TITLE

Quantum confinement effect on the vacancy-induced spin polarization in carbon, silicon, and germanium nanoparticles: Density functional analysis

AUTHOR(S)
Zhenkui Zhang; Ying Dai; Baibiao Huang; Myung-Hwan Whangbo
PUB. DATE
February 2010
SOURCE
Applied Physics Letters;2/8/2010, Vol. 96 Issue 6, p062505
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Density functional calculations were carried out to examine the vacancy-induced spin polarization in diamond, silicon, and germanium nanoparticles and the magnetic coupling between the vacancy-induced defect states in those nanoparticles. Our calculations show that the vacancy-induced defect states are spin-polarized in diamond nanoparticles regardless of their size but this happens in silicon and germanium nanoparticles only when their size is small, which is in reasonable agreement with the experimentally observed magnetic behaviors. The vacancy-induced defect states on adjacent vacancies prefer to couple ferromagnetically in C nanoparticles but antiferromagnetically in Si and Ge nanoparticles.
ACCESSION #
48067905

 

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