Effect of Pt on the Intergranular Exchange Coupling in CoCrTaPt Thin Film Media Prepared under Ultra Clean Sputtering Process

M. Takahashi; H. Hara; A. Kikuchi; S. Yoshimura; H. Shoji

doi:10.3379/jmsjmag.23.335

Chapter 5. Recording Media

Effect of Pt on the Intergranular Exchange Coupling in CoCrTaPt Thin Film Media Prepared under Ultra Clean Sputtering Process

M. Takahashi, H. Hara, A. Kikuchi, S. Yoshimura, H. Shoji

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Keywords: coercive force, magnetocrystalline anisotropy field of the grains, intergranular magnetostatic coupling, intergranular exchange coupling, Cr segregated grain boundary

JOURNAL OPEN ACCESS

1999 Volume 23 Issue 1_2 Pages 335-337

DOI https://doi.org/10.3379/jmsjmag.23.335

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Abstract

The effect of Pt addition on magnetic properties for CoCrTaPt media with extremely thin Cr underlayer of 2.5 nm fabricated under ultra clean sputtering process are connected with the magnetic anisotropy field of grains, the microsturucture, and intergranular magnetic coupling. As a results, (1)Pt addition more than 8 at% decreases the magnetrocrystalline anisotropy field of the grains. (2)Pt addition more than 8 at% disturbs a formation of Cr segregated rain boundary structure, inducing intergranular exchange coupling. (3) The upper limit of Pt addition is proposed to be 5-6 at%.

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