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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Zhang, Qiang
Wen, Yan
Zhao, Yuelei
Li, Peng

He, Xin

Zhang, Junli

He, Yao
Peng, Yong
Yu, Ronghai
Zhang, Xixiang

KAUST Department
Imaging and Characterization Core LabMaterial Science and Engineering Program
Nanofabrication Core Lab
Physical Characterization
Physical Science and Engineering (PSE) Division
Thin Films & Characterization
Date
2017-09-04Online Publication Date
2017-09-04Print Publication Date
2017-10-18Permanent link to this record
http://hdl.handle.net/10754/625302
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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 PublishingPubMed ID
28758897Additional Links
http://iopscience.iop.org/article/10.1088/1361-648X/aa8315ae974a485f413a2113503eed53cd6c53
10.1088/1361-648x/aa8315
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