Spin-dependent electronic and magnetic properties of Co nanostructures on Pt(111) studied by spin-resolved scanning tunneling spectroscopy

F. Meier, K. Von Bergmann, P. Ferriani, J. Wiebe, M. Bode, K. Hashimoto, S. Heinze, R. Wiesendanger

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Spin-resolved scanning tunneling spectroscopy measurements at low temperatures were performed for Co nanostructures on Pt(111). On Co monolayer islands and wires the electronic structure changes on the scale of a few atoms due to the changing local stacking of the Co atoms. First-principles calculations for pseudomorphic fcc and hcp stacked Co monolayers assign the dominant feature in the measured spectra to a d -like surface resonance of minority-spin character which shifts in energy because of a different coupling to the Pt substrate. Despite the heterogeneous electronic structure of the Co monolayer, the out-of-plane magnetized domains are clearly observed. While the domain wall width measured on wires is less than 4 nm there is no indication for a change in the magnetization direction for islands with a base length up to fifteen times the domain wall width. Furthermore, the magnetic hysteresis in an ensemble of out-of-plane magnetized Co monolayer as well as double-layer nanostructures was observed. While the coercivity for the monolayer nanostructures is about 0.25 T, double-layer islands show surprisingly large coercivities of more than 2 T.

Original languageEnglish
Article number195411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number19
DOIs
Publication statusPublished - 2006 Nov 20
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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