Interlayer coupling of Co/Pb multilayers was studied by magnetization and M
agnetoresistance (MR) measurements and ferromagnetic-resonance (FMR). The P
b layer thickness dependence of coupling strength derived from the separati
on between the resonance fields of the 'optical mode' and uniform mode in p
erpendicular FMR spectra is consistent qualitatively with the variation of
the in-plane remanence ratio and MR ratio with spacer thickness. (C) 1999 E
lsevier Science B.V. All rights reserved.