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    Unveiling the Origin of Multi-Domain Structures in Compositionally Modulated Cylindrical Magnetic Nanowires

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    PDFsam_ACS Nano-Madrid.pdf
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    Accepted manuscript
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    Type
    Article
    Authors
    Bran, Cristina
    Fernandez-Roldan, Jose Angel
    P. Del Real, Rafael
    Asenjo, Agustina
    Chen, Yu-Shen
    Zhang, Junli
    Zhang, Xixiang cc
    Fraile Rodríguez, Arantxa
    Foerster, Michael
    Aballe, Lucia
    Chubykalo-Fesenko, Oksana
    Vazquez, Manuel
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering Program
    Date
    2020-09-24
    Online Publication Date
    2020-09-24
    Print Publication Date
    2020-10-27
    Embargo End Date
    2021-09-24
    Permanent link to this record
    http://hdl.handle.net/10754/665350
    
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    Abstract
    CoNi/Ni multisegmented cylindrical nanowires were synthesized via electrochemical route. The wires are 140 nm in diameter, with 1000 nm long Ni segments, and CoNi segments between 600 and 1400 nm in length. The magnetic configuration was imaged by XMCD-PEEM in the demagnetized state and at remanence after magnetizing axially and perpendicularly. Ni segments, with cubic crystal symmetry, show an axial magnetic configuration with a small curling component at the surface. In turn, CoNi segments, with hexagonal crystal symmetry and a strong magnetocrystalline anisotropy perpendicular to the nanowires, show a single vortex state in the shorter segments and multi-vortex or multi-transverse magnetic configurations in medium and long segments, respectively. A detailed study by micromagnetic simulations reveals that the magnetic configuration is determined mainly by the coupling between soft Ni and harder CoNi segments. For short CoNi segments, Ni segments are magnetostatically coupled and the chirality of the single vortex formed in CoNi remains the same as that of the curling in neighbouring Ni segments. For longer CoNi segments, the remanent state is either multi-vortex or multi-transverse state depending on whether the previously applied field was parallel or perpendicular to the magnetocrystalline axis. The results point out the relevance of the cylindrical geometry to promote the occurrence of complex magneto-chiral effects and provide key information for the design of cylindrical magnetic nanowires for multiple applications.
    Citation
    Bran, C., Fernandez-Roldan, J. A., P. Del Real, R., Asenjo, A., Chen, Y.-S., Zhang, J., … Vazquez, M. (2020). Unveiling the Origin of Multi-Domain Structures in Compositionally Modulated Cylindrical Magnetic Nanowires. ACS Nano. doi:10.1021/acsnano.0c03579
    Sponsors
    This investigation has been carried out under the support of Spanish MINECO under project MAT2016-76824-C3-1-R, FIS2016–78591-C3-3-R and the Regional Government of Madrid under project S2018/NMT-4321 NANOMAGCOST-CM. LA and MF acknowledge funding through RTI2018-095303-B-C53. AFR acknowledges support from the Spanish MINECO (MAT2015-68772-P). We also acknowledge the service from the MiNa Laboratory at IMN, and funding from CM (project SpaceTec, S2013/ICE2822), MINECO (project CSIC13-4E-1794) and EU (FEDER, FSE).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/acsnano.0c03579
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsnano.0c03579
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsnano.0c03579
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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