Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Raksha Sharma; Subhalakshmi Lamba; S. Annapoorni; Parmanand Sharma; Akihisa Inoue

doi:10.1063/1.1829788

Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Raksha Sharma, Subhalakshmi Lamba, S. Annapoorni, Parmanand Sharma, Akihisa Inoue

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

γ- Fe2 O3 prepared by sol gel process was used to produce nanocomposites with polyaniline of varying aniline concentrations. Transmission electron microscopy (TEM) shows the presence of chain like structure for lower polyaniline concentration. The room temperature hysteresis curves show finite coercivity of ~160 Oe for all the composites, while the saturation magnetization was found to decrease with increasing polymer content. Zero field cooled-field cooled magnetization measurements indicate high blocking temperatures. It is believed that this indicates a strongly interacting system, which is also shown by our TEM results. Monte Carlo simulations performed on a random anisotropy model with dipolar and exchange interactions match well with experimental results.

Original language	English
Article number	014311
Journal	Journal of Applied Physics
Volume	97
Issue number	1
DOIs	https://doi.org/10.1063/1.1829788
Publication status	Published - 2005 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.1829788

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abstract = "γ- Fe2 O3 prepared by sol gel process was used to produce nanocomposites with polyaniline of varying aniline concentrations. Transmission electron microscopy (TEM) shows the presence of chain like structure for lower polyaniline concentration. The room temperature hysteresis curves show finite coercivity of ~160 Oe for all the composites, while the saturation magnetization was found to decrease with increasing polymer content. Zero field cooled-field cooled magnetization measurements indicate high blocking temperatures. It is believed that this indicates a strongly interacting system, which is also shown by our TEM results. Monte Carlo simulations performed on a random anisotropy model with dipolar and exchange interactions match well with experimental results.",

author = "Raksha Sharma and Subhalakshmi Lamba and S. Annapoorni and Parmanand Sharma and Akihisa Inoue",

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AU - Lamba, Subhalakshmi

AU - Annapoorni, S.

AU - Sharma, Parmanand

AU - Inoue, Akihisa

N1 - Funding Information: One of the authors (R.S.) wishes to acknowledge Council of Scientific and Industrial Research (CSIR), India for financial support. The authors wish to acknowledge the Department of Science and Technology (DST), India for their financial assistance through their project (SR∕S5∕NM-52∕2002) from their Nanoscience and Technology Initiative programme. They also acknowledge the help extended by Dr. N. C. Mehra and Dr. S. K. Shukla at the University Science and Instrumentation Centre, University of Delhi.

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N2 - γ- Fe2 O3 prepared by sol gel process was used to produce nanocomposites with polyaniline of varying aniline concentrations. Transmission electron microscopy (TEM) shows the presence of chain like structure for lower polyaniline concentration. The room temperature hysteresis curves show finite coercivity of ~160 Oe for all the composites, while the saturation magnetization was found to decrease with increasing polymer content. Zero field cooled-field cooled magnetization measurements indicate high blocking temperatures. It is believed that this indicates a strongly interacting system, which is also shown by our TEM results. Monte Carlo simulations performed on a random anisotropy model with dipolar and exchange interactions match well with experimental results.

AB - γ- Fe2 O3 prepared by sol gel process was used to produce nanocomposites with polyaniline of varying aniline concentrations. Transmission electron microscopy (TEM) shows the presence of chain like structure for lower polyaniline concentration. The room temperature hysteresis curves show finite coercivity of ~160 Oe for all the composites, while the saturation magnetization was found to decrease with increasing polymer content. Zero field cooled-field cooled magnetization measurements indicate high blocking temperatures. It is believed that this indicates a strongly interacting system, which is also shown by our TEM results. Monte Carlo simulations performed on a random anisotropy model with dipolar and exchange interactions match well with experimental results.

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Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Abstract

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