Anomalous Nernst effect in Co2MnGa thin films with perpendicular magnetic anisotropy

• Published in: Journal of magnetism and magnetic materials Vol. 500; p. 166397
• Main Authors: Hu, Junfeng, Zhang, Yao, Cabero Z., Marco A., Wei, Bohang, Tu, Sa, Liu, Song, Yu, Dapeng, Ansermet, Jean-Philippe, Granville, Simon, Yu, Haiming
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.04.2020; Elsevier BV
• Subjects: Anomalous Nernst effect; Heusler thin film; Magnetic anisotropy; Magnetic properties; Nernst-Ettingshausen effect; Perpendicular magnetic anisotropy; Remanence; Room temperature; Spintronics; Thermoelectric applications; Thickness; Thin films; Transport properties; Heusler thin film; Perpendicular magnetic anisotropy; Thermoelectric applications; Anomalous Nernst effect; Spintronics
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2020.166397

•Thin film stacks of MgO/Co2MnGa/Pd have perpendicular magnetic anisotropy.•Anomalous Nernst effect was measured and large anomalous Nernst angle found: 5–6.5%.•Anomalous Nernst and Hall effects exhibit nonlinear temperature dependence.•Anomalous Nernst angle can be tuned by changing the layer thicknesses. The thermoelectric and transport properties of MgO/Co2MnGa/Pd stacks with perpendicular magnetic anisotropy were measured. For a nominal 3.3 nm Co2MnGa thickness, the anomalous Nernst coefficient and the Nernst angle at room temperature were found to be 0.3±0.05 μV/K and 5±1%, respectively. The Nernst and Hall angle temperature dependences show similar trends. Increasing the Co2MnGa thickness to 3.6 nm enhances the anomalous Nernst angle to 6.5% at room temperature. At remanence, the anomalous Nernst coefficient at room temperature is half the saturation value.