Spin fluctuations in coupled two-dimensional magnetic trilayers

Magnetic trilayer systems consisting of two ultrathin ferromagnetic films of Co and Ni separated by a non‐magnetic spacer of Cu are investigated in order to analyze the effect of spin fluctuations in the ultrathin film limit (2D). The element specificity of the X‐ray magnetic circular dichroism tech...

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Bibliographic Details
Published in:Physica Status Solidi (b) 2006-01, Vol.243 (1), p.165-168
Main Authors: Wende, H., Sorg, C., Bernien, M., Scherz, A., Jensen, P. J., Ponpandian, N., Baberschke, K.
Format: Article
Language:English
Subjects:
75.10.Dg
75.70.Cn
78.70.Dm
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
FLUCTUATIONS
Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures)
LAYERS
MAGNETIC MATERIALS
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetic properties of surface, thin films and multilayers
MATERIALS SCIENCE
Other,OTHER
Physics
SPIN
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Summary:Magnetic trilayer systems consisting of two ultrathin ferromagnetic films of Co and Ni separated by a non‐magnetic spacer of Cu are investigated in order to analyze the effect of spin fluctuations in the ultrathin film limit (2D). The element specificity of the X‐ray magnetic circular dichroism technique is applied to study the temperature dependence of the Co and Ni magnetization separately. The effect of (i) the interlayer exchange coupling and (ii) the enhanced 2D spin fluctuations on the shift of the critical temperature of the Ni films is determined by varying both the Cu and the Ni thicknesses. For a detailed understanding of these effects the experimental results are compared to a microscopic many‐body Green's function theory. Both experiment and theory provide clear indications that for nanostructured magnets a static mean field description is insufficient. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200562408