Studies of magnetic dipolar interaction between individual atoms using ESR-STM

Taeyoung Choi, Christopher P. Lutz, Andreas J. Heinrich

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Sensing magnetic interactions at the atomic scale and utilizing those interactions for magnetometry have been highly challenging and important topics in the magnetic resonance community. Recently, electron spin resonance and scanning tunneling microscopy (ESR-STM) have been successfully combined, enabling spin resonance of individual atoms on ultrathin insulating MgO surfaces. When two magnetic atoms are positioned within the separation range of 1 nm–4 nm, two spectral features appear in the ESR measurement. The difference in those two frequencies follows a r−3 distance-dependence, indicating that the individual atoms are coupled through the magnetic dipolar interaction. Here, we discuss the spin relaxation times that lead to the observed ESR spectra. In addition, we suggest a quantum Hamiltonian model to obtain further insights toward, for example, studies of frustrated spin systems.

Original languageEnglish
Pages (from-to)1513-1517
Number of pages5
JournalCurrent Applied Physics
Issue number11
StatePublished - Nov 2017

Bibliographical note

Funding Information:
The authors thank B. Melior for expert technical assistance. T.C. and A.H. acknowledge support from Ewha Womans University and Institute for Basic Science, Republic of Korea (this work was supported by IBS-R027-D1 ). C.L. gratefully acknowledges financial support from the Office of Naval Research and IBM .

Publisher Copyright:
© 2017 Elsevier B.V.


  • ESR
  • Magnetic dipolar interaction
  • Magnetometry
  • STM


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