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Exchange forces on the movable dot ("shuttle") in a magnetic shuttle devicedepend on the parity of the number of shuttling electrons. The performance ofsuch a device can therefore be tuned by changing the strength $U$ of Coulombcorrelations to block or unblock parity fluctuations. We show that byincreasing $U$ the spintro-mechanics of the device crosses over, at $U=U_c(T)$,from a mechanically stable regime to a regime of spin-induced shuttleinstabilities. This is due to enhanced spin-dependent mechanical forces asparity fluctuations are reduced by a Coulomb blockade of tunneling anddemonstrates that single-electron manipulation of single-spin controllednano-mechanics is possible.

Coulomb-promoted spintromechanics in magnetic shuttle devices