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Title: Conductance of ferro- and antiferro-magnetic single-atom contacts: A first-principles study

We present a first-principles study on the spin dependent conductance of five single-atom magnetic junctions consisting of a magnetic tip and an adatom adsorbed 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 from ferromagnetism to anti-ferromagnetism, the spin-up conductance increases while the spin-down one decreases. For the junctions with a magnetic adatom, there is nearly no spin valve effect as the decreased spin-down conductance counteracts the 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 the total conductance. In addition, the change in spin configuration enhances the spin filter effect for the Ni-Fe/Ni(001) junction but suppresses it for the other junctions.
Authors:
 [1] ; ; ;  [2] ;  [3]
  1. School of Physics and Mechanical and Electrical Engineering, Zunyi Normal College, Zunyi (China)
  2. Department of Physics, Shanghai Normal University, 100 Guilin Road, Shanghai 200232 (China)
  3. Department of Physics, Key Laboratory of Advanced Microstructured Materials, MOE, Tongji University, 1239 Siping Road, Shanghai 200092 (China)
Publication Date:
OSTI Identifier:
22218237
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 6; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETIC MATERIALS; ATOMS; COBALT; COBALT ALLOYS; COPPER ALLOYS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; IRON ALLOYS; MAGNETIC SURFACES; NICKEL; NICKEL ALLOYS; SPIN