抄録
A ferromagnetic resonance spectrometer which enable the measurement for a film evaporated in ultra-high vacuum (UHV) prior to the exposure to air has been constructed. Nickel films made in UHV have much less magnetic perpendicular anisotropy field Hk (which is in the equation for resonance condition ω⁄γ=H⊥−4πM+Hk in the perpendicular direction of the applied field to the film plane, where H⊥ is the observed resonance field), about 3∼5×102 Oe, than those made in conventional vacuum by a factor of 6∼10. The absorption of residual gases causes Hk to become larger. Study on double-layer films, composed of two nickel films with an absorbed gas layer at their interface, results the different perpendicular anisotropy fields for each nickel film, one, in contact with the glass substrate, with smaller Hk than the other, besides the aging in UHV makes values shift in the contrary way for each film, like approaching to each other. Some qualitative explanations are given.
