Behaviour of strip domains with finite wall width in uniaxial magnetic films

Calculations of the anhysteretic magnetic behaviour of uniaxial domain arrays have hitherto treated the domain walls as laminar structures of constant energy density. A more general expression for the free energy of a strip domain array is derived, which includes the asymptotic wall width as a floating parameter. This is used to indicate the variation of the wall width with film thickness and material parameters and to investigate effects in specimens with low anisotropy fields.