  This study focuses on the potential of permanent magnets as thermoelectric
converters. It is found that a SmCo$_5$-type magnet exhibits the large
anomalous Ettingshausen effect (AEE) at room temperature and that its
charge-to-heat current conversion coefficient is more than one order of
magnitude greater than that of typical ferromagnetic metals. The large AEE is
an exclusive feature of the SmCo$_5$-type magnet among various permanent
magnets in practical use, which is independent of the conventional performance
of magnets based on static magnetic properties. The experimental results show
that the large AEE originates from the intrinsic transverse thermoelectric
conductivity of SmCo$_5$. This finding makes a connection between permanent
magnets and thermal energy engineering, providing the basis for creating
"thermoelectric permanent magnets."
