Apr, 2006
Structure and random anisotropy in single-phase Ni nanocrystals
APPLIED PHYSICS LETTERS
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- Volume
- 88
- Number
- 15
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1063/1.2188597
- Publisher
- AMER INST PHYSICS
We prepared high-purity oxygen-free and single-phase Ni nanocrystals using the gas condensation and deposition method in order to examine the random anisotropy model (RAM). The grain size of an as-prepared sample was estimated to be 8-10 nm. Thermal annealing increased grain sizes (D) up to 22 nm. Clear D-6 dependence of the coercive force on a grain size smaller than 13 nm was obtained for samples prepared on both plastic and KBr single-crystal substrates. For larger grain sizes, H-c decreased with D-1 and these results clearly conform to the RAM in single-element nanocrystal systems. A local anisotropy constant was estimated from the slope of the D-6 relation and the peak of H-c at D=13 nm. (c) 2006 American Institute of Physics.
- Link information
- ID information
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- DOI : 10.1063/1.2188597
- ISSN : 0003-6951
- Web of Science ID : WOS:000236796400048