Effect of oxygen on the Mn-Co ferromagnetic coupling
Identifieur interne : 000210 ( PascalFrancis/Checkpoint ); précédent : 000209; suivant : 000211Effect of oxygen on the Mn-Co ferromagnetic coupling
Auteurs : Stepan Pick [République tchèque] ; Claude Demangeat [France]Source :
- Catalysis today [ 0920-5861 ] ; 2004.
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Abstract
The paper describes the study of the effect of oxidation on the magnetic coupling between Mn and Co atoms in ultrathin Mn films deposited on fcc Co(0 0 1). The magnetic map has been investigated through tight-binding linear-muffin-tin scheme within generalized gradient approximation of the density functional. The calculations indicate that oxygen tends to destabilize the ferromagnetic Mn-Co coupling in favour of an antiferromagnetic coupling found by experiment when oxygen is added. Nevertheless, the (1 x 1) structures observed do not seem to be the most stable ones. We speculate that a disordered oxidized Mn-rich MnCo surface alloy might explain the experimental findings.
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The magnetic map has been investigated through tight-binding linear-muffin-tin scheme within generalized gradient approximation of the density functional. The calculations indicate that oxygen tends to destabilize the ferromagnetic Mn-Co coupling in favour of an antiferromagnetic coupling found by experiment when oxygen is added. Nevertheless, the (1 x 1) structures observed do not seem to be the most stable ones. 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