Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 34: Posters: Graphene (with DY/DS/HL/O/TT)

MA 34.4: Poster

Wednesday, April 2, 2014, 17:00–20:00, P1

Electron spin resonance of ion-irradiation induced single vacancies on monolayer graphene characterized by scanning tunneling spectroscopy — •Sven Just¹, Stephan Zimmermann², Vladislav Kataev², Marco Pratzer¹, Bernd Büchner², and Markus Morgenstern¹ — ¹II. Physikalisches Institut B, RWTH Aachen — ²Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden

Single vacancies with densities of 0.003/nm² − 3/nm² are prepared on HOPG and on single layer graphene on SiO₂ produced by chemical vapour deposition using Ar ions with 50 eV kinetic energy. The vacancies exhibit a peak at E_F in scanning tunneling spectroscopy, which survives 3 h of air exposure, afterwards a small broadening of the peak is observed. Electron spin resonance shows a peak corresponding to g = 2.0022, if the defect density is above 0.3/nm², and a peak width of 10 G with an anisotropy below 0.5 G between in-plane and out-of-plane magnetic field. The peak width hardly depends on temperature, while the peak intensity decreases with increasing temperature in the range of 4 K - 20 K.