Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 29: Caloric Effects in Magnetic Materials

MA 29.4: Vortrag

Donnerstag, 8. September 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 Thomas^1,2 — 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.