Abstract
The first and second order uniaxial magnetic anisotropy, Ku1 and Ku2, and the saturation magnetization, Ms, of (Co 100-XMX)100-YPtY perpendicular thin films were examined, in order to improve the magnetic properties of CoCrPt-SiO2 media by replacing Cr with M. Fourteen kinds of M elements were examined, but we mainly focus on films with M = Cr, Mo, Ru, W and Re in this paper, since the other elements significantly reduced Ku1, Ku2 or the Ku /Ms ratio. The use of the M elements, instead of Cr, did not result in any significant increase in the values of Ku1, Ku2, and the Ku/Ms ratio. On the other hand, Ku1 and Ku2 of CoPt binary films had a greater dependence on the seed layer materials used (Ru, Pd, Re, Pt, Au, Ir and Cu). The c/a ratio of the hcp-CoPt lattice varied significantly with the seed layer materials used probably due to the epitaxial growth of CoPt. K u1 decreased and Ku2 increased as the c/a ratio increased. The use of specific seed layer materials was more effective at controlling the magnetic anisotropy of CoPt based perpendicular thin films, rather than the addition of M element to the CoPt.
Original language | English |
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Pages (from-to) | 2106-2108 |
Number of pages | 3 |
Journal | IEEE Transactions on Magnetics |
Volume | 43 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2007 Jun |
Keywords
- C/a ratio
- CopT based ternary alloy perpendicular films
- Perpendicular recording media
- Saturation magnetization
- Seed layers
- Uniaxial magnetic anisotropy energy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering