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Enhanced magneto-optic activity of magnetite-based ferrofluids subjected to gamma irradiation

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A Publisher’s Erratum to this article was published on 14 December 2011

Abstract

We report here the effect of γ-irradiation on the particle size and size distribution dependent spectroscopic and magneto-optic properties of ferrofluids, synthesized by a co-precipitation method. The X-ray diffraction (XRD) study exhibits magnetite (Fe3O4) phase of the particles while electron microscopic and dynamic light scattering (DLS) studies have predicted particle growth upon γ-irradiation. Further, Fourier transform infrared (FT-IR) spectroscopy studies ensured that no dissociation has occurred due to irradiation effect. As a consequence of magneto-optic behavior reflected in the Faraday rotation (FR) measurement, the Verdet constant increased from a value of 0.64×10−2 for the pristine sample to 5.6×10−2 deg/Gauss-cm for the sample irradiated with the highest dose (2.635 kGy). The substantial enhancement in the FR is assigned to the improvement in associated chaining effect owing to adequate particle growth where an increased stoichiometry variation of Fe2+/Fe3+ is assured.

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Acknowledgements

We acknowledge UGC, New Delhi, for the financial support received under major project scheme No. 37-367/2009 (SR). The association of Ms. Nibedita Paul, RS, is acknowledged. We extend our sincere thanks to Dr. A. Dutta, UGC-DAE, CSR, Kolkata, for her help during γ-irradiation and DLS study. We are also thankful to SAIF, NEHU, Shillong, for extending TEM Facility. The FT-IR facility provided by the Department of Chemical Sciences, TU, is gratefully acknowledged.

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Authors and Affiliations

  1. Nanoscience and Soft Matter Laboratory, Department of Physics, Tezpur University, PO Napaam, Assam, 784028, India

    Manasi Devi, Rupali Das, Dambarudhar Mohanta & Kishor Kumar Baruah

  2. UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata, 700 098, India

    Abhijit Saha

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  1. Manasi Devi
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  2. Rupali Das
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Correspondence to Dambarudhar Mohanta.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00339-011-6723-3.

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Devi, M., Das, R., Mohanta, D. et al. Enhanced magneto-optic activity of magnetite-based ferrofluids subjected to gamma irradiation. Appl. Phys. A 106, 757–763 (2012). https://doi.org/10.1007/s00339-011-6678-4

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  • DOI: https://doi.org/10.1007/s00339-011-6678-4

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