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We present a first-principles study on the spin denpendent conductance offive single-atom magnetic junctions consisting of a magnetic tip and an adatomadsorbed on a magnetic surface, i.e., the Co-Co/Co(001) and Ni-X/Ni(001) (X=Fe,Co, Ni, Cu) junctions. When their spin configuration changes fromferromagnetism to anti-ferromagnetism, the spin-up conductance increases whilethe spin-down one decreases. For the junctions with a magnetic adatom, there isnearly no spin valve effect as the decreased spin-down conductance counteractsthe increased spin-up one. For the junction with a nonmagnetic adatom(Ni-Cu/Ni(001)), a spin valve effect is obtained with a variation of 22% in thetotal conductance. In addition, the change in spin configuration enhances thespin filter effect for the Ni-Fe/Ni(001) junction but suppresses it for theother junctions.

Conductance of Ferro- and Antiferro-magnetic single-atom contacts: A first-principles study