Abstract
We demonstrate using both structural and magnetic analyses that an antiferromagnetic MnRu intermediate layer can simultaneously increase the anisotropy constant and reduce the intergranular exchange coupling of a CoPtCr-SiO 2 recording layer. The anisotropy constant of CoPtCr-SiO 2 is increased by an exchange coupling with the adjacent antiferromagnetic MnRu intermediate layer. Additionally, the MnRu layer leads to better SiO 2 segregation within the recording layer which then weakens intergrain exchange coupling. While the enhanced grain isolation leads to a reduction in the activation volume, a potential loss in thermal stability is avoided due to the enhanced anisotropy. © 2010 The American Physical Society.