A study of the electromagnetic response of superconductor/ferromagnet Nb∕Co superlattices is presented. The dc magnetization is measured as a function of Co layer thickness, applied field Hₐ, and temperature. For very thin Co layers, no ferromagnetism is detected and the observed response is essentially that of a collection of uncoupled Nb layers. When the Co layer is thick enough for ferromagnetism to be established, prior to the field-cooled magnetization measurements, the Co layers are magnetically saturated in the parallel or antiparallel directions to Hₐ. In this case, the magnetic response of the otherwise uncoupled Nb layers is found to depend on both Hₐ and the stray fields.
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Monton et al. (2007) studied this question.
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