Effect of Ar Gas Pressure on Magnetic Properties of Sputter-Deposited Fe–Cu Alloys

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Abstract
Magnetization and Mössbauer effect measurements were made for Fe1-x Cu x alloys sputter-deposited on water-cooled substrates under Ar gas pressures, P Ar, of 8.9 and 0.23 Pa. The scanning electron micrograph (SEM) shows a columnar structure for P Ar=8.9 Pa and a fibrous structure for P Ar = 0.23 Pa. A perpendicular magnetic anisotropy is observed and the coercive force, H c, is large for P Ar = 8.9 Pa, while an in-plane magnetic anisotropy is observed and H c is small for P Ar =0.23 Pa. The magnetization and average hyperfine field for P Ar = 8.9 Pa are smaller than those for P Ar = 0.23 Pa. These differences can be ascribed to the presence of CuFeO2, which is detected in the paramagnetic Mössbauer spectra in the Cu rich alloys formed under P Ar = 8.9 Pa.

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