Proximity effects on the magnetic behavior of Cr6-Cr9 atomic clusters embedded in Fe Bulk
The magnetic behavior of clusters Cr6-Cr9 in bulk Fe is determined by using an electronic Hamiltonian which includes s, p and d electrons. The spin density distribution is calculated self-consistenly in the unrestricted Hartree-Fock approximation. The local magnetic moments μ (i) are obtained at various atoms i of Cr clusters and of the surrounding matrix. The local magnetic moments at Fe atoms and the magnetic moments of Cr atoms present an antiparallel coupling. The magnetic behavior of Cr clusters depends on two factors, the size of the cluster and the proximity between them. For Cr6 the magnetic moments at Cr atoms are parallel whereas for Cr9 the μCr(i) are antiparallel. The magnetic order in the matrix is not broken by the presence of the Cr atoms, but the local magnetic moments of Fe atoms in the interface cluster-matrix are reduced respect to Fe bulk magnetization. [v.g. μFe(5')=2μB in Cr6; μFe(3)=1.8μB in Cr9].
| Main Authors: | , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.
2007
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1665-35212007000100002 |
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