Design of laminated antiferromagnetically coupled media for beyond 100 Gb/in 2 areal density

J. P. Wang, S. N. Piramanayagam, C. H. Hee, L. Huang, S. I. Pang, S. K. Chow, X. Shi, T. C. Chong

Research output: Contribution to journalArticlepeer-review

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Abstract

In this report, we will present our experimental and micromagnetic simulation studies to show that laminated antiferromagnetically coupled media has potentials to push the areal density beyond 100 Gbit/in 2. Exchange coupling constant as high as 0.32 erg/cm 2 has been obtained for basic two layer configuration by inserting an ultrathin Co interface layer between CoCrPtB and Ru layers, which is 3-4 times higher than the reported values in literature. This technique improved the thermal stability factor by more than 40%. A type of sandwich three-layer configuration for the antiferromagnetic coupled media is proposed which may double the antiferromagnetic coupling effect for the recording CoCrPtB layer. It also can further reduce the M rt value (less than 0.2 memu/cm 2) while keeping high thermal stability that may be preferred for future application once extreme high sensitivity read head appears.

Original languageEnglish (US)
Pages (from-to)7694-7696
Number of pages3
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
StatePublished - May 15 2002

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