Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

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2021
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Swekis, Peter
Sukhanov, Aleksandr S.
Chen, Yi-Cheng
Gloskovskii, Andrei
Fecher, Gerhard H.
Panagiotopoulos, Ioannis
Sichelschmidt, Jörg
Ukleev, Victor
Markou, Anastasios
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urn:nbn:de:bsz:352-2-16k9sjhe6wia18
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10.3390/nano11010251
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Nanomaterials ; 11 (2021), 1. - 251. - MDPI. - eISSN 2079-4991
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. 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.
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530 Physics
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topological materials; magnetic Weyl semimetals; Heusler compounds; magnetic dichroism; photoelectron spectroscopy; ferromagnetic resonance; polarized neutron reflectivity; thin films; magnetic anisotropy
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ISO 690SWEKIS, Peter, Aleksandr S. SUKHANOV, Yi-Cheng CHEN, Andrei GLOSKOVSKII, Gerhard H. FECHER, Ioannis PANAGIOTOPOULOS, Jörg SICHELSCHMIDT, Victor UKLEEV, Sebastian T. B. GÖNNENWEIN, Anastasios MARKOU, 2021. Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films. In: Nanomaterials. MDPI. 11(1), 251. eISSN 2079-4991. Available under: doi: 10.3390/nano11010251
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@article{Swekis2021-01-19Magne-53539,
  year={2021},
  doi={10.3390/nano11010251},
  title={Magnetic and Electronic Properties of Weyl Semimetal Co<sub>2</sub>MnGa Thin Films},
  number={1},
  volume={11},
  journal={Nanomaterials},
  author={Swekis, Peter and Sukhanov, Aleksandr S. and Chen, Yi-Cheng and Gloskovskii, Andrei and Fecher, Gerhard H. and Panagiotopoulos, Ioannis and Sichelschmidt, Jörg and Ukleev, Victor and Gönnenwein, Sebastian T. B. and Markou, Anastasios},
  note={Article Number: 251}
}
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