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Magnetic and electronic properties of weyl semimetal Co2MnGa thin films

MPS-Authors
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Swekis,  Peter
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sukhanov,  Alexandr S.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Chen,  Yi-Cheng
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fecher,  Gerhard H.
Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sichelschmidt,  Jörg
Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Markou,  Anastasios
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Swekis, P., Sukhanov, A. S., Chen, Y.-C., Gloskovskii, A., Fecher, G. H., Panagiotopoulos, I., et al. (2021). Magnetic and electronic properties of weyl semimetal Co2MnGa thin films. Nanomaterials, 11(1): 251, pp. 1-14. doi:10.3390/nano11010251.


Cite as: http://hdl.handle.net/21.11116/0000-0007-E4B6-A
Abstract
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. Fur-ther, 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. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.