Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 26: Surface Magnetism

O 26.3: Vortrag

Dienstag, 6. September 2022, 11:00–11:15, H4

Inelastic Electron Tunneling through Nanomagnetic Structures — •Daria Medvedeva and Jindrich Kolorenč — Institute of Physics (FZU), Czech Academy of Sciences

Inelastic electron tunneling spectroscopy (IETS) is a well-established technique used for investigation of vibrational spectra and, more recently, also for characterization of spin excitations in nanosystems probed in scanning tunneling microscopes (STM). If a magnetic molecule is attached to the STM tip, the possibilities of the probe are expanded [1], for instance, one can observe how excitations in the molecule are modified by exchange interactions with the magnetic nanosystem adsorbed on a surface. We use an in-house implementation of cotunneling theory [2] to model IETS spectra of an STM tip decorated with nickelocene molecule (having spin 1) probing magnetic atoms with spins 3/2 and 2 subject to easy-axis anisotropy of varied direction. Experimentally, these situations were recently realized in an Fe adatom on Cu(100) [1] and in metal-organic chains, incorporating Co and Cr atoms, placed on Au(111) [3]. We discuss how accurate the theory is in reproducing the measured inelastic spectra, how the spectra depend on the direction of the magnetic anisotropy, and how important the appropriate alignment of the anisotropies of the probing molecule and the other spin is for efficient spin sensing.

* e-mail: medvedeva@fzu.cz, kolorenc@fzu.cz

[1] B. Verlhac et al., Science 366, 623 (2019); [2] F. Delgado and J. Fernández-Rossier, Phys. Rev. B 84, 045439 (2011); [3] Ch. Wäckerlin et al., to be submitted (2022).