  We construct an entangled quantum Otto engine based on spin-1/2 systems
undergoing Dzyaloshinski-Moriya (DM) interaction within a varying magnetic
field. We investigate the influence of the DM interaction on basic
thermodynamic quantities, including heat transfer, work done, and efficiency
and find that the DM interaction importantly influences the engine's
thermodynamics. We obtain an expression for engine efficiency, finding it to
yield the same efficiency for antiferromagnetic and ferromagnetic coupling. A
new upper bound, nontrivially consistent with the second law of thermodynamics,
is derived for engine efficiency in the case of non-zero DM interaction.
