The correlation between spin and charge in electronic transports has been energetically studied in a scheme of spintronics research. Recently, the coupling between heat current, spin current and charge current is also attracting much attention, and this newly established field is called “spin caloritronics”. The recent discovery of the spin Seebeck effect, i.e., the generation of spin current from a temperature gradient, has explosively expanded this field, and a number of thermomagnetic effects related to spin current have been investigated. On the other hand, the Nernst effect is a common thermomagnetic effect, which has been known for a long time. When a temperature gradient is applied on a material with spontaneous magnetization, an electric field is induced in the perpendicular direction to both the temperature gradient and the magnetization, which is called the anomalous Nernst effect (ANE). In previous papers, we reported ANE measurements of an L10-ordered epitaxial FePt thin film for studying thermomagnetic effects in ordered alloys, and we also investigated the material dependence of ANE in several perpendicularly magnetized ordered-alloy thin films. Obtaining materials with a large ANE is indispensable to realize a practical application of ANE-based energy conversion. From this point of view, this paper describes our study on the correlation between magnetic anisotropy and the ANE in various materials. The enhancement effect of ANE with spin-wave spin currents in nanostructures will be also discussed with theoretical viewpoints.
Prof. Masaki Mizuguchi is an associate professor in Institute for Materials Research, Tohoku University in Japan. He graduated from the University of Tokyo, and obtained a Ph.D. degree in 2003. After being an assistant professor at Osaka University, he obtained the present position in 2009. His major research fields are magnetic thin films, nano-devices, and spintronics. He has published more than 150 original papers in journals, books and conference proceedings.