Magnetic Domain Pattern and Magnetocrystalline Anisotropy in Epitaxially Grown Thin Films of Fe, Ni, and Ni-Fe Alloys
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Crystal grains and domain patterns of N1-Fe alloy films which were condensed on cleaved surfaces of heated NaCl in a vacuum of 5x1O^<-5> torr were studied by transmission electron microscopy and electron diffraction. Magnetic anisotropy was also measureb by a torque magnetometer for thin films. The substrate temperature was varied between room temperature and 600℃. The films obtained range from polycrystal to nearly perfect single crystals. The degree of perfection of the crystal is classified into several types. The magnetic domain patterns and crystal anisotropies of the films depend on the composition and also on the degree of perfection of the films. Polycrystalline films are, in general, found to consist of domains of irregular shapes with curved walls and ripple structure within the domains. In good epitaxial films, however, the domains have a regular cross-hatched shape and when the films are magnetized parallel to one of the crystal anisotropy axes, the films are composed of linear domain walls almost without any ripple. Nj films, which have a large magnetostriction are apt to be influenced by internal and external stresses, which affect the domain pattern and the torque curve. Even for good epitaxial Nj films the stress induced anisotropy is of ten superior to the crystal anisotropy. The measured values of crystal anisotropy constant K_1 of good epitaxially grown films of Ni-Fe alloys agree with those of the bulk materials, but, in pure Ni and pure Fe films, they are l.5-2 times as large as the bulk values.
- 社団法人日本物理学会の論文
- 1966-02-05
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