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We study the properties of composite free layers with perpendicularanisotropy. The free layers are made of a soft FeCoB layer ferromagneticallycoupled by a variable spacer (Ta, W, Mo) to a very anisotropic [Co/Ni]multilayer embodied in a magnetic tunnel junction meant for spin torque memoryapplications. For this we use broadband ferromagnetic resonance to follow thefield dependence of the acoustical and optical excitation of the composite freelayer in both in-plane and out-of-plane applied fields. The modeling providesthe interlayer exchange coupling, the anisotropies and the damping factors. Thepopular Ta spacer are outperformed by W and even more by Mo, which combines thestrongest interlayer exchange coupling without sacrificing anisotropies,damping factors and transport properties.

Ferromagnetic resonance study of composite Co/Ni - FeCoB free layers with perpendicular anisotropy