Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 44: Surface Magnetism (jointly with O)

MA 44.10: Vortrag

Donnerstag, 14. März 2013, 17:45–18:00, H3

Magnetic coupling of single Co adatoms through Pd spacer layers — •Liudmila Dzemiantsova, Mahboubeh Hortamani, Christian Hanneken, André Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger — Institut für Angewandte Physik, Universität Hamburg, Germany

The knowledge about the magnetic coupling on the atomic scale is crucial for the tailoring magnetic devices in reduced dimensions and the tuning their properties [1]. In particular, the dependence of the exchange coupling of magnetic adatoms on the thickness of the spacer layer is important for the fundamental understanding of magnetism and practical applications in spin-based technology [2].

We performed a combined experimental and theoretical investigation of Co atoms on top of a Pd spacer on Co/Ir(111). Using spin-polarized STM, spin contrast is achieved on Pd mono (ML)- and double-layer (DL) and on Co adatoms, which means that the electron density above the surfaces and adatoms is spin-polarized. In accordance with our experimental observations of Co atoms on the Pd spacer, our ab initio calculations show that Co layers adsorbed on top of a Pd mono- and double-layer are ferromagnetically coupled to the Co/Ir(111) underneath. The size of the magnetic coupling is reduced by a factor of three from a ML to a DL Pd spacer between the Co layers [3].

[1] F. Meier et al., Science, 320, 82 (2008).
[2] A. A. Khajetoorians et al., Science, 332, 1062 (2011).
[3] L. V. Dzemiantsova et al., Phys. Rev. B, 86, 094427 (2012).