Effects of Strain, Preferred Orientation, and Local Crystallite Size Variation on Néel and Cross-Tie Domain Walls

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Abstract
The effects on shape and coercive force, Hc, of Néel and cross‐tie domain walls due to variation in crystallite size, strain, and preferred orientation have been studied. Experiments were designed to try to separate the different effects in order to better understand their respective contribution to domain wall motion. The breaking or joining of domain walls during motion has been shown to be caused either by crystallite size variation greater than 50 Å, or by local areas of preferred orientation plus strain. In order to assess the effects of strain or preferred orientation in these films, it is imperative to eliminate crystallite size effects. Once this is done, anisotropy terms are used to describe the experimental results. A crystallite size variation of 200 Å is shown to make a difference of 0.9 Oe in Hc. Preferred orientation plus strain in our films has been shown to reduce Hc by 2.6 Oe. The possible effects of intrinsic and extrinsic stacking faults are indicated.

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