Abstract
The process of 90° pulsed magnetization is proposed to be used to measure the effective field of biaxial anisotropy HK2. The method has been developed as applied to ferrite-garnet films with a magnetization lying in their plane and is based on the determination of threshold field Hm0, at which magnetization is fully effected by rotation of magnetization vector M. The analysis performed in this study has shown that HK2 = 4(Hm0cosϕ* − H0sinϕ*)/sin4ϕ*, where H0 is the setting field determining the initial direction of vector M along one of the easy magnetization axes, and ϕ* is the critical angle of the initial rotation of vector M reached in field Hm0, beginning with which the magnetization rotation is not decelerated by anisotropy forces. It is shown that, for typical values of HK2, ϕ* ≅ 26°. The threshold field is determined from a kink in the dependence of the initial-peak amplitude in the longitudinal signal of 90° magnetization on the amplitude of magnetizing field Hm. For homogeneous films, the measurement accuracy of the effective field of biaxial anisotropy ensured in this method is no worse than 5–6%.
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