We have investigated the magnetic damping in two types of multilayer films, Cu(10 nm)/Ni 80 Fe 20 (3 nm)/Cu (d Cu) and Cu(10 nm)/Ni 80 Fe 20 (3 nm)/Cu(d Cu)/Pt(2 nm). Temperature dependence of the damping parameter and FMR linewidth with various Cu thickness d Cu were measured. Spin diffusion length increased with decreasing temperature. We also measured the temperature dependence of FMR linewidth for the Cu/ Ni 80 Fe 20 /Cu(d Cu)/Pt films with d Cu = 400 nm, 800 nm. The increase of FMR linewidth with decreasing temperature suggested that the damping increased by spin diffusion in Cu layer.
We investigated magnetic damping parameters ( ) in Co-Fe-B alloy thin films having various compositions, thicknesses, and annealing temperatures. Ferromagnetic resonance (FMR) was used to determine values. The out-of-plane angular dependencies of the resonance field and the line width of FMR spectra were measured and analyzed by using the Landau-Lifshitz-Gilbert equation, taking the effect of magnetic inhomogeneities in the films into consideration. The Co-Fe-B films with an fcc structure phase had a larger value than that of the film with a bcc structure. The damping parameter of the Co-Fe-B film was increased by increasing the B concentration and annealing temperature, and the very thin Co-Fe-B film ( 2 nm) had a large damping parameter. We discuss the advantages of Co-Fe-B thin film as a material for current-induced magnetization switching (CIMS) systems.
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