Unveiling the Origin of Multi-Domain Structures in Compositionally Modulated Cylindrical Magnetic Nanowires
Fernandez-Roldan, Jose Angel
P. Del Real, Rafael
Fraile Rodríguez, Arantxa
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Material Science and Engineering Program
Online Publication Date2020-09-24
Print Publication Date2020-10-27
Embargo End Date2021-09-24
Permanent link to this recordhttp://hdl.handle.net/10754/665350
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AbstractCoNi/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.
CitationBran, 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
SponsorsThis 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).
PublisherAmerican Chemical Society (ACS)