  Graphene is a very promising material in spintronics due to both its high
electric mobility and low intrinsic spin-obit coupling. Electronic spins can be
injected from a ferromagnetic material through a tunnel contact into graphene
owing to a spin relaxation length as high as 5{\mu}m. In recent years, a new
approach creating spin current employed thermal effects and heat flow. Here, by
applying transverse and longitudinal current to a grahene spin valve device,
the interplay between the heat spin current and the charge spin current is
investigated. The non-local spin voltage is enhanced by the thermal spin
injection and the thermal spin voltage reaches a maximum close to the Dirac
point which makes graphene a promising material for a future thermoelectric
spin device due to its long spin lifetime and spin diffusion length.
