The magneto-thermoelectric properties of Heusler compound thin films are very diverse. Here, we discuss the anomalous Nernst response of Co2MnGa thin films. We systematically study the anomalous Nernst coefficient as a function of temperature, and we show that unlike the anomalous Hall effect, the anomalous Nernst effect in Co2MnGa strongly varies with temperature. We exploit the on-chip thermometry technique to quantify the thermal gradient, which enables us to directly evaluate the anomalous Nernst coefficient. We compare these results to a reference CoFeB thin film. We show that the 50-nm-thick Co2MnGa films exhibit a large anomalous Nernst effect of −2 μV/K at 300 K, whereas the 10-nm-thick Co2MnGa film exhibits a significantly smaller anomalous Nernst coefficient despite having similar volume magnetizations. These findings suggest that the microscopic origin of the anomalous Nernst effect in Co2MnGa is complex and may contain contributions from skew-scattering, side-jump, or intrinsic Berry phase. In any case, the observed anomalous Nernst coefficient of −2 μV/K at 300 K is large compared to the values measured in other thin films and makes this material system a very promising candidate for efficient spin-caloritronic devices.
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19 November 2018
Research Article|
November 20 2018
Large anomalous Nernst effect in thin films of the Weyl semimetal Co2MnGa
Helena Reichlova;
Helena Reichlova
a)
1
Institut für Festkörper-und Materialphysik, Technische Universität Dresden
, 01062 Dresden, Germany
2
Institute of Physics ASCR
, v.v.i., 162 53 Praha, Czech Republic
a)Author to whom correspondence should be addressed: helena.reichlova@tu-dresden.de.
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Richard Schlitz;
Richard Schlitz
1
Institut für Festkörper-und Materialphysik, Technische Universität Dresden
, 01062 Dresden, Germany
3
Center for Transport and Devices of Emergent Materials, Technische Universität Dresden
, 01062 Dresden, Germany
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Sebastian Beckert;
Sebastian Beckert
1
Institut für Festkörper-und Materialphysik, Technische Universität Dresden
, 01062 Dresden, Germany
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Peter Swekis;
Peter Swekis
1
Institut für Festkörper-und Materialphysik, Technische Universität Dresden
, 01062 Dresden, Germany
4
Max Planck Institute for Chemical Physics of Solids
, 01187 Dresden, Germany
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Anastasios Markou;
Anastasios Markou
4
Max Planck Institute for Chemical Physics of Solids
, 01187 Dresden, Germany
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Yi-Cheng Chen;
Yi-Cheng Chen
4
Max Planck Institute for Chemical Physics of Solids
, 01187 Dresden, Germany
5
Department of Materials Science and Engineering, National Chiao Tung University
, Hsinchu City 30010, Taiwan
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Dominik Kriegner;
Dominik Kriegner
4
Max Planck Institute for Chemical Physics of Solids
, 01187 Dresden, Germany
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Savio Fabretti;
Savio Fabretti
1
Institut für Festkörper-und Materialphysik, Technische Universität Dresden
, 01062 Dresden, Germany
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Gyu Hyeon Park;
Gyu Hyeon Park
6
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials
, 01069 Dresden, Germany
7
Technische Universität Dresden, Institute of Materials Science
, 01062 Dresden, Germany
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Anna Niemann;
Anna Niemann
6
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials
, 01069 Dresden, Germany
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Shashank Sudheendra;
Shashank Sudheendra
6
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials
, 01069 Dresden, Germany
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Andy Thomas;
Andy Thomas
3
Center for Transport and Devices of Emergent Materials, Technische Universität Dresden
, 01062 Dresden, Germany
6
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials
, 01069 Dresden, Germany
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Kornelius Nielsch
;
Kornelius Nielsch
6
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Institute for Metallic Materials
, 01069 Dresden, Germany
7
Technische Universität Dresden, Institute of Materials Science
, 01062 Dresden, Germany
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Claudia Felser;
Claudia Felser
4
Max Planck Institute for Chemical Physics of Solids
, 01187 Dresden, Germany
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Sebastian T. B. Goennenwein
Sebastian T. B. Goennenwein
1
Institut für Festkörper-und Materialphysik, Technische Universität Dresden
, 01062 Dresden, Germany
3
Center for Transport and Devices of Emergent Materials, Technische Universität Dresden
, 01062 Dresden, Germany
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a)Author to whom correspondence should be addressed: helena.reichlova@tu-dresden.de.
Appl. Phys. Lett. 113, 212405 (2018)
Article history
Received:
July 17 2018
Accepted:
October 23 2018
Citation
Helena Reichlova, Richard Schlitz, Sebastian Beckert, Peter Swekis, Anastasios Markou, Yi-Cheng Chen, Dominik Kriegner, Savio Fabretti, Gyu Hyeon Park, Anna Niemann, Shashank Sudheendra, Andy Thomas, Kornelius Nielsch, Claudia Felser, Sebastian T. B. Goennenwein; Large anomalous Nernst effect in thin films of the Weyl semimetal Co2MnGa. Appl. Phys. Lett. 19 November 2018; 113 (21): 212405. https://doi.org/10.1063/1.5048690
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