Coercivity tuning in Co/Pd multilayer based bit patterned media

Hellwig, O.; Hauet, T.; Thomson, T.; Dobisz, E.; Risner-Jamtgaard, J. D.; Yaney, D.; Terris, B. D.; Fullerton, E. E.
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p232505
Academic Journal
In order to adjust the reversal field of high anisotropy [Co(2.8 Å)/Pd(9 Å)]8 bit patterned media (BPM), one may increase the individual Co thickness to change the overall anisotropy or alternatively combine the high anisotropy multilayer with a lower anisotropy material, thus creating a heterogeneous laminated system. In the current study, we find that [Co/Pd]8-N[Co/Ni]N hard-soft laminated BPM allows tuning the coercivity while maintaining a narrow normalized switching field distribution (σSFD/HC), whereas homogeneous structures with increased individual Co thickness show a more pronounced increase in σSFD/HC. Possible reasons for the different behavior, such as changes in strain and texture, are discussed.


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