Magnetic and magnetotransport properties of Fe nanoparticles embedded in Ag matrix

Fe 20 Ag 80 and Fe 30 Ag 70 granular thin films have been prepared by the pulsed laser deposition technique under different parameter conditions of pulse frequency and target angular speed. Their influence on the microstructure of the sample, through the analysis of the hysteresis loops, magnetotran...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2005-04, Vol.290, p.1071-1074
Main Authors: Sarmiento, G., García Prieto, A., Orue, I., Fdez-Gubieda, M.L.
Format: Article
Language:English
Subjects:
Granular systems
Hysteresis loops
Magnetoresistance-thin films
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Summary:Fe 20 Ag 80 and Fe 30 Ag 70 granular thin films have been prepared by the pulsed laser deposition technique under different parameter conditions of pulse frequency and target angular speed. Their influence on the microstructure of the sample, through the analysis of the hysteresis loops, magnetotransport response and magnetooptical Kerr effect, has been investigated. The Fe 20 Ag 80 samples present a superparamagnetic phase, composed of spherical Fe clusters with a mean diameter of 3 nm. The number of Fe nanoparticles increases as both laser pulse frequency and target angular speed increase, thus enhancing their giant magnetoresistance response. The Fe 30 Ag 70 thin films have anisotropic magnetic behaviour and their magnetotransport measurements show giant magnetoresistance and extraordinary Hall effect. These anisotropies suggest the presence of Fe planar particles, which give rise to shape magnetic anisotropy that increases with increasing the target angular speed for a given laser pulse frequency. The planar shape of the Fe particles could be in the origin of the dominant extraordinary Hall effect.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2004.11.461