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Structural and Magnetic Properties of Granular Co-ZrO2 Films

Published online by Cambridge University Press:  01 February 2011

Z Konstantinović ,
M García del Muro ,
B J Hattink ,
M Varela ,
X Batlle  and
A Labarta
Z Konstantinović
Affiliation:
Departament de Fïsica Aplicada i òptica, Universitat de Barcelona, Avinguda Diagonal 647, 08028-Barcelona, Spain
M García del Muro
Affiliation:
Departament de Fïsica Aplicada i òptica, Universitat de Barcelona, Avinguda Diagonal 647, 08028-Barcelona, Spain
B J Hattink
Affiliation:
Departament de Fïsica Aplicada i òptica, Universitat de Barcelona, Avinguda Diagonal 647, 08028-Barcelona, Spain
M Varela
Affiliation:
Departament de Fïsica Aplicada i òptica, Universitat de Barcelona, Avinguda Diagonal 647, 08028-Barcelona, Spain
X Batlle
Affiliation:
Departament de Fïsica Aplicada i òptica, Universitat de Barcelona, Avinguda Diagonal 647, 08028-Barcelona, Spain
A Labarta
Affiliation:
Departament de Fïsica Aplicada i òptica, Universitat de Barcelona, Avinguda Diagonal 647, 08028-Barcelona, Spain
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Abstract

We present here the growth of Co-ZrO2 granular films by pulsed laser deposition (PLD). Co-ZrO2 prepared with PLD is an ideal system for investigating the properties of magnetic nanoparticle since the Co-ZrO2 interfaces are of high quality with no evidence of intermixing. The average composition of the samples is determined by x-ray photoemission spectroscopy and microprobe exsperiments. High resolution scanning electron microscopy shows existence of a regular distribution of Co nanoparticles embedded in the amorphous ZrO2 matrix. Ferromagnetic correlations among the Co nanoparticules are evident in the field-cooled state. The mean particle size and width of the distribution are determined by fitting the low-field magnetic susceptibility and isothermal magnetization in the paramagnetic regime to a distribution of Langevin functions. Magnetoresistance confirms its origin from the particle magnetization and also validates information about the particle distribution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S6.24
Copyright
Copyright © Materials Research Society 2005

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