TY - JOUR
T1 - Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films deposited on various seed layer materials
AU - Sato, Hideo
AU - Shimatsu, T.
AU - Okazaki, Y.
AU - Kitakami, Osamu
AU - Okamoto, S.
AU - Aoi, H.
AU - Muraoka,
AU - Nakamura, Y.
N1 - Funding Information:
This work was supported in part by the IT Program of MEXT.
PY - 2007/6
Y1 - 2007/6
N2 - 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.
AB - 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.
KW - C/a ratio
KW - CopT based ternary alloy perpendicular films
KW - Perpendicular recording media
KW - Saturation magnetization
KW - Seed layers
KW - Uniaxial magnetic anisotropy energy
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U2 - 10.1109/TMAG.2007.892540
DO - 10.1109/TMAG.2007.892540
M3 - Article
AN - SCOPUS:34249060887
SN - 0018-9464
VL - 43
SP - 2106
EP - 2108
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 6
ER -