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, and R. Wiesendanger
Phys. Rev. B 74, 195411 – Published 13 November 2006

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 4nm 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 0.25T, double-layer islands show surprisingly large coercivities of more than 2T.

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  • Received 23 June 2006

DOI:https://doi.org/10.1103/PhysRevB.74.195411

©2006 American Physical Society

Authors & Affiliations

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

  • Institute of Applied Physics, University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

  • *Corresponding author. Email address: fmeier@physnet.uni-hamburg.de

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Issue

Vol. 74, Iss. 19 — 15 November 2006

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