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Atomic-scale sensing of the magnetic dipolar field from single atoms

Title
Atomic-scale sensing of the magnetic dipolar field from single atoms
Authors
Choi, TaeyoungPaul, WilliamRolf-Pissarczyk, SteffenMacdonald, Andrew J.Natterer, Fabian D.Yang, KaiWillke, PhilipLutz, Christopher P.Heinrich, Andreas J.
Ewha Authors
Andreas Heinrich최태영
Issue Date
2017
Journal Title
NATURE NANOTECHNOLOGY
ISSN
1748-3387JCR Link1748-3395JCR Link
Citation
vol. 12, no. 5, pp. 420 - 424
Publisher
NATURE PUBLISHING GROUP
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Spin resonance provides the high-energy resolution needed to determine biological and material structures by sensing weak magnetic interactions(1). In recent years, there have been notable achievements in detecting(2) and coherently controlling(3-7) individual atomic-scale spin centres for sensitive local magnetometry(8-10). However, positioning the spin sensor and characterizing spin-spin interactions with sub-nanometre precision have remained outstanding challenges(11,12). Here, we use individual Fe atoms as an electron spin resonance (ESR) sensor in a scanning tunnelling microscope to measure the magnetic field emanating from nearby spins with atomic-scale precision. On artificially built assemblies of magnetic atoms (Fe and Co) on a magnesium oxide surface, we measure that the interaction energy between the ESR sensor and an adatom shows an inverse-cube distance dependence (r(-3.01+/-0.04)). This demonstrates that the atoms are predominantly coupled by the magnetic dipole-dipole interaction, which, according to our observations, dominates for atom separations greater than 1 nm. This dipolar sensor can determine the magnetic moments of individual adatoms with high accuracy. The achieved atomic-scale spatial resolution in remote sensing of spins may ultimately allow the structural imaging of individual magnetic molecules, nanostructures and spin-labelled biomolecules.
DOI
10.1038/NNANO.2017.18
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자연과학대학 > 물리학전공 > Journal papers
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