Recording-media-related morphology and magnetic properties of crystalline CoPt{sub 3} and CoPt{sub 3}-Au core-shell nanoparticles synthesized via reverse microemulsion

A comparative experimental study of the magnetic properties of CoPt{sub 3} and CoPt{sub 3}/Au nanoparticles as well as a detailed study of the structural properties of the samples by X-ray diffraction, Transmission electron microscopy, and vibrating sample magnetometer is presented in this work. In...

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Bibliographic Details
Published in:Journal of applied physics 2014-09, Vol.116 (9)
Main Authors: Bahmanrokh, Ghazaleh, Hashim, Mansor, Matori, Khamirul Amin, Kanagesan, Samikannu, Sabbaghizadeh, Rahim, Ezzad Shafie, Mohd Shamsul, Navasery, Manizheh, Soltani, Nayereh, Vaziri, Parisa
Format: Article
Language:English
Subjects:
COERCIVE FORCE
CURIE-WEISS LAW
FERROMAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
MATERIALS SCIENCE
MICROEMULSIONS
NANOPARTICLES
PARTICLE SIZE
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION
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Summary:A comparative experimental study of the magnetic properties of CoPt{sub 3} and CoPt{sub 3}/Au nanoparticles as well as a detailed study of the structural properties of the samples by X-ray diffraction, Transmission electron microscopy, and vibrating sample magnetometer is presented in this work. In addition, the effect of particle size on the structure and magnetic properties of nanoparticles prepared by microemulsion is studied. The correlation between particle size, crystallinity, and magnetization was studied as well. CoPt nanoparticles have been studied intensively over the last decade because of their increased magnetic anisotropy in the ordered phase that can be interesting for high density magnetic recording. A significant high coercivity for as-prepared CoPt{sub 3} and CoPt{sub 3}-Au nanoparticles was obtained at room temperature and enhanced after annealing. The focused aim of our study is to obtain high coercivity at room temperature that follows the Curie-Weiss law. This indicates an interacting system in which the nanoparticles behave like single domain ferromagnetic materials in the particle size range of 8 to 35 nm. In addition, the interaction increases by cooling the samples to low temperature around 15 K. Temperature dependence 1/M graph was obtained to investigate the behavior of nanoparticles at low temperature and shows the best fit with Curie-Weis mode.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4894154