The ferromagnetic moment of an antiferromagnetic domain wall

We present a theoretical study of an Fe/Cr multilayer film which may be thought of as a synthetic antiferromagnetic superlattice. We clarify certain aspects of the surface-spin-flop transition in which a domain wall nucleates at the outer layer and eventually migrates to the centre with increasing bias field. In particular, the nonvanishing ferromagnetic moment predicted earlier for bulk domain walls at vanishing field is shown to drive a prolonged hysteresis cycle and could thus be detected experimentally.