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ε-iron nitrides: Intrinsic anomalous Hall ferromagnets
11.Z. Fang, N. Nagaosa, K. S. Takahashi, A. Asamitsu, R. Mathieu, T. Ogasawara, H. Yamada, M. Kawasaki, Y. Tokura, and K. Terakura, Science 302, 92 (2003).
17.R. D. Cowan, The Theory of Atomic Structure and Spectra (University of California Press, Berkeley, 1981).
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The anomalous Hall effect in ε-iron nitrides (ε-Fe3-x
N, 0 ≤ x ≤ 1) has been systematically investigated taking advantage of the fact that the exchange splitting of ε-Fe3-x
N can be continuously tuned through the nitrogen concentration. It has been found that the anomalous Hall conductivity,
, is proportional to the saturation
, across significant variations in the saturation
magnetization (96–1146 emu/cc). This relationship is in excellent agreement with the intrinsic mechanism as well as with the unified theory of AHE. Our results also demonstrate that the anomalous Hall conductivity is sensitive to the exchange splitting of the band structure.
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