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Co-Pt-TiO/sub 2/ composite film for perpendicular magnetic recording medium | IEEE Journals & Magazine | IEEE Xplore

Co-Pt-TiO/sub 2/ composite film for perpendicular magnetic recording medium


Abstract:

A new type of oxide composite film was proposed as perpendicular magnetic recording medium. The storage layer is composed of Co-Pt and Ti-oxide. By transmission electron ...Show More

Abstract:

A new type of oxide composite film was proposed as perpendicular magnetic recording medium. The storage layer is composed of Co-Pt and Ti-oxide. By transmission electron microscopy (TEM) observation, the film exhibited a well isolated fine granular structure with small and uniform Co-Pt grains surrounded by TiO/sub 2/. More sufficient segregation by TiO/sub 2/ was realized from the beginning of the layer growth compared with other oxide addition film, resulting in a magnetically weak coupled structure. This film has a relatively large magnetic anisotropy constant (K/sub u/) and saturation magnetization (M/sub s/) of more than 5/spl times/10/sup 6/ erg/cm/sup 3/ and about 800 emu/cm/sup 3/, respectively. The structure was brought about by a high sputtering gas pressure of Co-Pt-TiO/sub 2/ film deposition.
Published in: IEEE Transactions on Magnetics ( Volume: 41, Issue: 10, October 2005)
Page(s): 3142 - 3144
Date of Publication: 17 October 2005

ISSN Information:


I. Introduction

Perpendicular magnetic recording has been studied for more than 20 years [1] and announced to come onto the hard disk drive (HDD) market by the middle of this year. In perpendicular recording medium, a Co-Pt-Cr-SiO granular film has been studied for the application [2]. This material forms a very distinct segregated structure which consists of very fine crystal grains of Co-Pt-Cr with relatively large magnetic anisotropy constant surrounded by grain boundaries of SiO . However, a larger magnetic anisotropy is required for obtaining a higher recording density toward 1 Tbit/in with sufficient thermal stability. A large is also needed for reducing required perpendicular coercivity, , [3], so as to keep thermal stability and a large output signal.

References

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