Interlayer Exchange Coupling in Asymmetric Co−Fe/Ru/Co−Fe Trilayers Investigated with Broadband Temperature-Dependent Ferromagnetic Resonance

Interlayer exchange coupling of two ferromagnetic layers through a nonmagnetic spacer is an integral part of many magnetic sensors and devices. The authors use broadband ferromagnetic resonance to investigate the oscillatory interlayer exchange coupling between two Co-Fe layers, as a function of Ru spacer thickness and of temperature. The results show that the temperature dependence of the coupling is governed by the thermal spin-wave model---important insight for engineering magnetic and spintronic components.