Magnetic interactions in Co-based alloy thin films

The interactions in ternary and quaternary Co-based alloy thin films for longitudinal recording media, with different thickness, are studied. The analysis is performed through the measurement of the initial magnetization and ordinary hysteresis curves. The interactions result stronger in quaternary than in ternary alloy films and when the film thickness is smaller. These findings are discussed in relationship with the evolution of the magnetic switching, characterized by a tendency towards a more coherent rotation of the magnetization in single-domain grains of thinnest and quaternary films, owing to the complex structure of these films. The impact of this evolution on the thermal stability of the magnetic properties is also discussed

Thermal relaxation of the magnetic properties in hard disk recording media

The thermal relaxation of the magnetic properties of thin films for hard disk media is studied. The analysed magnetic layers are constituted of ternary and quaternary Co-based alloy with different thickness. The relaxation is analysed with measurement of magnetic viscosity and of coercive field variability. The magnetization switching of the magnetic films is also discussed with the rotational hysteresis analysis. The different stability in the films is discussed with the evolution of the basic processes of magnetization

Analysis of the magnetic anisotropy in advanced metal particles for recording media

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Exchange anisotropy in Metal-Evaporated tapes

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Thermal relaxation of the magnetization in recording media

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Comparison between different mothods for evaluating the anisotropy field distribution in recording media

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Evolution from soft to hard magnetic bahaviour in Co-based devetrified glassy alloy

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Time effects in exchange anisotropy-affected metal-evaporated tapes

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Intrinsic magnetic behavior of single and multilayered metal-evaporated films

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