Spin-Wave Excitations in Evaporated Co/Nb Multilayers

The magnetic behavior of evaporated Co/Nb multilayers has been investigated by magnetic measurements and ferromagnetic resonance (FMR). The modes of spin-wave (S-W) resonances were observed in some Co/Nb multilayers in FMR measurements. So, the S-Ws were sustained by the whole layers and propagated through the Nb layers. The dependence of the mode number n on the resonance field H res is following the n 2 law. As a result, the interlayer coupling constant ( J I ) was determined. A S-W theory has been applied to explain the variation of the magnetization versus temperature and hence to estimate the approximate values of the bulk exchange interaction ( J b ) and interface exchange interaction ( J int ) for various Co/Nb multilayers.