Abstract
Films with a nominal composition of Tb(Fe0.55Co0.45)1.5 werefabricated by rf-magnetron sputtering from a fixed target configuration atvarious Ar gas pressures. Samples were investigated by means of x-raydiffraction (XRD), scanning electron microscopy (SEM), vibrating samplemagnetometer (VSM), conversion electron Mössbauer spectra (CEMS) andmagnetostriction measurements. As the Ar pressure increases, the Tb and Fecontent increases slightly, whereas the Co content decreases. In addition, asmall amount of Ar is introduced into the films. The as-deposited films areamorphous alloys, but their magnetic behaviour depends strongly on thedeposition conditions: a perpendicular magnetic anisotropy is obtained only infilm deposited at lowest Ar pressure and a parallel magnetic anisotropyexhibits in remaining films. These samples show an intrinsic magnetostriction(λ≈10-3) in an applied field of 0.7 T. In this state, it wasdetermined that the hyperfine field reaches the value Bhf = 24.5 T. Effectsof the heat treatment on the magnetostrictive softness are also reported. Theparallel magnetostriction with a huge magnetostrictive susceptibility(χλ = 1.8×10-2 T-1) obtained at (µ0H = 10 mT)makes these materials useful for applications.
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