  We present a stochastic thermodynamics analysis of an electron-spin-resonance
pumped quantum dot device in the Coulomb-blocked regime, where a pure spin
current is generated without an accompanying net charge current. Based on a
generalized quantum master equation beyond secular approximation, quantum
coherences are accounted for in terms of an effective average spin in the
Floquet basis. Elegantly, this effective spin undergoes a precession about an
effective magnetic field, which originates from the non-secular treatment and
energy renormalization. It is shown that the interaction between effective spin
and effective magnetic field may have the dominant roles to play in both energy
transport and irreversible entropy production. In the stationary limit, the
energy and entropy balance relations are also established based on the theory
of counting statistics.
