Magnetism of FePt Nanoclusters in Polyimide

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish (US)
Article number587847
JournalJournal of Nanomaterials
Volume2015
DOIs
StatePublished - Jan 1 2015

Fingerprint

Nanoclusters
Magnetism
Polyimides
Nanoparticles
Magnetic anisotropy
Annealing
Paramagnetic resonance
Polymers
Ferromagnetic resonance
Graphite
SQUIDs
Coercive force
X ray scattering
Coalescence
Ion implantation
Raman spectroscopy
Magnetic properties
Impurities
Magnetic fields
Degradation

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Chipara, M., George, T., Xu, Y., Skomski, R., Yue, L., Ali, N., & Sellmyer, D. J. (2015). Magnetism of FePt Nanoclusters in Polyimide. Journal of Nanomaterials, 2015, [587847]. https://doi.org/10.1155/2015/587847

Magnetism of FePt Nanoclusters in Polyimide. / Chipara, Mircea; George, Tom; Xu, Yingfan; Skomski, Ralph; Yue, Lanping; Ali, Nasar; Sellmyer, David J.

In: Journal of Nanomaterials, Vol. 2015, 587847, 01.01.2015.

Research output: Contribution to journalArticle

Chipara, M, George, T, Xu, Y, Skomski, R, Yue, L, Ali, N & Sellmyer, DJ 2015, 'Magnetism of FePt Nanoclusters in Polyimide', Journal of Nanomaterials, vol. 2015, 587847. https://doi.org/10.1155/2015/587847
Chipara M, George T, Xu Y, Skomski R, Yue L, Ali N et al. Magnetism of FePt Nanoclusters in Polyimide. Journal of Nanomaterials. 2015 Jan 1;2015. 587847. https://doi.org/10.1155/2015/587847
Chipara, Mircea ; George, Tom ; Xu, Yingfan ; Skomski, Ralph ; Yue, Lanping ; Ali, Nasar ; Sellmyer, David J. / Magnetism of FePt Nanoclusters in Polyimide. In: Journal of Nanomaterials. 2015 ; Vol. 2015.
@article{d730319b79fd46c98a0f0e6b9e52cfcd,
title = "Magnetism of FePt Nanoclusters in Polyimide",
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.",
author = "Mircea Chipara and Tom George and Yingfan Xu and Ralph Skomski and Lanping Yue and Nasar Ali and Sellmyer, {David J.}",
year = "2015",
month = "1",
day = "1",
doi = "10.1155/2015/587847",
language = "English (US)",
volume = "2015",
journal = "Journal of Nanomaterials",
issn = "1687-4110",
publisher = "Hindawi Publishing Corporation",

}

TY - JOUR

T1 - Magnetism of FePt Nanoclusters in Polyimide

AU - Chipara, Mircea

AU - George, Tom

AU - Xu, Yingfan

AU - Skomski, Ralph

AU - Yue, Lanping

AU - Ali, Nasar

AU - Sellmyer, David J.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84929630319&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84929630319&partnerID=8YFLogxK

U2 - 10.1155/2015/587847

DO - 10.1155/2015/587847

M3 - Article

AN - SCOPUS:84929630319

VL - 2015

JO - Journal of Nanomaterials

JF - Journal of Nanomaterials

SN - 1687-4110

M1 - 587847

ER -