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Observation of a topologically protected state in a magnetic domain wall stabilized by a ferromagnetic chemical barrier

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Ruiz Gómez, Sandra and Mascaraque Susunaga, Arantzazu and Pérez García, Lucas and Foerster, Michael and Aballe, Lucía and Proenca, M. P. and Lucas, Irene and Prieto, José Luis and Figuera, Juan de la and Quesada, Adrián (2018) Observation of a topologically protected state in a magnetic domain wall stabilized by a ferromagnetic chemical barrier. Scientific reports, 8 . ISSN 2045-2322

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Official URL: http://dx.doi.org/10.1038/s41598-018-35039-6


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Abstract

The precise control and stabilization of magnetic domain walls is key for the development of the next generation magnetic nano-devices. Among the multitude of magnetic configurations of a magnetic domain wall, topologically protected states are of particular interest due to their intrinsic stability. In this work, using XMCD-PEEM, we have observed a topologically protected magnetic domain wall in a ferromagnetic cylindrical nanowire. Its structure is stabilized by periodic sharp alterations of the chemical composition in the nanowire. The large stability of this topologically protected domain wall contrasts with the mobility of other non-protected and non-chiral states also present in the same nanowire. The micromagnetic simulations show the structure and the conditions required to find the topologically protected state. These results are relevant for the design of future spintronic devices such as domain wall based RF oscillators or magnetic memories.


Item Type:Article
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© 2018 The Author(s) This work is supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through Projects MAT2014-52477-C5-1-P, 2-P, MAT2015-64110-C2-1-P, 2-P and MAT2017-87072-C4-2-P and by Portuguese FCT and COMPETE 2020, under project POCI-01-0145-FEDER-028676. IMDEA Nanociencia acknowledges support from the Severo Ochoa Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). MPP acknowledges FCT for grant SFRH/BPD/84948/2012. SRG acknowledges MINECO for FPI fellowship.

Uncontrolled Keywords:Skyrmions
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:50638
Deposited On:11 Jan 2019 15:52
Last Modified:16 Jan 2019 10:46

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