Modifying the morphology and magnetic properties of magnetite nanoparticles using swift heavy ion irradiation》.pdfVIP

Nuclear Instruments and Methods in Physics Research B 333 (2014) 64–68 Contents lists available at ScienceDirect Nuclear Instruments and Methods in Physics Research B journal homepage: www.else /locate/nimb Modifying the morphology and magnetic properties of magnetite nanoparticles using swift heavy ion irradiation Shubha Gokhale a,⇑, Subhalakshmi Lamba a, Neha Kumari a, Bhupendra Singh a, D.K. Avasthi b, S.K. Kulkarni c a School of Sciences, Indira Gandhi National Open University, New Delhi 110068, India b Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India c Indian Institute of Science Education Research, Dr. Homi Bhabha Road, Pune 411008, India a r t i c l e i n f o a b s t r a c t Article history: Magnetite (Fe O ) nanospheres of 8–11 nm diameter synthesized using a chemical co-precipitation 3 4 Received 21 February 2014 method were deposited as thin films on different substrates using spin coating. The thin films were Received in revised form 28 April 2014 irradiated with Ag ions at 100 MeV energy. Comparison of unirradiated, as synthesized Fe3O4 nanopartic- Accepted 28 April 2014 ulate thin film and ion irradiated film shows that irradiation causes dramatic changes in the morphology, Available online 24 May 2014 structure and magnetic properties. Monte Carlo simulations carried out on this system indicate that the origin of the changes in the magnetic properties lies