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Spin resonance amplitude and frequency of a single atom on a surface in a vector magnetic field

Jinkyung Kim, Won-jun Jang, Thi Hong Bui, Deung-Jang Choi, Christoph Wolf, Fernando Delgado, Yi Chen, Denis Krylov, Soonhyeong Lee, Sangwon Yoon, Christopher P. Lutz, Andreas J. Heinrich, and Yujeong Bae
Phys. Rev. B 104, 174408 – Published 8 November 2021
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Abstract

We investigated spin-1/2 hydrogenated titanium (Ti) atoms on MgO using scanning tunneling microscopy (STM) combined with electron spin resonance (ESR) in vector magnetic fields. Rotating external magnetic fields, we observed rather drastic changes in both amplitude and frequency of resonance signals for single Ti atoms. While the variation of ESR amplitudes reflects the effects of the spin polarization of a magnetic tip and local magnetic fields created by the interaction between the tip and Ti, the change of resonance frequencies shows the anisotropy of g values for Ti atoms. Using the Ti atoms at the low-symmetry bridge adsorption site of the MgO lattice allowed for identifying the g values in all three spatial directions. Multiplet calculations confirmed the origin of this anisotropy as the spin-orbit coupling induced effects of crystal. Our results show the capability of single atomic spins as a sensor to probe magnetic surroundings and highlight the precision of ESR-STM to identify the single atom's spin states in a solid-state environment.

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  • Received 30 March 2021
  • Revised 25 August 2021
  • Accepted 30 September 2021

DOI:https://doi.org/10.1103/PhysRevB.104.174408

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jinkyung Kim1,2,*, Won-jun Jang3,*, Thi Hong Bui1,2, Deung-Jang Choi4,5,6, Christoph Wolf1,7, Fernando Delgado8, Yi Chen1,7, Denis Krylov1,7, Soonhyeong Lee1,7, Sangwon Yoon1,7, Christopher P. Lutz9, Andreas J. Heinrich1,2,†, and Yujeong Bae1,2,‡

  • 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul 03760, South Korea
  • 2Department of Physics, Ewha Womans University, Seoul 03760, South Korea
  • 3Samsung Advanced Institute of Technology, Suwon 13595, South Korea
  • 4Centro de Física de Materiales–MPC (CSIC-UPV/EHU), 20018 San Sebastián, Spain
  • 5Donostia International Physics Center, 20018 Donostia, San Sebastian, Spain
  • 6Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
  • 7Ewha Womans University, Seoul 03760, Republic of Korea
  • 8Instituto de Estudios Avanzados IUDEA, Departamento de Fisica, Universidad de La Laguna, 38203 Tenerife, Spain
  • 9IBM Almaden Research Center, San Jose, California 95120, USA

  • *These authors contributed equally to this work.
  • Corresponding author: heinrich.andreas@qns.science
  • Corresponding author: bae.yujeong@qns.science

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Issue

Vol. 104, Iss. 17 — 1 November 2021

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