Journal
NANO LETTERS
Volume 20, Issue 11, Pages 8193-8199Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03271
Keywords
scanning tunneling microscopy; Kondo effect; metallocene; molecular tip; magnetic sensor
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Funding
- Agence Nationale de la Recherche [ANR-13-BS10-0016, ANR-11-LABX-0058 NIE, ANR-10-LABX-0026 CSC]
- MICINN [RTI2018-097895-B-C44]
- Agence Nationale de la Recherche (ANR) [ANR-13-BS10-0016] Funding Source: Agence Nationale de la Recherche (ANR)
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A single molecule offers to tailor and control the probing capability of a scanning tunneling microscope when placed on the tip. With the help of first-principles calculations, we show that on-tip spin sensitivity is possible through the Kondo ground state of a spin S = 1/2 cobaltocene molecule. When attached to the tip apex, we observe a reproducible Kondo resonance, which splits apart upon tuning the exchange coupling of cobaltocene to an iron atom on the surface. The spin-split Kondo resonance provides quantitative information on the exchange field and on the spin polarization of the iron atom. We also demonstrate that molecular vibrations cause the emergence of Kondo side peaks, which, unlike the Kondo resonance, are sensitive to cobaltocene adsorption.
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