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Effect of Annealing on Magnetic Properties of Ni80Fe20 Permalloy Nanoparticles Prepared by Polyol Method

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Ni80Fe20 permalloy nanoparticles with narrow size distribution and homogeneous composition have been prepared by the polyol processing at 180 °C for 2 h and their particle sizes can be tunable in the size range of 20∼440 nm by proper addition of K2PtCl4 agent. X-ray diffraction results show that the NiFe nanoparticles are of face centered cubic structure. The addition of K2PtCl4 does not affect the composition of NiFe NPs but decreases the particle size remarkably. Both saturation magnetization and coercivity of the as-prepared NiFe nanoparticles decrease with decreasing particle size. Annealed at 280 °C, however, the saturation magnetization of various sized NiFe nanoparticles increases drastically and approaches to the bulk for the ∼440 nm NiFe particles, and a maximum coercivity (∼270 Oe) happens at a critical size of ∼50 nm. The magnetic property dependency of these NiFe nanoparticles on annealing has been discussed by considering the surface chemistry.
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Document Type: Research Article

Publication date: 2011-12-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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