Thermospin effects in ferromagnetic graphene mesoscopic device are investigated. The thermo-spin characteristics such as spin Seebeck coefficient, the thermal conductance, and spin figure of merit are expressed in terms of the tunneling
probability of Dirac fermions for both parallel and antiparallel spin alignments of electrons. This tunneling probability and
the corresponding electrical conductance are derived by solving Dirac equation for both spin alignments. Numerical
calculations are performed and the obtained results show that the values of Seebeck coefficient, thermal conductance, and
figure of merit are different for spin up and spin down. Their values are increased as the frequency of the induced ac-field
increases, that is, the thermospin transport through such device is enhanced by the photon energy. The present research is very important in the field of spin caloritronics on the nanoscale systems. |
