Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films deposited on various seed layer materials

H. Sato; T. Shimatsu; Y. Okazaki; O. Kitakami; S. Okamoto; H. Aoi; Muraoka; Y. Nakamura

doi:10.1109/TMAG.2007.892540

Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films deposited on various seed layer materials

H. Sato, T. Shimatsu, Y. Okazaki, O. Kitakami, S. Okamoto, H. Aoi, Muraoka, Y. Nakamura

Research output: Contribution to journal › Article

12 Citations (Scopus)

Abstract

The first and second order uniaxial magnetic anisotropy, K_u1 and K_u2, and the saturation magnetization, M_s, of (Co _100-XM_X)_100-YPt_Y 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 K_u1, K_u2 or the K_u /M_s ratio. The use of the M elements, instead of Cr, did not result in any significant increase in the values of K_u1, K_u2, and the K_u/M_s ratio. On the other hand, K_u1 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. K _u1 decreased and K_u2 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
Pages (from-to)	2106-2108
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	43
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2007.892540
Publication status	Published - 2007 Jun 1

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

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Sato, H., Shimatsu, T., Okazaki, Y., Kitakami, O., Okamoto, S., Aoi, H., Muraoka, & Nakamura, Y. (2007). Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films deposited on various seed layer materials. IEEE Transactions on Magnetics, 43(6), 2106-2108. https://doi.org/10.1109/TMAG.2007.892540

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title = "Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films deposited on various seed layer materials",

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.",

keywords = "C/a ratio, CopT based ternary alloy perpendicular films, Perpendicular recording media, Saturation magnetization, Seed layers, Uniaxial magnetic anisotropy energy",

author = "H. Sato and T. Shimatsu and Y. Okazaki and O. Kitakami and S. Okamoto and H. Aoi and Muraoka and Y. Nakamura",

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T1 - Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films deposited on various seed layer materials

AU - Sato, H.

AU - Shimatsu, T.

AU - Okazaki, Y.

AU - Kitakami, O.

AU - Okamoto, S.

AU - Aoi, H.

AU - Muraoka,

AU - Nakamura, Y.

PY - 2007/6/1

Y1 - 2007/6/1

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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