This work was supported by the Spanish Ministry of Science (through Projects No. PRI-PIBJP-2011-0794 and No. MAT2011-27553-C02, including FEDER funding), the Aragon Regional Government (Project No. E26), and Thermo-Spintronic Marie Curie CIG (Grant Agreement No. 304043). This research was also supported by Strategic International Cooperative Program, Japan Science and Technology Agency (JST), PRESTO-JST “Phase Interfaces for Highly Efficient Energy Utilization,” CREST-JST “Creation of Nanosystems with Novel Functions through Process Integration,” a Grantin-Aid for Young Scientists (A) (No. 25707029) from MEXT, Japan, a Grant-in-Aid for Scientific Research (A) (No. 24244051) from MEXT, Japan, LC-IMR of Tohoku University, the Tanikawa Fund Promotion of Thermal Technology, and Casio Science Promotion Foundation.

We report a complete characterization of the anomalous Nernst effect (ANE) and its relationship with the anomalous Hall effect (AHE) in Fe3⁢O4. By combining full thermoelectric and electric transport measurements as a function of temperature, we have verified that the universal scaling relation between the anomalous Hall and diagonal conductivities (𝜎𝑧⁢𝑦∝𝜎1.6𝑧⁢𝑧), observed in materials with bad-metal-hopping type of conduction, is also applicable to the thermoelectric transport. We further show that the ANE and AHE are commonly related through the Mott relation, therefore demonstrating its validity for anomalous transport phenomena in materials with conduction in the the dirty regime.

Peer reviewed