L10 CoPt–Ta2O5 exchange coupled multilayer media for magnetic recording

Pandey, K. K. M.; Chen, J. S.; Chow, G. M.; Hu, J. F.
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p232502
Academic Journal
Exchange coupled L10 CoPt–Ta2O5 multilayer media of gradually reducing coercivity from bottom to top layer were demonstrated to reduce the coercivity of hardest layer. The coercivity of different layers was tuned by adjusting the Ta2O5 content. The coercivity of 12 nm hardest layer was reduced by factor of three using multilayer media of total thickness 20 nm. The exchange coupled media comprising 12 nm hardest layer and 8 nm softest layer was able to reduce the coercivity only by factor of two. This indicates that multilayer media is more effective to reduce the switching field than the exchange coupled media.


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