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O: Fachverband Oberflächenphysik

O 44: Mini-Symposium: Manipulation and control of spins on functional surfaces II

O 44.1: Hauptvortrag

Dienstag, 2. März 2021, 13:30–14:00, R2

Atomic-scale spin sensing with a single molecule at the apex of a STM — •Laurent Limot — Université de Strasbourg, CNRS, IPCMS, Strasbourg, France

The decoration of metal probe-tips by a molecule intentionally picked up from a surface has proven to be a powerful method to improve the measurement capabilities of a scanning tunneling microscope (STM). The degrees of freedom of the molecule introduce tip-surface interactions across the vacuum gap that are usually absent when using a metallic apex. These interactions can endow STM with an enhanced sub-molecular resolution and provide new chemical insight.

The success of this approach opens the prospect of introducing spin sensitivity through the tip functionalization by a magnetic molecule. We show here that it is possible to use metallocene-terminated tips to monitor surface magnetism through the inelastic component of the tunneling current, which provides an electrical access to the metallocene spin states. When the tip is 100 picometers away from point contact, the exchange interaction between the tip and a magnetic sample changes the metallocene spin states. This detection scheme can then be used to simultaneously probe the sample exchange field and spin polarization with atomic-scale resolution.