Singh, Manish Kumar and Agarwal, Arvind and Swarnkar, Raj Kumar and Gopal, Ram and Kotnala, R. K. (2012) Magnetic Properties of Ni/NiO Core-Shell Nanoparticles Synthesized by Nanosecond Laser Irradiance of Water Suspended Ni Particles. Science of Advanced Materials, 4 (SI 3-4). pp. 532-536. ISSN 1947-2935

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Abstract

Ni/NiO nanoparticles have been prepared by nanosecond laser irradiance. The nanoparticles formation is attributed absorption of the laser at impurities or defects site within the nickel microcrystal inducing thermoelastic stress that mechanically fractures microparticles into smaller nanoparticles. The particle size ranges from 20 to 45 nm with different shapes of the particles: spherical, and spiral like structures. The high resolution transmission electron microscopy (HRTEM) shows polycrystalline cores (Ni) with predominantly amorphous shells (NiO) of spiral like structure. The saturation magnetization (M-s), remanent magnetization (M-r) and coercivity (H-c) determined to be 33.4 emu/g, 1.94 emu/g and 46.4 Oe respectively for these nanoparticles. Zero-field-cooling (ZFC) and field cooling (FC) magnetization measurements were performed using a vibrating sample magnetometer from 90 to 300 K. The Curie temperature of nickel nanoparticles was found to be 395 degrees C.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Scientific Publishers.
Subjects:	Materials Science Applied Physics/Condensed Matter Nanoscience/ Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	13 Mar 2020 11:33
Last Modified:	13 Mar 2020 11:33
URI:	http://npl.csircentral.net/id/eprint/3506

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