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A spin-selective approach for surface states at Co nanoislands

A spin-selective approach for surface states at Co nanoislands During recent years the surface electronic states of cobalt nanoislands grown on Cu(111) and Au(111) have been extensively studied and still yield fascinating results. Among magnetic surfaces, cobalt islands are particularly appealing because of their spin-polarized electronic states near the Fermi energy, involving localized d states of minority character, as well as free-like s–p states of majority character. We show here that these states are a sensitive probe to minute changes of structural details such as strain and stacking, and therefore constitute an ideal playground to study the interplay between structural and spin-related properties. Due to their size, cobalt islands on Cu(111) offer the additional opportunity to host single-magnetic adsorbates suitable for spin-polarized scanning tunneling microscopy and spectroscopy (SP-STM and SP-STS). We establish here that, in an energy interval just below the Fermi level, the spin-polarization of a transition-metal atom is governed by surface-induced states opposite in sign compared to the island, while the spin-polarization of Co-Phthalocyanine molecules is governed by molecular states. This opens up interesting perspectives for controlling and engineering spin-polarized phenomena at the nanoscale. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The European Physical Journal B - Condensed Matter and Complex Systems Springer Journals

A spin-selective approach for surface states at Co nanoislands

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References (54)

Publisher
Springer Journals
Copyright
Copyright © 2010 by EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg
Subject
Physics; Solid State Physics; Fluid- and Aerodynamics; Statistical Physics, Dynamical Systems and Complexity; Physics, general; Condensed Matter Physics
ISSN
1434-6028
eISSN
1434-6036
DOI
10.1140/epjb/e2010-00054-1
Publisher site
See Article on Publisher Site

Abstract

During recent years the surface electronic states of cobalt nanoislands grown on Cu(111) and Au(111) have been extensively studied and still yield fascinating results. Among magnetic surfaces, cobalt islands are particularly appealing because of their spin-polarized electronic states near the Fermi energy, involving localized d states of minority character, as well as free-like s–p states of majority character. We show here that these states are a sensitive probe to minute changes of structural details such as strain and stacking, and therefore constitute an ideal playground to study the interplay between structural and spin-related properties. Due to their size, cobalt islands on Cu(111) offer the additional opportunity to host single-magnetic adsorbates suitable for spin-polarized scanning tunneling microscopy and spectroscopy (SP-STM and SP-STS). We establish here that, in an energy interval just below the Fermi level, the spin-polarization of a transition-metal atom is governed by surface-induced states opposite in sign compared to the island, while the spin-polarization of Co-Phthalocyanine molecules is governed by molecular states. This opens up interesting perspectives for controlling and engineering spin-polarized phenomena at the nanoscale.

Journal

The European Physical Journal B - Condensed Matter and Complex Systems – Springer Journals

Published: May 1, 2010

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