Quantized Conductance of a Single Magnetic Atom
Abstract
A single Co atom adsorbed on Cu(111) or on ferromagnetic Co islands is contacted with non-magnetic W or ferromagnetic Ni tips in a scanning tunneling microscope. When the Co atom bridges two non-magnetic electrodes conductances of 2e2/h are found. With two ferromagnetic electrodes a conductance of e2/h is observed which may indicate fully spin-polarized transport.
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