J A De Toro et al 2009 Nanotechnology 20 085710 doi:10.1088/0957-4484/20/8/085710
J A De Toro1, J P Andrés, J A González, P Muñiz and J M Riveiro
Show affiliationsWe report on the unexpected deterioration under ambient conditions of films of Co clusters capped with relatively thick (>100 nm) Cu (or Ti) layers deposited by either thermal evaporation or by radiofrequency sputtering. The magnetic character of the clusters, prepared by gas-phase condensation, allows monitoring the oxidation of the samples through the decay of the saturation magnetization, which takes place on a timescale of days. By contrast, diluted (<10 at.%) cluster-assembled granular Co:Cu films, prepared by co-deposition of the Co clusters with a Cu vapour, are perfectly stable under ambient conditions. We tentatively explain the oxidation of the cluster films as stemming from their very high porosity.
75.75.+a Magnetic properties of nanostructures
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 8 (25 February 2009)
Received 29 October 2008, in final form 19 December 2008
Published 3 February 2009
J A De Toro et al 2009 Nanotechnology 20 085710
Matthias Hillenkamp et al 2007 Nanotechnology 18 015702
Hailin Cong et al 2009 Nanotechnology 20 075307
R Klein et al 2007 Phys. Med. Biol. 52 659
B M Graham and A Adler 2006 Physiol. Meas. 27 S65
Manuchehr Soleimani et al 2006 Physiol. Meas. 27 S103
Andy Adler et al 2009 Physiol. Meas. 30 S35
Xufeng Liu et al 2008 Nanotechnology 19 485602
Holger Lange et al 2009 Nanotechnology 20 045705
Jin He et al 2009 Nanotechnology 20 075102