Theoretical and experimental study of anomalous Nernst effect in biphasic magnetic system

Abstract

We perform a theoretical and experimental investigation of magnetic properties and anomalous Nernst effect in a NiFe/Cr/NiFe trilayer. Our system presents a biphasic magnetic behavior, a response owed to distinct structural properties of the bottom and top magnetic layers. We verify the thermomagnetic results strongly depend on the anisotropies and magnetic response of the biphasic system. Moreover, the thermomagnetic results seem to be much more sensitive to the anisotropies than the magnetometry ones. We show the anomalous Nernst coefficient found in our trilayer is quite comparable with those verified for high-efficient thermomagnetic systems. We also disclose an enhancement if compared with the ones observed for single layers. Beyond, our results highlight the role of each ferromagnetic layer on the thermomagnetic response. Our experimental and theoretical findings show that the top and bottom layers contribute differently to the thermomagnetic signal due to the Cr spacer in the trilayer system.