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Journal of Nanomaterials - Volume 2015 2015, Article ID 587847, 10 pages -

Research Article

Department of Physics and Geology, The University of Texas Pan American, 1201 W. University Drive, Edinburg, TX 78504, USA

Department of Physics and Astronomy, University of Nebraska, Lincoln, NE 68588, USA

Department of Electrical Engineering, Meliksah University, Talas, 38289 Kayseri, Turkey

Received 4 December 2014; Revised 29 March 2015; Accepted 31 March 2015

Academic Editor: Mohamed Bououdina

Copyright © 2015 Mircea Chipara et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

FePt nanoclusters have been implanted onto polyimide films and subjected to thermal annealing in order to obtain a special magnetic phase L10 dispersed within the polymer. SQUID measurements quantified the magnetic features of the as-prepared and annealed hybrid films. As-implanted FePt nanoparticles in polyimide films exhibited a blocking temperature of 70 ± 5 K. Thermal annealing in zero and 10 kOe applied magnetic field increased the magnetic anisotropy and coercivity of the samples. Wide Angle X-Ray Scattering confirmed the presence of FePt and L10 phase. All samples as deposited and annealed exhibited electron spin resonance spectra consisting of two overlapping lines. The broad line was a ferromagnetic resonance originating from FePt nanoparticles. Its angular dependence indicated the magnetic anisotropy of FePt nanoparticles. SEM micrographs suggest a negligible coalescence of FePt nanoparticles, supporting that the enhancement of the magnetic properties is a consequence of the improvement of the L10 structure. The narrow ESR line was assigned to nonmagnetic paramagnetic impurities within the samples consistent with graphite-like structures generated by the local degradation of the polymer during implantation and annealing. Raman spectroscopy confirmed the formation of graphitic structures in annealed KHN and in KHN-FePt.





Autor: Mircea Chipara, Tom George, Yingfan Xu, Ralph Skomski, Lanping Yue, Nasar Ali, and David J. Sellmyer

Fuente: https://www.hindawi.com/



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