Magnetically induced optical activity and dichroism of gadolinium oxide nanoparticle-based ferrofluids

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3682765· OSTI ID:22038870

Paul, Nibedita; Devi, Manasi; Mohanta, Dambarudhar ^[1]; Saha, Abhijit ^[2]

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1. Nanoscience and Soft Matter Laboratory, Department of Physics, Tezpur University, PO Napaam, Tezpur 784 028, Assam (India)
2. UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata 700 098 (India)

The present work reports on magnetically induced optical activity (such as Faraday rotation and linear dichroism) of pristine and gamma-irradiated gadolinium oxide (Gd{sub 2}O{sub 3}) nanoparticle-based ferrofluids. The ferrofluids were produced by dispersing N-cetyl-N,N,N-trimethyl ammonium bromide (CTAB)-coated {approx}9-nm-sized Gd{sub 2}O{sub 3} particles in a carrier fluid of ethanol. The ferrofluids were then irradiated with 1.25 MeV energetic gamma rays (dose: 868 Gy and 2.635 kGy). Irradiation-led formation of a number of point defects was revealed through high resolution electron microscopy. The interaction of light with the ionized point defects is believed to have caused substantial improvement in the magneto-optic response of irradiated magnetic fluids.

• OSTI ID: 22038870
• Journal Information: Journal of Applied Physics, Vol. 111, Issue 4; Other Information: (c) 2012 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
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMMONIUM COMPOUNDS
BROMIDES
DICHROISM
ELECTRON MICROSCOPY
ETHANOL
FARADAY EFFECT
FERROMAGNETIC MATERIALS
GADOLINIUM OXIDES
GAMMA RADIATION
IONIZATION
IRRADIATION
MEV RANGE
NANOSTRUCTURES
OPTICAL ACTIVITY
PARTICLES
POINT DEFECTS
RADIATION EFFECTS