Magnetic Properties of Anomalous Nickel Thin Films

概要

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Torque curves are observed for anomalous Ni thin films of various thickness to clarify the origin of perpendicular anisotropy in connection with the formation mechanism of evaporated thin films. The observed torque curves are compared with the curves calculated with the assumption of the stripe domain structure. A large perpendicular anisotropy is introduced when islands grains coalesce each other, whereas the contamination by air reduces the anisotropy. The Ni film deposited on grease has also a large perpendicular anisotropy. There are some essential discrepancies between observed torque curves and calculated ones, which mean that the experimental facts can not be explained simply by the perpendicular anisotropy resulted from both the magnetostrictive and magnetostatic anisotropies. A reasonable explanation can be given if the magnetization is assumed to be pinned down at a certain interval region by some effects like ferro-antiferro interaction. The preparation conditions of these films favour this assumption.
社団法人日本物理学会の論文
1967-08-05