Lorentz electron microscopy techniques have been applied to a study of 180° magnetic domain wall structure in a Co3.5CuFe0.5Ce1.09 permanent magnet. The asymptotic wall width δ was determined to be 94 Å, accurate to within approximately ± 30%. This leads to a wall energy of ∼ 24 erg/cm2 and an exchange constant of ∼ 1.8 × 10−6 erg/cm when the standard continuum model for the wall structure is assumed.
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Leamy et al. (1973) studied this question.
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