Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies IV
O 43.6: Vortrag
Mittwoch, 20. März 2024, 11:45–12:00, MA 004
Magnetic resonance imaging of an electron spin residing in an extended molecular orbital — •Richard Schlitz1,2, Stepan Kovarik1, Aishwarya Vishwakarma1, Dominic Ruckert1, Pietro Gambardella1, and Sebastian Stepanow1 — 1Department of Materials, ETH Zürich, 8093 Zürich, Switzerland — 2Department of Physics, University of Konstanz, 78457 Konstanz, Germany
The combination of a scanning tunneling microscopy (STM) and electron paramagnetic resonance (EPR) allows addressing individual spins on surfaces with sub-µeV energy resolution and pm spatial resolution. Recent works demonstrated that EPR-STM can be used for magnetic resonance imaging (MRI), which reveals the interaction between the magnetic STM tip and the investigated spin species [1]. However, until now imaging was only performed for spins that were localized in an atomic orbital. In this talk, we will show the MRI of pentacene on two monolayers of MgO on Ag(001) by EPR-STM. Pentacene on MgO is singly charge with the electron residing in a delocalized molecular orbital. We discuss how the resonant slice is modified by the extended nature of the electron orbital and critically highlight differences to the atomic systems [2].
[1] Willke et al., Nature Physics 15, 1005-1010 (2019).
[2] Kovarik, Schlitz et al., submitted.
Keywords: spin torque; magnetic resonance; scanning tunneling microscopy; molecules; magnetic resonance imaging