X-ray diffraction, magnetization and Mössbauer effect investigations have been performed for the sputtered Fe_0.2Cu_0.8 thin films. A segregation forming isolated body-centred cubic Fe grains in the face-centred cubic Cu matrix with an average diameter between 1 and 40 nm took place upon annealing in the temperature range from 100 to 500°C. In addition, the magnetic coercive field is found to be enhanced and reaches a value of 37 mT for the sample annealed at 400°C. A perpendicular surface anisotropy constant K_S = 0.04 mJ m^-2 is deduced. Surface spin configurations are discussed for the granular films investigated.

Duc N.H., Tuan N.A., Fnidiki A., Dorien C., Teillet J., Ben Youssef J., Le Gall H.

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Từ khóa : Annealing; Coercive force; Energy dispersive spectroscopy; Grain size and shape; Granular materials; Magnetic anisotropy; Magnetic field effects; Magnetization; Sputter deposition; Thin films; X ray diffraction analysis; Mossbauer effects; Surface spin configurations; Iron compounds