  A perspective magneto-thermo-electric cooling device (MTECD) comprising a
central magnetocaloric (MC) material (e.g., Gd) sandwiched by two
thermoelectric (TE) materials (e.g., MnP) is proposed. The presence of the TE
materials in the MTECD guides the heat flow direction and enhances heat
pulsation. In this case, the usage of a ferromagnetic TE material that combines
large TE with small MC properties within a similar temperature region can
enhance the magnetic flux density and heat exchange efficiency. Here, we show
that MnP nanorod-structured films with desired magnetic, MC and TE properties
are very promising for use in MTECDs. The films were grown on Si substrates at
300, 400 and 500{\deg}C using molecular beam epitaxy. The 400 oC sample shows a
desired TE and MC combination. A large power factor of 24.06 {\mu}W m-1 K-2 is
achieved at room temperature. In this temperature region, the film exhibits a
small MC effect (-deltaSM ~0.64 J/kg K and deltaTad ~0.3 K at m0H = 2 T) but
ferromagnetism that gives rise to the enhanced MC effect of the central MC
material. These properties could enable the MTECD to operate at high frequency.
