Scaling of the anomalous Hall effect in lower conductivity regimes

Karel, J.; Bordel, C.; Bouma, D. S.; de Lorimier-Farmer, A.; Lee, H. J.; Hellman, F.

doi:10.1209/0295-5075/114/57004

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Scaling of the anomalous Hall effect in lower conductivity regimes

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Karel, J.
Julie Karel, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Karel, J., Bordel, C., Bouma, D. S., de Lorimier-Farmer, A., Lee, H. J., & Hellman, F. (2016). Scaling of the anomalous Hall effect in lower conductivity regimes. EPL, 114(5): 57004, pp. 1-6. doi:10.1209/0295-5075/114/57004.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-245E-B

Abstract

The scaling of the anomalous Hall effect (AHE) was investigated using amorphous and epitaxial FexSi1-x (0.43 < x < 0.71) magnetic thin films by varying the longitudinal conductivity (sigma(xy)) using two different approaches: modifying the carrier mean free path (l) with chemical or structural disorder while holding the carrier concentration (n(h)) constant or varying n(h) and keeping l constant. The anomalous Hall conductivity (sigma(xy)), when suitably normalized by magnetization and n(h), is shown to be independent of sigma(xx) for all samples. This observation suggests a primary dependence on an intrinsic mechanism, unsurprising for the epitaxial high conductivity films where the Berry phase curvature mechanism is expected, but remarkable for the amorphous samples. That the amorphous samples show this scaling indicates a local atomic level description of a Berry phase, resulting in an intrinsic AHE in a system that lacks lattice periodicity. Copyright (C) EPLA, 2016