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Quantum analytical theory for giant magnetoresistance in magnetic multilayered film systems

✍ Scribed by Z.C. Dong

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
112 KB
Volume
256
Category
Article
ISSN
0375-9601

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✦ Synopsis

Taking into account the quantum size effects and considering three types of scattering from bulk impurities, rough surfaces, and rough interfaces, we use the quantum-statistical Green's function approach and Kubo theory to calculate the Ž . giant magnetoresistance GMR in magnetic multilayered structures. Our calculation can reproduce the main features of GMR experiments, including the oscillations of GMR with nonmagnetic thickness, and the GMR increases with increasing Ž . number of bilayers N of the FerCr rFe system and others. As well, the question whether or not the scattering rates due to N the impurities, surfaces, and interfaces add up is also addressed to.

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We present a quantum-statistical theory using the Kubo formalism to describe both CIP (current in plane) and CPP (current perpendicular to the plane) giant magnetoresistance (GMR) of thin magnetic sandwiches. It is shown that GMR for both geometries oscillates with the thicknesses of the sandwich's