Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1829788· OSTI ID:20664975

Sharma, Raksha; Lamba, Subhalakshmi; Annapoorni, S; Sharma, Parmanand; Inoue, Akihisa ^[1]

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1. Department of Physics and Astrophysics, Delhi University, Delhi 110007 (India)

{gamma}-Fe{sub 2}O{sub 3} 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 {approx}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.

• OSTI ID: 20664975
• Journal Information: Journal of Applied Physics, Vol. 97, Issue 1; Other Information: DOI: 10.1063/1.1829788; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANILINE
ANISOTROPY
COERCIVE FORCE
COMPOSITE MATERIALS
COMPUTERIZED SIMULATION
EXCHANGE INTERACTIONS
FERROMAGNETIC MATERIALS
HYSTERESIS
IRON OXIDES
MAGNETIC PROPERTIES
MAGNETIZATION
MONTE CARLO METHOD
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
POLYMERS
RANDOMNESS
SOL-GEL PROCESS
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY