The implementation of electron spin resonance in scanning tunneling microscopy (ESR-STM) represented a milestone in controlling spin systems at atomic scales. To drive spin resonance, a radio-frequency (RF) magnetic field is required. Yet, so far, in ESR-STM, instead of an RF magnetic field an RF electric field has been used for driving, which translates into an effective RF magnetic field. For cases in which such a field-conversion mechanism is not feasible, we developed an implementation of a low-GHz RF magnetic field in a scanning-probe setup. To this end, we utilized a single-loop coil based on a flexible polyimide printed-circuit-board to generate the RF magnetic field. To locally enhance the RF magnetic field in the scanning-probe junction, we used a gold-microstrip on an insulating support as a sample surface. We found that up to 3 GHz, the transmission only moderately depends on frequency and exhibits no sharp resonances. This development enabled the implementation of ESR in atomic force microscopy, as was demonstrated for individual pentacene molecules.
Spachtholz et al. (Mon,) studied this question.
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