Affiliation:
1. Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 702-701, South Korea
2. Department of Chemistry, Korea University, Jochiwon 339-700, South Korea
Abstract
We investigated the size dependent magnetic properties of Ni nanoparticles. We prepared four samples with average particle diameters of 7.0, 14.0, 16.5, and 20.0 nm. The blocking temperatures (TBs) were 40.0, 150.0, 250.0, and ~ 300.0 K for the above Ni nanoparticles, respectively. Saturation magnetization increased with increasing particle diameter due to the reduced magnetic moments of surface atoms. The coercivities at 5 K ranged from 270 and 340 Oe, whereas those at 300 K were zero due to superparamagnetism.
Publisher
World Scientific Pub Co Pte Lt
Subject
Condensed Matter Physics,Statistical and Nonlinear Physics
Cited by
3 articles.
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