  In this contribution, we investigate two coupled spins as a working substance
of the quantum Stirling heat engine cycle. We propose an experimentally
implementable scheme in which the cycle is driven by tuning the dipole-dipole
interaction angle via dynamic-angle spinning technique in a fixed magnetic
field. Realistic parameters are chosen for the proposed heat engine cycle. In
addition, we aim to estimate power of the engine. To accomplish this, we focus
on the microdynamics of the quantum isothermal process to predict required-time
per engine cycle. The results obtained indicate that the engine produces work
with high efficiency. Furthermore, the engine reaches maximum power at same
point where the maximum efficiency is satisfied.
