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

Yishay Manassen, Moamen Jbara, Michael Averbukh, Zion Hazan, Carsten Henkel, Baruch Horovitz

Research output: Contribution to journalArticlepeer-review

Abstract

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

Original languageEnglish
Article number235438
JournalPhysical Review B
Volume105
Issue number23
DOIs
StatePublished - 15 Jun 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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