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Probing and imaging spin interactions with a magnetic single-molecule sensor

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Science  17 May 2019:
Vol. 364, Issue 6441, pp. 670-673
DOI: 10.1126/science.aaw7505

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Visualizing superexchange interactions

The resolution that can be achieved in scanning probe microscopy can be greatly enhanced by absorbing a molecule such as CO on the probe tip. Czap et al. now show that this approach can be used to scan spin and magnetic properties of molecules on a surface. They adsorbed a magnetic molecule, Ni(cyclopentadienyl)2, on a silver surface and then transferred one of these molecules to a scanning tunnel microscope tip. They could then bring the tip toward the adsorbate-covered surface and map out the strength of superexchange interactions.

Science, this issue p. 670