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

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.

Automated summary

In this study, we investigated the magnetic properties and anomalous Nernst effect in a NiFe/Cr/NiFe trilayer both theoretically and experimentally. We found that the system exhibits a biphasic magnetic behavior, which can be attributed to the distinct structural properties of the top and bottom magnetic layers. Our results showed that the thermomagnetic response strongly depends on the anisotropies and magnetic response of the biphasic system, and the thermomagnetic results are more sensitive to the anisotropies compared to the magnetometry ones. Furthermore, we found that the anomalous Nernst coefficient in our trilayer is comparable to those observed in high-efficient thermomagnetic systems, and is enhanced compared to single layers. Additionally, our findings reveal the different contributions of the top and bottom layers to the thermomagnetic signal due to the presence of the Cr spacer in the trilayer system.