Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 60: Nanomaterials - Nanoparticles

MM 60.3: Talk

Thursday, March 14, 2013, 16:15–16:30, H25

Magnetic Memory Effect in Chelated Zero Valent Iron Nanoparticles — •Nilotpal Ghosh, Badal Kumar Mandal, and Kesarla Mohan Kumar — School of Advanced Sciences, VIT University, Vellore-632014, Tamilnadu, India

We report the study of non-equilibrium magnetic behaviour of air stable Zero Valent Iron Nanoparticles synthesized in presence of N-cetyl-N,N,N-trimethyl ammonium bromide chelating agent. X-ray photoelectron spectroscopy study has suggested the presence of Iron oxides on nZVI surfaces. Zero-field-cooled and field-cooled magnetization measurements have been carried out at 20-300 K and 100 Oe. For field-cooled measurements with 1hr stops at 200, 100 and 50 K when compared with the warming cycle, we found the signature of magnetic memory effect. A study of magnetic relaxation at same the temperatures shows the existence of two relaxation times.

Reference : N. Ghosh, B.K. Mandal, K. M. Kumar, Journal of Magnetism and Magnetic materials 324 (2012)3839.