Calculated interlayer magnetic couplings in Fe/Cr superlattices
Institut de Physique et de Chimie des Matériaux de
Strasbourg (UMR 7504 du CNRS) Groupe d'Etudes des Matériaux Métalliques
23, rue du Loess, F-67037 Strasbourg Cedex, France
Accepted: 9 November 1999
We present recent calculations of the non-collinear magnetic structure in Fe/Cr superlattices having perfectly flat or “rough" interfaces. The self-consistent magnetic-moments maps and the interlayer couplings are obtained from tight binding band structure calculations allowing to study large systems. We show that the bilinear-biquadratic expression for the coupling energy fits nicely the calculated values. We model “rough" interfaces by considering atomic steps in the Cr layers and we show that a 90-degree magnetic interlayer arrangement occurs even if it is not allowed by minimising the coupling energy.
PACS: 71.20.Be – Transition metals and alloys / 75.70.-i – Magnetic films and multilayers / 75.70.Cn – Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures)
© EDP Sciences, 2000