Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Focus Session: Spins on Surfaces I (joint session O/MA)

MA 45.3: Vortrag

Donnerstag, 4. April 2019, 11:15–11:30, H15

Sensing the spin of a spectroscopically dark Ce adatom with an STM — •Markus Ternes1,2, Chris Lutz3, Andreas Heinrich4,5, and Wolf-Dieter Schneider6,71RWTH Aachen University, Germany — 2Peter Grünberg Institute PGI-3, Forschungszentrum Jülich, Germany — 3IBM Almaden Research Center, San Jose, CA, USA — 4Center for Quantum Nanoscience, Institute for Basic Science, Seoul, Republic of Korea — 5Ewha Womans University, Seoul, Republic of Korea — 6Fritz- Haber-Institut, Berlin, Germany — 7École Polytechnique Fédérale de Lausanne, Switzerland

The magnetic moment of rare earth elements originates from the electrons of the partially filled 4f orbitals. Accessing this moment electrically as in a scanning tunneling spectroscopy experiment is difficult due to the effective shielding by electrons in the further outward lying 5d and 6s orbitals. However, recently the influence of 4f spins on the EPR signal of neighboring 3d spins has been used for its detection [1]. Here we use a different approach to detect the magnetic moment of a single Ce adatom on a Cu2N ultrathin film on Cu(100). We functionalize the tip apex with a second, Kondo screened spin which we can deliberately couple to other moments on the surface via the tunneling junction [2]. We calibrate this sensor against a well understood Fe atom and subsequently use the splitting of the Kondo resonance when approaching a spectroscopically dark Ce atom to determine its magnetic moment to ≈ 1 µB. [1] F. D. Natterer, et al., Nature 543, 226 (2017). [2] M. Muenks, et al., Nature Comm. 8, 14119 (2017).

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