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Study on the Interfacial Characterization of the Co5/Cu3/Co5 trilayer and Co3/Cu/Co/Cu3/Co/Cu/Co3 Multilayer

Published online by Cambridge University Press:  03 March 2011

Xiaoyu Yuan ,
Xiaofang Bi ,
Jiaxiang Shang  and
Huibin Xu
Xiaoyu Yuan
Affiliation:
Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Xiaofang Bi*
Affiliation:
Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Jiaxiang Shang
Affiliation:
Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Huibin Xu
Affiliation:
Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Comprehensive results are presented on the influence of interfaces on electronic structure and giant magnetoresistance (GMR). Two structures were calculated for Co5/Cu3/Co5 and Co3/Cu/Co/Cu3/Co/Cu/Co3, where numbers stand for monolayer numbers of atoms, by employing the discrete variational method in the framework of the local spin density approximation. It has been found that the electron spin-dependent scattering is very strong at the interfaces compared to the interiors of the ferromagnetic layers, independent of the moment alignment configuration. The calculation results of total energy for various magnetization configuration revealed that antiferromagnetic exchange coupling was present between any of the ferromagnetic layers separated by Cu layers at zero field in the Co3/Cu/Co/Cu3/Co/Cu/Co3. The evaluated GMR ratio for the Co3/Cu/Co/Cu3/Co/Cu/Co3 (about 35.1%) was much larger than that of the Co5/Cu3/Co5 (about 21.0%), indicating large GMR effect could be expected with more interfaces when the thicknesses were the same. The result also indicated that the negative polarization of 4s electrons could reduce the GMR effect.

Keywords

ab initio calculationElectronic structureMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 741 - 745
Copyright
Copyright © Materials Research Society 2004

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References

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