Magnetic Properties of Ni/NiO Core-Shell Nanoparticles Synthesized by Nanosecond Laser Irradiance of Water Suspended Ni Particles
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
Magnetic Properties of Ni/NiO Core-Shell Nanoparticles Synthesized by Nanosecond Laser Irradiance of Water Suspended Ni Particles
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| Creator |
Singh, Manish Kumar
Agarwal, Arvind Swarnkar, Raj Kumar Gopal, Ram Kotnala, R. K. |
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| Subject |
Materials Science
Applied Physics/Condensed Matter Nanoscience/ Nanotechnology |
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| Description |
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.
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| Publisher |
American Scientific Publishers
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| Date |
2012-03
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/3506/1/Magnetic%20Properties.pdf
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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| Relation |
http://npl.csircentral.net/3506/
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