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Open AccessArticle

Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

1
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
2
Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
3
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
4
Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
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Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece
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Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland
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Institut Laue Langevin, 38000 Grenoble, France
8
Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
9
Center for Transport and Devices of Emergent Materials, Technische Universität Dresden, 01062 Dresden, Germany
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Department of Physics, University of Konstanz, 78457 Konstanz, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2021, 11(1), 251; https://doi.org/10.3390/nano11010251
Received: 21 December 2020 / Revised: 12 January 2021 / Accepted: 14 January 2021 / Published: 19 January 2021
(This article belongs to the Special Issue Synthesis, Development and Characterization of Magnetic Nanomaterials)
Magnetic Weyl semimetals are newly discovered quantum materials with the potential for use in spintronic applications. Of particular interest is the cubic Heusler compound Co2MnGa due to its inherent magnetic and topological properties. This work presents the structural, magnetic and electronic properties of magnetron co-sputtered Co2MnGa thin films, with thicknesses ranging from 10 to 80 nm. Polarized neutron reflectometry confirmed a uniform magnetization through the films. Hard x-ray photoelectron spectroscopy revealed a high degree of spin polarization and localized (itinerant) character of the Mn d (Co d) valence electrons and accompanying magnetic moments. Further, broadband and field orientation-dependent ferromagnetic resonance measurements indicated a relation between the thickness-dependent structural and magnetic properties. The increase of the tensile strain-induced tetragonal distortion in the thinner films was reflected in an increase of the cubic anisotropy term and a decrease of the perpendicular uniaxial term. The lattice distortion led to a reduction of the Gilbert damping parameter and the thickness-dependent film quality affected the inhomogeneous linewidth broadening. These experimental findings will enrich the understanding of the electronic and magnetic properties of magnetic Weyl semimetal thin films. View Full-Text
Keywords: topological materials; magnetic Weyl semimetals; Heusler compounds; magnetic dichroism; photoelectron spectroscopy; ferromagnetic resonance; polarized neutron reflectivity; thin films; magnetic anisotropy topological materials; magnetic Weyl semimetals; Heusler compounds; magnetic dichroism; photoelectron spectroscopy; ferromagnetic resonance; polarized neutron reflectivity; thin films; magnetic anisotropy
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MDPI and ACS Style

Swekis, P.; Sukhanov, A.S.; Chen, Y.-C.; Gloskovskii, A.; Fecher, G.H.; Panagiotopoulos, I.; Sichelschmidt, J.; Ukleev, V.; Devishvili, A.; Vorobiev, A.; Inosov, D.S.; Goennenwein, S.T.B.; Felser, C.; Markou, A. Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films. Nanomaterials 2021, 11, 251. https://doi.org/10.3390/nano11010251

AMA Style

Swekis P, Sukhanov AS, Chen Y-C, Gloskovskii A, Fecher GH, Panagiotopoulos I, Sichelschmidt J, Ukleev V, Devishvili A, Vorobiev A, Inosov DS, Goennenwein STB, Felser C, Markou A. Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films. Nanomaterials. 2021; 11(1):251. https://doi.org/10.3390/nano11010251

Chicago/Turabian Style

Swekis, Peter; Sukhanov, Aleksandr S.; Chen, Yi-Cheng; Gloskovskii, Andrei; Fecher, Gerhard H.; Panagiotopoulos, Ioannis; Sichelschmidt, Jörg; Ukleev, Victor; Devishvili, Anton; Vorobiev, Alexei; Inosov, Dmytro S.; Goennenwein, Sebastian T.B.; Felser, Claudia; Markou, Anastasios. 2021. "Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films" Nanomaterials 11, no. 1: 251. https://doi.org/10.3390/nano11010251

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