Selective d-state Conduction Blocking in Nickel Nanocontacts

Details Selective d-state Conduction Blocking in Nickel Nanocontacts Selective d-state Conduction Blocking in Nickel Nanocontacts

2001-11-20

arxiv.org/abs/cond-mat/0111376v1

Physics

Condensed Matter

Materials Science

9 pages, 4 figures, Surface Science, to appear

Scientific paper

10.1016/S0039-6028(02)01323-7

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.

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