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Co double-layer nanostructures on Pt(111) studied by spin-polarized scanning tunnelling microscopy

F Meier1, K von Bergmann, J Wiebe, M Bode and R Wiesendanger

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Spin-resolved scanning tunnelling microscopy measurements were performed for Co double-layer nanostructures on Pt(1 1 1). High-resolution spectroscopy shows that the electronic structure is highly inhomogeneous due to dislocations induced by the lattice mismatch between Pt and Co. Spin-polarized measurements allow a magnetic state dependent determination of out-of-plane magnetized islands. In the presence of external fields we have observed two different types of Co double-layer islands which exhibit a surprisingly large coercivity depending on their preparation.


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PACS

61.46.-w Structure of nanoscale materials

75.75.+a Magnetic properties of nanostructures

73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals

68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)

75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 5 (7 March 2007)

Received 6 September 2006, in final form 27 November 2006

Published 16 February 2007



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