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Interfacial Co nanolayers for enhancing interlayer exchange coupling in antiferromagnetic interlayer exchange coupling media

Significant enhancement of the interlayer coupling strength has been achieved by depositing Co nanolayers on both sides of the Ru layer in a conventional CoCrPt/Ru/CoCrPt antiferromagnetic interlayer exchange coupling structure. The interlayer coupling increases nearly linearly from 0.13 to 0.8 erg/cm2 and then levels off with an increase in Co thickness. Substrate bias was found to be very harmful to the exchange coupling. The texture, structure and the growth of the grains and the crystal lattices were also studied with an x-ray diffractometer and a transmission electron microscope.