Overview of interlayer exchange theory

Basic mechanisms of interlayer exchange coupling between two ferromagnets separated by a non-magnetic spacer are surveyed. Simple generic theoretical models yielding closed formulae are treated. First, intrinsic exchange between itinerant ferromagnets is treated in the free-electron band approximati...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1995-09, Vol.150 (1), p.13-24
Main Author: Slonczewski, J.C.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Exchange and superexchange interactions
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Metals. Metallurgy
Physics
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Summary:Basic mechanisms of interlayer exchange coupling between two ferromagnets separated by a non-magnetic spacer are surveyed. Simple generic theoretical models yielding closed formulae are treated. First, intrinsic exchange between itinerant ferromagnets is treated in the free-electron band approximation, including corrections to the elementary sinusoidal dependences on metallic-spacer thickness and on angle θ included between the magnetic moments. Properties of metallic and insulating spacers are compared. Then three special mechanisms of non-cos θ coupling are described: (1) fluctuations of spacer thickness, (2) loose spins, and (3) a novel phenomenological coupling through a non-normal spacer, possibly acting in spacers composed of chromium or manganese.
ISSN:0304-8853
DOI:10.1016/0304-8853(95)00081-X