Spin Resonance Amplitude and Frequency of a Single Atom on a Surface in a Vector Magnetic Field

Abstract

We used electron spin resonance (ESR) combined with scanning tunneling microscopy (STM) to measure hydrogenated Ti (spin-1/2) atoms at low-symmetry binding sites on MgO in vector magnetic fields. We found strongly anisotropic g-values in all three spatial directions. Interestingly, the amplitude and lineshape of the ESR signals are also strongly dependent on the angle of the field. We conclude that the Ti spin is aligned along the magnetic field, while the tip spin follows its strong magnetic anisotropy. Our results show the interplay between the tip and surface spins in determining the ESR signals and highlight the precision of ESR-STM to identify the single atom's spin states.

References in corpus (21)

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• Quantum sensing
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• Derivation of the spin Hamiltonians for Fe in MgO
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Cited by in corpus (6)

• Atomic Manipulation of In-gap States on the $\beta$-Bi${}_2$Pd Superconductor
• Anisotropic hyperfine interaction of surface-adsorbed single atoms
• A study of all-electric electron spin resonance using Floquet quantum master equations
• Trends in the hyperfine interactions of magnetic adatoms on thin insulating layers
• Hamiltonian inference from dynamical excitations in confined quantum magnets
• Optimizing tip-surface interactions in ESR-STM experiments