Differences of the Magnetic Behavior and Microstructure between the Co Layers in the Ni Buffered Co/Cu/Co Sandwich and Their Effects on Giant Magnetoresistance

The magnetic behaviors and the microstructures of the two Co layers in the Ni buffered Co 55 Å/Cu 35 Å/Co 55 Å sandwich were investigated by a vibrating sample magnetometer and high resolution transmission electron microscope. It was found that the structural quality of the two cobalt layers depends...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2000-05, Vol.39 (5A), p.L406
Main Authors: Li, Tie, Shen, Hong-Lie, Shen, Qin-Wo, Tang, Sheng-Ming, Zhu, Xiang-Rong, Zou, Shi-Chang
Format: Article
Language:English
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Summary:The magnetic behaviors and the microstructures of the two Co layers in the Ni buffered Co 55 Å/Cu 35 Å/Co 55 Å sandwich were investigated by a vibrating sample magnetometer and high resolution transmission electron microscope. It was found that the structural quality of the two cobalt layers depends on their different `buffer' layers. The lower cobalt layer induced by the nickel layer formed high quality face-centered cubic (fcc) structure, while the upper cobalt layer grown upon the copper matrix produced only random-oriented fcc-Co structure. The different crystalline states between the two Co layers resulted in their different magnetic behaviors through the magnetostatic effect, which made it possible to achieve a maximum anti-aligned state and finally enhanced the giant magnetoresistance (GMR) effect in the Co/Cu/Co sandwich.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.39.L406