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MA: Fachverband Magnetismus

MA 24: Magnetic Heusler Compounds

MA 24.2: Vortrag

Dienstag, 17. März 2020, 09:45–10:00, HSZ 403

Spin-Resolved Bulk Electronic Structure Analysis of the Half-Metallic Heusler Ferromagnet Co₂MnSi — •S. Chernov¹, S. Babenkov¹, D. Vasilyev¹, K. Medjanik¹, O. Fedchenko¹, M. Jourdan¹, S. Andrieu², C. Guillemard², F. Bertran³, P. LeFevre³, M. Schmitt⁴, C. Schlueter⁵, Yu. Matveyev⁵, A. Gloskowski⁵, R. Claessen⁴, H.-J. Elmers¹, and G. Schönhense¹ — ¹JGU Mainz, Germany — ²Université de Lorraine, Nancy, France — ³Synchrotron SOLEIL-CNRS, Gif-sur-Yvette, France — ⁴Universität Würzburg, Germany — ⁵DESY, Hamburg, Germany

The spin-resolved bulk electronic structure of the half-metallic ferromagnet Co₂MnSi was studied by HAXPES (beamline P22, PETRA III, Hamburg) using ToF k-microscopy [1], exploiting the large information depth of up to 20 nm. High-quality MBE films on MgO(100) were capped by 1 nm Au or 2 nm MgO; both showed clear Kikuchi-type photoelectron-diffraction patterns after transport under air. High-symmetry planes ΓKX and XUW were identified varying hν (3-5.3 keV). The photoemission intensities show clear band dispersion for both samples. The spin-resolved HAXPES data confirm that bulk Co₂MnSi is a half-metallic ferromagnet with the top of the minority band at the Γ-point, in accordance with theory [2]. Comparison with measurements on uncapped films at hν=30 eV [3] and 6 eV [4] allows to disentangle bulk and surface states.

[1] K. Medjanik et al., J. Synchr. Rad. 26, 1886 (2019); [2] http://heusleralloys.mint.ua.edu; [3] C. Guillemard et al., Phys. Rev. Appl. 11, 064009 (2019); [4] S. Chernov et al., arXiv 1910.05205 (2019)