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ReportsDissipationless Anomalous Hall Current in the Ferromagnetic Spinel CuCr2Se4-xBrx
In a ferromagnet, an applied electric field E invariably produces an anomalous Hall current JH that flows perpendicular to the plane defined by E and M (the magnetization). For decades, the question of whether JH is dissipationless (independent of the scattering rate) has been debated without experimental resolution. In the ferromagnetic spinel CuCr2Se4–xBrx, the resistivity
1 Department of Physics, Princeton University, Princeton, NJ 08544, USA. * Present address: Center for Crystal Science and Technology, University of Yamanashi, 7 Miyamae, Kofu, Yamanashi 400-8511, Japan.
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(at low temperature) may be increased by several decades by varying x (Br) without degrading M. We show that JH/E (normalized per carrier, at 5 kelvin) remains unchanged throughout. In addition to confirming the dissipationless nature of JH, our finding has implications for the generation and study of spin-Hall currents in bulk samples. 
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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