Effect of rare-earth doping on magnetic softness and magnetization dynamics of Fe-Ga films

This paper reports the influence of rare-earth (RE) doping on static and dynamic magnetic properties of 50-nm-thick Fe-Ga films grown on a glass substrate. With the addition of RE elements, the magnetic softness of Fe-Ga films improved at higher RE content, which might be attributed to the induction of in-plane uniaxial anisotropy by RE doping. As for the dynamic properties of Fe-Ga-RE films, an overall increased effective in-plane damping constant (α//,eff) were observed as the increase of RE content, except for a decreased α//,eff from 0.0228 to 0.0151 at low RE contents. These results suggest that the addition of RE could induce tunable magnetic properties in Fe-Ga films, making resultant Fe-Ga-RE films as one of the promising candidates for the sensing applications and high frequency microwave magnetic devices.