| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1641 - C8-1642 | |
| DOI | https://doi.org/10.1051/jphyscol:19888750 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1641-C8-1642
DOI: 10.1051/jphyscol:19888750
Department of Mathematics, City University, Northampton Sq. London EC1V 0HB, G.B.
J. Phys. Colloques 49 (1988) C8-1641-C8-1642
DOI: 10.1051/jphyscol:19888750
ANTIFERROMAGNETIC COUPLING OF SURFACE LOCAL MOMENT TO A STRONGLY FERROMAGNETIC SUBSTRATE
M. Afsharnaderi et J. MathonDepartment of Mathematics, City University, Northampton Sq. London EC1V 0HB, G.B.
Abstract
The exchange coupling J⊥ of a surface local moment to a strongly ferromagnetic surface is calculated in RPA using a tight binding model. J⊥ is shown to decrease rapidly with increasing impurity occupancy ni and there is a critical ni for which J⊥ becomes antiferromagnetic. The model is used to discuss Bergmann's measurements for Fe and Ni impurities on Pd and the observed weakening of exchange for Fe on the surface of FeNiB0.5 glass.