Tunnel current noise spectra of spins in individual dimers of molecular radicals

We report the detection of electron spin resonance (ESR) in individual dimers stable free radical 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO). ESR is measured by current fluctuations a scanning tunneling microscope (ESR-STM method). The multipeak power spectra, distinct from macroscopic data, are assigned to having exchange and Dzyaloshinskii-Moriya interactions presence spin-orbit coupling. These generated our model interfering electronic pathways tip sample via dimer's two molecules. This first demonstration that spins valid mechanism ESR-STM method.