Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 29: Caloric Effects in Magnetic Materials
MA 29.4: Talk
Thursday, September 8, 2022, 10:15–10:30, H47
Anomalous Nernst effect in ferromagnetic τ-MnAl thin films — •Daniel Scheffler1, Helena Reichlova1, Sebastian Beckert1, Torsten Mix2, Thomas G. Woodcock2, Sebastian T. B. Goennenwein3, and Andy Thomas1,2 — 1Technische Universität Dresden — 2Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden) — 3University of Konstanz
τ-MnAl is a ferromagnetic compound with high uniaxial magnetocrystalline anisotropy. In single crystalline films, the anomalous Hall effect and the tunnel magnetoresistance effect have been investigated, the magneto-thermal transport properties of τ-MnAl films are unknown. Given the unique anisotropy, this material could allow for a robust spontaneous anomalous Nernst effect generated by a thermal gradient applied in the film plane.
We have sucessfully grown single crystalline τ-MnAl thin films via co-sputtering. X-ray diffraction and DC magnetometry confirm a good structural quality and strong perpendicular magnetic anisotropy. We observe a robust anomalous Hall effect with a coercivity of 1 T in magneto-transport measurements. In the same device, a defined thermal gradient can also be applied in the sample plane, resulting in a clear anomalous Nernst effect response.
We will present results from our magneto-transport and magneto-thermopower experiments, which in particular allow to quantify the anomalous Nernst effect coefficient. Our results show that τ-MnAl in thin film form is an interesting material for spin-caloritronic research and devices.