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Precise control of the resonant frequency of a spin qubit is of fundamentalimportance to quantum sensing protocols. We demonstrate a control technique ona single nitrogen-vacancy (NV) centre in diamond where the applied magneticfield is modified by fine-tuning a permanent magnet's magnetisation viatemperature control. Through this control mechanism, nanoscale cross-relaxationspectroscopy of both electron and nuclear spins in the vicinity of the NVcentre are performed. We then show that through maintaining the magnet at aconstant temperature an order of magnitude improvement in the stability of theNV qubit frequency can be achieved. This improved stability is tested in thepolarisation of a small ensemble of nearby $^{13}$C spins via resonantcross-relaxation and the lifetime of this polarisation explored. Theeffectiveness and relative simplicity of this technique may find use in therealisation of portable spectroscopy and/or hyperpolarisation systems.

High precision single qubit tuning via thermo-magnetic field control