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Coherent control of individual atomic and molecular spins on surfaces hasrecently been demonstrated by using electron spin resonance (ESR) in a scanningtunneling microscope (STM). Here we present a combined experimental andmodeling study of the ESR of a single hydrogenated Ti atom that isexchange-coupled to a Fe adatom located in 0.6-0.8 nm away. Continuous wave andpulsed ESR of the Ti spin showed a Rabi rate with two contributions, one fromthe tip and the other from the Fe, whose spin interactions with Ti weremodulated by the radio-frequency electric field. The Fe contribution iscomparable to the tip, as revealed from its dominance when the tip wasretracted, and tunable using a vector magnetic field. Our new ESR scheme allowson-surface individual spins to be addressed and coherently controlled withoutthe need for magnetic interaction with a tip. This study establishes a feasibleimplementation of spin-based multi-qubit systems on surfaces.

Electric-field-driven spin resonance by on-surface exchange coupling to a single-atom magnet