  The rising field of spin caloritronics focuses on the interactions between
spin and heat currents in a magnetic material; the observation of the spin
Seebeck effect opened the route to this branch of research. This paper reports
the results of a round robin test performed by five partners on a single device
highlighting the reproducibility problems related to the measurements of the
spin Seebeck coefficient, the quantity that describes the strength of the spin
Seebeck effect. This work stimulated the search for more reproducible
measurement methods through the analysis of the systematic effects.
