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We investigate the effect of Al doping on the magnetic properties of thealloy CoFeB. Comparative measurements of the saturation magnetization, theGilbert damping parameter $\alpha$ and the exchange constant as a function ofthe annealing temperature for CoFeB and CoFeAlB thin films are presented. Ourresults reveal a strong reduction of the magnetization for CoFeAlB incomparison to CoFeB. If the prepared CoFeAlB films are amorphous, the dampingparameter $\alpha$ is unaffected by the Al doping in comparison to the CoFeBalloy. In contrast, in the case of a crystalline CoFeAlB film, $\alpha$ isfound to be reduced. Furthermore, the x-ray characterization and the evolutionof the exchange constant with the annealing temperature indicate a similarcrystallization process in both alloys. The data proves the suitability ofCoFeAlB for spin torque switching properties where a reduction of the switchingcurrent in comparison with CoFeB is expected.

CoFeAlB alloy with low damping and low magnetization for spin transfer torque switching