Quantized conductance of a single magnetic atom.
A single Co atom adsorbed on Cu(111) or on ferromagnetic Co islands is contacted with nonmagnetic W or ferromagnetic Ni tips in a scanning tunneling microscope. When the Co atom bridges two nonmagnetic electrodes a conductance of approximately 2e;{2}/h is found. With two ferromagnetic electrodes a conductance of approximately e;{2}/h is observed.
Néel
N
N
Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.
Kröger
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J
Berndt
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R