Discontinuous Co layer in Co/Cu multilayers at the first antiferromagnetic maximum

Abstract 59 Co NMR spectroscopy was used to study the structure of [Co( t Co )/Cu(9 A)] 20 multilayers with 4 A ⩽ t Co ⩽ 13 A. Between 4 and 10 A, Co is found to form discontinuous islands embedded in the alloy-like CoCu mixture, similarly to the structure reported previously for [Co( t Co )/Cu(20 A)] 20 multilayers. However, the restoring field is significantly different for samples with t Cu = 9 A from that in samples with t Cu = 20 A.