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Magnetic Anisotropy of Co-M-Pt ( {\rm M}={\rm Cr} , Mo, Ru, W, Re) Perpendicular Films Deposited on Various Seed Layer Materials

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8 Author(s)
Sato, H. ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai ; Shimatsu, T. ; Okazaki, Y. ; Kitakami, O.
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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 K u2 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. Ku1 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

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )