Granular multilayers with were prepared by sequential pulsed laser deposition. Transmission electron microscopy (TEM) images show that increasing causes the growth of the sizes of Fe nanoparticles and broadening of the particle size distribution. For , continuous Fe layers are formed. The evolution of the shapes and sizes of the particles is reflected in the magnetic properties of the investigated films. A crossover from superparamagnetic to ferromagnetic behavior upon formation of a continuous Fe layer is observed. The fit of zero field cooled and field cooled susceptibility measurements and magnetization curves using Curie–Weiss law and a weighted sum of Langevin functions, respectively, allows the estimation of the average granule size for the films with . The results of the estimations correlate with the data obtained from TEM images. Reduction of saturation magnetization for Fe nanoparticles and an increase of the coercivity up to at low temperatures were found. It is attributed to the formation of Fe-core∕-shell structured nanocrystals. The oxide shell gives rise to a strong contribution of surface anisotropy. Isotropic tunneling magnetoresistance up to at room temperature and in magnetic field up to was found for the film with . For higher , an anisotropic magnetoresistance typical for continuous ferromagnetic films was observed.
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15 March 2009
Research Article|
March 20 2009
Magnetic properties of granular multilayers prepared by pulsed laser deposition
A. García-García;
A. García-García
1Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC
, 50009-Zaragoza, Spain
2Departamento de Física de la Materia Condensada,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
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A. Vovk;
A. Vovk
a)
2Departamento de Física de la Materia Condensada,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
3Instituto de Nanociencia de Aragón,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
4Institute of Magnetism,
NAS of Ukraine
, 36-b Vernnadsky Blvd., 03142, Kyiv, Ukraine
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J. A. Pardo;
J. A. Pardo
3Instituto de Nanociencia de Aragón,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
5Departamento de Ciencia y Tecnología de Materiales y Fluidos,
Universidad de Zaragoza
, 50018-Zaragoza, Spain
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P. Štrichovanec;
P. Štrichovanec
3Instituto de Nanociencia de Aragón,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
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C. Magén;
C. Magén
3Instituto de Nanociencia de Aragón,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
6Centre d’Elaboration de Matériaux et d’Etudes Structurales,
CNRS
, 31055-Toulouse, France
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E. Snoeck;
E. Snoeck
6Centre d’Elaboration de Matériaux et d’Etudes Structurales,
CNRS
, 31055-Toulouse, France
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P. A. Algarabel;
P. A. Algarabel
1Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC
, 50009-Zaragoza, Spain
2Departamento de Física de la Materia Condensada,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
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J. M. De Teresa;
J. M. De Teresa
1Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC
, 50009-Zaragoza, Spain
2Departamento de Física de la Materia Condensada,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
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L. Morellón;
L. Morellón
1Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC
, 50009-Zaragoza, Spain
2Departamento de Física de la Materia Condensada,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
3Instituto de Nanociencia de Aragón,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
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M. R. Ibarra
M. R. Ibarra
1Instituto de Ciencia de Materiales de Aragón,
Universidad de Zaragoza-CSIC
, 50009-Zaragoza, Spain
2Departamento de Física de la Materia Condensada,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
3Instituto de Nanociencia de Aragón,
Universidad de Zaragoza
, 50009-Zaragoza, Spain
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a)
Electronic mail: avovk@unizar.es.
J. Appl. Phys. 105, 063909 (2009)
Article history
Received:
October 21 2008
Accepted:
February 05 2009
Citation
A. García-García, A. Vovk, J. A. Pardo, P. Štrichovanec, C. Magén, E. Snoeck, P. A. Algarabel, J. M. De Teresa, L. Morellón, M. R. Ibarra; Magnetic properties of granular multilayers prepared by pulsed laser deposition. J. Appl. Phys. 15 March 2009; 105 (6): 063909. https://doi.org/10.1063/1.3093945
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