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Microstructure and Exchange Coupling of Segregated Oxide Perpendicular Recording Media

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7 Author(s)
Nolan, T.P. ; Seagate Technol., Fremont, CA ; Risner, J.D. ; Harkness, S.D. ; Girt, E.
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The magnetic properties and corresponding microstructure of (Co 80Pt20)x (metal oxide)1-x perpendicular recording media have been studied as a function of the volume percentage (vol%) of metal oxide sputtering into the magnetic film. The exchange coupling field (Hex) estimated from the coercivity (H c) and nucleation field (Hn) decreases rapidly between 0-20 vol% of metal oxide. The analytical transmission electron microscope composition analysis of (Co80Pt20)x(TiO2)1-x media confirms that the microstructure includes crystalline grain cores in an apparently amorphous oxide matrix. The grain cores comprise only Co and Pt in a nearly constant ratio independent of the vol% of oxide addition. The amorphous matrix contains Co, Ti, and O, but no Pt. The Co concentration is nearly constant in grain boundary and core regions, unlike high-temperature longitudinal recording media wherein Co segregates to form a concentration gradient in the grain core. Perpendicular media thus maintain fairly high anisotropy of the grain core phase, even for very high-oxide concentrations that significantly decrease remanant magnetization (Mrt), Hc, and thermal stability (KuV/kT)

Published in:

Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 2 )

Date of Publication:

Feb. 2007

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