vortex nucleates at the end of the segments with larger diameter and propagates, resulting in a first switching of the nanowire core magnetization at small fields. In this work, we show experimental evidence of the so-called Bloch skyrmion-tubes, using advanced Magnetic Force Microscopy modes to image the magnetization reversal process of FeCoCu diameter modulated nanowires. By monitoring the magnetic state of the nanowire during applied field sweeping, a detected drop of magnetic signal at a given critical field unveils the presence of a skyrmion-tube, due to mutually compensating stray field components. That evidences the presence of a skyrmion-tube as an intermediate stage during the magnetization reversal, whose presence is related to the geometrical dimensions of the cylindrical segments.


Verlagsausgabe §
DOI: 10.5445/IR/1000140116
Veröffentlicht am 17.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000140116
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Materials
Verlag MDPI
Band 14
Heft 19
Seiten 5671
Vorab online veröffentlicht am 29.09.2021
Nachgewiesen in Web of Science
Scopus
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