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We suggest a new type of nano-electromechanical resonator, the functionalityof which is based on a magnetic field induced deflection of an appropriatecantilever that oscillates between nitrogen vacancy (NV) spins in daimond.Specifically, we consider a Si(100) cantilever coated with a thin magnetic Nifilm. Magnetoelastic stress and magnetic-field induced torque are utilized toinduce a controlled cantilever deflection. It is shown that, depending on thevalue of the system parameters, the induced asymmetry of the cantileverdeflection substantially modifies the characteristics of the system. Inparticular, the coupling strength between the NV spins and the degree ofentanglement can be controlled through magnetoelastic stress and magnetic-fieldinduced torque effects. Our theoretical proposal can be implementedexperimentally with the potential of increasing several times the couplingstrength between the NV spins as compared to the maximal coupling strengthreported before in P. Rabl, et al. Phys. Rev. B 79, 041302(R) (2009).

Entanglement between nitrogen vacancy spins in diamond controlled by a nanomechanical resonator