Dependence of saturation magnetization and coercivity of Co-Cr/Al multilayered films on Co-Cr layer thickness

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Abstract
Co81Cr19/Al multilayered films with thicknesses of Co81Cr19 layers in the range of 46–170 Å and Al ones of 7 Å have been prepared on glass‐slide substrate at room temperature by using the facing targets sputtering (FTS) apparatus. The dependence of the magnetic and crystallographic characteristics on the thickness of Co‐Cr layers have been investigated. The magnetoresistanceeffect of the specimen films have been also examined. The intrinsic Co81Cr19 layers were composed of hcp phase crystallites with well orientation of the c axis normal to the film plane. Both the crystallinity of Co81Cr19 layers was improved and the d spacing between the c planes was expanded by using the Al interlayers as ultrathin as 7 Å. The easy direction of magnetization in the films was perpendicular to the film plane. The saturation magnetization, the coercivity, the in‐plane squareness ratio and the anisotropy field depended strongly on the thickness of Co81Cr19 layer. On the other hand, the magnetoresistivity ratio was negative and its absolute value was as small as 0.13%.

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