The Effect of Strain on the Susceptibility of Polycrystalline Ni–Fe Films

Various ripple effects in uniaxial polycrystalline magnetic films have been related by several authors to an effective single‐grain crystalline anisotropy constant K. If either an isotropic planar stress σ or a uniaxial strain e33 is applied to such a film, the ripple properties are altered. We develop a simple model which includes the effects of such stresses and strains. We thereby evaluate K as an effective crystalline anisotropy given by K=[(K1+Bse33+¼Bσσ)2+(7/16)(Bσσ)2],1/2 where K1 is the fourth order magneto‐crystalline anisotropy constant, and B8 and Bσ are appropriate magnetoelastic coupling constants. A convenient ripple parameter is (HP‐HK), where HK is the uniaxial anisotropy field of the film and HP is the field in the hard direction at which the in‐phase component of the transverse differential susceptibility is a maximum. Measurements of (HP‐HK) vs e33 taken on electroplated cylindrical Ni–Fe films varying in thickness from 3000 A to a 10,000 A are presented. While the results are qualitati...

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