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    Skew scattering dominated anomalous Hall effect in $Co_{x} (MgO)_{100-x}$ granular thin films

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    Zhang+et+al_2017_J._Phys.__Condens._Matter_10.1088_1361-648X_aa8315.pdf
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    Type
    Article
    Authors
    Zhang, Qiang cc
    Wen, Yan
    Zhao, Yuelei
    Li, Peng cc
    He, Xin cc
    Zhang, Junli cc
    He, Yao
    Peng, Yong
    Yu, Ronghai
    Zhang, Xixiang cc
    KAUST Department
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Nanofabrication Core Lab
    Physical Characterization
    Physical Science and Engineering (PSE) Division
    Thin Films & Characterization
    Date
    2017-09-04
    Online Publication Date
    2017-09-04
    Print Publication Date
    2017-10-18
    Permanent link to this record
    http://hdl.handle.net/10754/625302
    
    Metadata
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    Abstract
    We investigated the mechanism(s) of the anomalous Hall effect (AHE) in magnetic granular materials by fabricating 100-nm-thick thin films of $Co_{x} (MgO)_{100-x}$ with a Co volume fraction of $34 \le x \le 100$ using co-sputtering at room temperature. We measured the temperature dependence of longitudinal resistivity ($\rho_{XX}$) and anomalous Hall resistivity ($\rho_{AHE}$) from 5 K to 300 K in all samples. We found that when x decreases from 100 to 34, the values of $\rho_{XX}$ and $\rho_{AHE}$ respectively increased by about four and three orders in magnitude. By linearly fitting the data, obtained at 5 K, of anomalous Hall coefficient ($R_{s}$) and of $\rho_{XX}$ to $log({R}_{s})~ \gamma log(\rho_{XX})$, we found that our results perfectly fell on a straight line with a slope of $\gamma$ = 0.97±0.02. This fitting value of $\gamma$ in ${R}_{s} \varpropto \rho_{XX}$ clearly suggests that skew scattering dominated the AHE in this granular system. To explore the effect of the scattering on the AHE, we performed the same measurements on annealed samples. We found that although both$\rho_{XX}$ and ($\rho_{AHE}$) significantly reduced after annealing, the correlation between them was almost the same, which was confirmed by the fitted value, $\gamma$ =0.99±0.03. These data strongly suggest that the AHE originates from the skew scattering in Co-MgO granular thin films no matter how strong the scatterings of electrons by the interfaces and defects is. This observation may be of importance to the development of spintronic devices based on MgO.
    Citation
    Zhang Q, Wen Y, Zhao Y, Li P, He X, et al. (2017) Skew scattering dominated anomalous Hall effect in Cox(MgO)100-x granular thin films. Journal of Physics: Condensed Matter. Available: http://dx.doi.org/10.1088/1361-648x/aa8315.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). QZ and PL acknowledge financial support from KAUST sensor project (REP/1/2708-01). XH acknowledges financial support from KAUST sensor project (REP/1/2719-01).
    Publisher
    IOP Publishing
    Journal
    Journal of Physics: Condensed Matter
    DOI
    10.1088/1361-648x/aa8315
    PubMed ID
    28758897
    Additional Links
    http://iopscience.iop.org/article/10.1088/1361-648X/aa8315
    ae974a485f413a2113503eed53cd6c53
    10.1088/1361-648x/aa8315
    Scopus Count
    Collections
    Nanofabrication Core Lab; Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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