Anomalous Hall effect in anatase Ti1-xCoxO2 at low temperature regime
Kazunori Ueno, Tomoteru Fukumura, Hidemi Toyosaki, Masaki Nakano, Masashi Kawasaki
Abstract
Anomalous Hall effect (AHE) of a ferromagnetic semiconductor anatase thin film is studied from 10K to 300K. Magnetic field dependence of anomalous Hall resistance is coincident with that of magnetization, while the anomalous Hall resistance decreases at low temperature in spite of nearly temperature-independent magnetization. Anomalous Hall conductivity sigmaAHE is found to be proportional to the square of Hall mobility, suggesting that charge scattering strongly affects the AHE in this system. The anatase Ti1-xCoxO2 also follows a scaling relationship to conductivity sigmaxx as sigmaAHE ~ sigmaxx1.6, which was observed for another polymorph rutile Ti1-xCoxO2, suggesting an identical mechanism of their AHE.
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