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Impact of bond-order loss on surface and nanosolid magnetism
Sun Changqing * #
Nanyang Technological University
*Correspondence author
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Funding: none
Opened online:23 June 2005
Accepted by: none
Citation: Sun Changqing.Impact of bond-order loss on surface and nanosolid magnetism[OL]. [23 June 2005] http://en.paper.edu.cn/en_releasepaper/content/2263
 
 
Incorporating the recent bond order-length-strength correlation mechanism [Sun et al., Acta Mater 2004;52:501] into the Ising convention and the Brillouin function has enabled the unusual magnetic behavior of a ferromagnetic nanosolid and a surface to be reproduced using Monte Carlo simulations. Examination of the size and temperature dependence of the saturation magnetization (MS) of a solid of various structures reveals that: (i) at low temperatures, the MS increases inversely with solid size due to the contribution from the localized charges that are trapped by the deepened potential well of the lower-coordinated atoms in the surface skins, (ii) at the ambient temperatures, the MS drops with solid size because of the bond order loss that suppresses the Curie temperature of the specimen, and (iii) the quantized features of the surface to volume ratio of the solid is responsible for the observed MS oscillations of smaller clusters at low temperatures.
Keywords:Nanostructures; magnetism; thermal stability
 
 
 

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