AVS 47th International Symposium
    Magnetic Interfaces and Nanostructures Thursday Sessions
       Session MI+NS+NANO 6-ThM

Paper MI+NS+NANO 6-ThM4
Ferromagnetic Resonance of Monodisperse Co Particles

Thursday, October 5, 2000, 9:20 am, Room 206

Session: Nanomagnetism
Presenter: M. Farle, Technische Universitaet Braunschweig, Germany
Authors: M. Farle, Technische Universitaet Braunschweig, Germany
U. Wiedwald, Technische Universitaet Braunschweig, Germany
M. Hilgendorff, Hahn-Meitner-Institut Berlin, Germany
M. Giersig, Hahn-Meitner-Institut Berlin, Germany
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Quasi- twodimensional regular arrays of monodisperse 6 nm diameter Co particles can be produced on Carbon substrates by a monophoretic deposition technique from colloidal suspensions. Transmission electron microscopy reveals hexagonal ordering on micrometer scales for deposition at 0.8 Tesla and a bcc crystalline structure of the particles.@footnote1@ Ferromagnetic resonance (FMR) spectra at 296 K show a weak angular dependence near the paramagnetic resonance field with an easy in-plane magnetization axis . This shows a preferential alignment of the superparamagnetic particles in the film plane. A symmetric lineshape and linewidth dH < 0.1 Tesla is observed which indicates the high monodispersity in magnetic and geometric properties of the individual particles. Characteristic differences of the FMR spectra for different substrates and deposition parameters are observed and will be discussed in terms of simple dipolar coupling models. Supported through EC - grant no. HPRN-CT-1999-00150. @FootnoteText@ @footnote 1@ M. Giersig and M. Hilgendorff, J. Phys. D: Appl. Phys. 32 (1999) L111.