Journal
SURFACE SCIENCE
Volume 507, Issue -, Pages 609-614Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(02)01323-7
Keywords
nickel; conductivity; surface electronic phenomena (work function, surface potential, surface states, etc.)
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The lowest conductance step for a Ni nanocontact is anomalously small in comparison with the large expected number of conducting channels. We present electronic structure calculations for an extremely idealized Ni nanobridge consisting of just a monatomic nanowire. Our calculations show that no less than eight single spin bands cross the Fermi level in a nonmagnetic Ni monatomic wire, dropping marginally to seven in the more stable, fully ferromagnetic state. However, when we build in the wire a magnetization reversal, or domain wall, by forcing the net magnetization to be zero, we suddenly find that d-electrons selectively cease to propagate across the wall. s-electron propagation remains, and can account for the small observed conductance steps. (C) 2002 Elsevier Science B.V. All rights reserved.
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