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O: Fachverband Oberflächenphysik
O 88: Electronic Structure: Surface Magnetism and Spin Phenomena
O 88.12: Vortrag
Donnerstag, 19. März 2015, 17:45–18:00, MA 042
Kondo resonance splitting by a spin current — Deung-Jang Choi1, Sébastien Guissart2, Pascal Simon2, and •Laurent Limot1 — 1IPCMS, Université de Strasbourg, UMR CNRS 7504, 67034 Strasbourg, France — 2Laboratoire de Physique des Solides, Université Paris-Sud 11, UMR CNRS 8502, 91405 Orsay, France
The downscaling of spintronic devices requires developing new strategies for sensing a spin current at the smallest possible length scale. Progress towards this goal has been achieved by experimental advances in probing individual magnetic impurities coupled to non-magnetic electrodes. The spin-flip scattering of an atom is in fact a powerful spin-sensitive spectroscopic probe and information can be gathered on the magnetic interactions, either direct or indirect, between the atom and its environment. Recently, a spin current tunneling into the atom could also be detected in this way provided that the atom ground state is spin-split by a magnetic field (external or effective).
Here we show that the detection of a spin current can be simplified by using the Kondo effect of a single-atom contact. For this purpose, we mimic a multilayered spintronic device by coating a bulk ferromagnetic tip with copper and form a stable single-atom contact with a cobalt atom adsorbed on a copper surface. We find that the strong coupling between the tip and the atom inherent to our contact measurement produces a spin current sufficiently high to promote alone a spin-split Kondo state, the spin polarization of the junction amounting up to 18%.