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Please use this identifier to cite or link to this item: http://purl.org/purl/4391

Title: Nonlinear and magneto-optical transmission studies on magnetic nanofluids of non-interacting metallic nickel nanoparticles
Authors: Anantharaman, M R
Reena Mary, A P
Suchand Sandeep, C S
Narayanan, T N
Reji, Philip
Padraig, Moloney
Ajayan, P M
Issue Date: 19-Aug-2011
Publisher: IOP Publishing LTD
Abstract: Oxide free stable metallic nanofluids have the potential for various applications such as in thermal management and inkjet printing apart from being a candidate system for fundamental studies. A stable suspension of nickel nanoparticles of ∼5 nm size has been realized by a modified two-step synthesis route. Structural characterization by x-ray diffraction and transmission electron microscopy shows that the nanoparticles are metallic and are phase pure. The nanoparticles exhibited superparamagnetic properties. The magneto-optical transmission properties of the nickel nanofluid (Ni-F) were investigated by linear optical dichroism measurements. The magnetic field dependent light transmission studies exhibited a polarization dependent optical absorption, known as optical dichroism, indicating that the nanoparticles suspended in the fluid are non-interacting and superparamagnetic in nature. The nonlinear optical limiting properties of Ni-F under high input optical fluence were then analyzed by an open aperture z-scan technique. The Ni-F exhibits a saturable absorption at moderate laser intensities while effective two-photon absorption is evident at higher intensities. The Ni-F appears to be a unique material for various optical devices such as field modulated gratings and optical switches which can be controlled by an external magnetic field
Description: Nanotechnology 22 (2011) 375702 (7pp)
URI: http://dyuthi.cusat.ac.in/purl/4391
Appears in Collections:Dr. M R Anantharaman

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