Combining the sub-atomic resolution of a scanning tunneling microscope (STM) with the spectral resolution of electron-paramagnetic resonance (EPR) allows for probing magnetic interactions of single atoms on a surface with unprecedented sensitivity. Here, the authors use an RF antenna close to the tunnel junction of the STM to drive efficiently EPR of hydrogenated Ti atoms at temperatures of up to 5 K.
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Seifert et al. (2020) studied this question.
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