Itinerant ferromagnetism and intrinsic anomalous Hall effect in amorphous iron-germanium

Bouma, D. S.; Chen, Z.; Zhang, B.; Bruni, F.; Flatté, M. E.; Ceballos, A.; Streubel, R.; Wang, L. -W.; Wu, R. Q.; Hellman, F.

doi:10.1103/PhysRevB.101.014402

Title: Itinerant ferromagnetism and intrinsic anomalous Hall effect in amorphous iron-germanium

Journal Article · Thu Jan 02 00:00:00 EST 2020 · Physical Review. B

DOI:https://doi.org/10.1103/PhysRevB.101.014402· OSTI ID:1599458

^[1]; Chen, Z. ^[2]; Zhang, B. ^[3];

^[4];

^[5]; Ceballos, A. ^[6]; Streubel, R. ^[2]; Wang, L. -W. ^[2]; Wu, R. Q. ^[7]; Hellman, F. ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Fudan Univ., Shanghai (China)
Univ. of California, Berkeley, CA (United States)
Univ. of Iowa, Iowa City, IA (United States); Univ. of Chicago, IL (United States); Eindhoven Univ. of Technology (Netherlands)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Engineering Division
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy

© 2020 American Physical Society. The amorphous iron-germanium system (a-FexGe1-x) lacks long-range structural order and hence lacks a meaningful Brillouin zone. The magnetization of a-FexGe1-x is well explained by the Stoner model for Fe concentrations x above the onset of magnetic order around x=0.4, indicating that the local order of the amorphous structure preserves the spin-split density of states of the Fe-3d states sufficiently to polarize the electronic structure despite k being a bad quantum number. Measurements reveal an enhanced anomalous Hall resistivity ρxyAH relative to crystalline FeGe; this ρxyAH is compared to density-functional theory calculations of the anomalous Hall conductivity to resolve its underlying mechanisms. The intrinsic mechanism, typically understood as the Berry curvature integrated over occupied k states but shown here to be equivalent to the density of curvature integrated over occupied energies in aperiodic materials, dominates the anomalous Hall conductivity of a-FexGe1-x (0.38≤x≤0.61). The density of curvature is the sum of spin-orbit correlations of local orbital states and can hence be calculated with no reference to k space. This result and the accompanying Stoner-like model for the intrinsic anomalous Hall conductivity establish a unified understanding of the underlying physics of the anomalous Hall effect in both crystalline and disordered systems.

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Research Organization:: Univ. of California, Irvine, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-05ER46237; AC02-05CH11231

OSTI ID:: 1599458

Alternate ID(s):: OSTI ID: 1599843

Journal Information:: Physical Review. B, Vol. 101, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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