Journal Article

PreJuSER-17662

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Anisotropic intrinsic anomalous Hall effect in ordered 3dPt alloys

Zhang, H.FZJ* ; Blügel, S.FZJ* ; Mokrousov, Y.FZJ*

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10901  doi:10.1103/PhysRevB.84.024401

Abstract: By performing first-principles calculations, we investigate the intrinsic anomalous Hall conductivity (AHC) and its anisotropy in ordered L1(0) FePt, CoPt, and NiPt ferromagnets and their intermediate alloys. We demonstrate that the AHC in this family of compounds depends strongly on the direction of the magnetization M in the crystal. We predict that such pronounced orientational dependence in combination with the general decreasing trend of the AHC when going from FePt to NiPt leads to a sign change of the AHC upon rotating the magnetization direction in the crystal of CoPt alloy. We also suggest that, for a range of concentration x in CoxNi1-xPt and FexCo1-xPt alloys, it is possible to achieve a complete quenching of the anomalous Hall current for a certain direction of the magnetization in the crystal. By analyzing the spin-resolved AHC in 3dPt alloys, we endeavor to relate the overall trend of the AHC in these compounds to the changes in their densities of d states around the Fermi energy upon varying the atomic number. Moreover, we show the generality of the phenomenon of anisotropic anomalous Hall effect by demonstrating its occurrence within the three-band tight-binding model.

Keyword(s): J

Note: We acknowledge discussions with I. Souza and F. Freimuth. This work was supported by the HGF-YIG Program VH-NG-513. Computational resources were provided by Julich Supercomputing Centre.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)
2. Quanten-Theorie der Materialien (IAS-1)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

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