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    Crystallographically driven magnetic behaviour of arrays of monocrystalline Co nanowires

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    Type
    Article
    Authors
    Ivanov, Yurii P. cc
    Trabada, Daniel G.
    Chuvilin, Andrey L.
    Kosel, Jürgen cc
    Chubykalo-Fesenko, Oksana A.
    Vázquez., Manuel M.
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Sensing, Magnetism and Microsystems Lab
    Date
    2014-11-07
    Online Publication Date
    2014-11-07
    Print Publication Date
    2014-11-28
    Permanent link to this record
    http://hdl.handle.net/10754/563847
    
    Metadata
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    Abstract
    Cobalt nanowires, 40 nm in diameter and several micrometers long, have been grown by controlled electrodeposition into ordered anodic alumina templates. The hcp crystal symmetry is tuned by a suitable choice of the electrolyte pH (between 3.5 and 6.0) during growth. Systematic high resolution transmission electron microscopy imaging and analysis of the electron diffraction patterns reveals a dependence of crystal orientation from electrolyte pH. The tailored modification of the crystalline signature results in the reorientation of the magnetocrystalline anisotropy and increasing experimental coercivity and squareness with decreasing polar angle of the 'c' growth axis. Micromagnetic modeling of the demagnetization process and its angular dependence is in agreement with the experiment and allows us to establish the change in the character of the magnetization reversal: from quasi-curling to vortex domain wall propagation modes when the crystal 'c' axis tilts more than 75° in respect to the nanowire axis.
    Sponsors
    Financial support from the Spanish Ministry of Science and Innovation, MCINN, under Project No. MAT2010-20798C05-01 and FIS2010-20979-C02-02 is acknowledged, as well as of the Far Eastern Federal University. A Chuvilin acknowledges the financial support from the Basque Government within the projects CTP11-P14 and Etortek IE11-304. Yu P Ivanov thanks the financial support provided by SABIC. Thanks are due also to C Checa and A Valera for assistance in the SEM characterization.
    Publisher
    IOP Publishing
    Journal
    Nanotechnology
    DOI
    10.1088/0957-4484/25/47/475702
    PubMed ID
    25380279
    ae974a485f413a2113503eed53cd6c53
    10.1088/0957-4484/25/47/475702
    Scopus Count
    Collections
    Articles; Electrical Engineering Program; Sensing, Magnetism and Microsystems Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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