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Article

Evidence of Skyrmion-Tube Mediated Magnetization Reversal in Modulated Nanowires

1
Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2
Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Cientificas (CSIC), Campus de Cantoblanco, C. Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
3
Departamento de Física de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Avda. Francisco Tomás y Valiente 7, 28049 Madrid, Spain
4
Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Avda. Francisco Tomás y Valiente 7, 28049 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Lucia Nasi
Materials 2021, 14(19), 5671; https://doi.org/10.3390/ma14195671
Received: 31 August 2021 / Revised: 24 September 2021 / Accepted: 27 September 2021 / Published: 29 September 2021
(This article belongs to the Special Issue Development and Applications of Force Microscopy Techniques)
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. View Full-Text
Keywords: magnetic nanowires; skyrmion tube; magnetization reversal process; magnetic force microscopy magnetic nanowires; skyrmion tube; magnetization reversal process; magnetic force microscopy
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MDPI and ACS Style

Berganza, E.; Marqués-Marchán, J.; Bran, C.; Vazquez, M.; Asenjo, A.; Jaafar, M. Evidence of Skyrmion-Tube Mediated Magnetization Reversal in Modulated Nanowires. Materials 2021, 14, 5671. https://doi.org/10.3390/ma14195671

AMA Style

Berganza E, Marqués-Marchán J, Bran C, Vazquez M, Asenjo A, Jaafar M. Evidence of Skyrmion-Tube Mediated Magnetization Reversal in Modulated Nanowires. Materials. 2021; 14(19):5671. https://doi.org/10.3390/ma14195671

Chicago/Turabian Style

Berganza, E., J. Marqués-Marchán, C. Bran, M. Vazquez, A. Asenjo, and M. Jaafar. 2021. "Evidence of Skyrmion-Tube Mediated Magnetization Reversal in Modulated Nanowires" Materials 14, no. 19: 5671. https://doi.org/10.3390/ma14195671

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