Magnetization in quasiperiodic magnetic multilayers with biquadratic exchange coupling

A theoretical study of the magnetization curves of quasiperiodic magnetic m ultilayers is presented. We consider structures composed by ferromagnetic f ilms (Fe) with interfilm exchange coupling provided by intervening nonferro magnetic layers (Cr). The theory is based on a realistic phenomenological m odel, which includes the following contributions to the free magnetic energ y: Zeeman, cubic anisotropy, bilinear, and biquadratic exchange energies. T he experimental parameters used here are based on experimental data recentl y reported, which contain sufficiently strong biquadratic exchange coupling . (C) 2001 American Institute of Physics.