Ferromagnetic resonance and x-ray diffraction investigations of ion irradiated Ag/Fe/Ag-(001)-films

High fluence implantation of 95-keV Fe-ion in epitaxial Ag/Fe 200 Angstrom/Ag-(001)-multilayers were performed to induce structural modifications. The correlation between structural quality and magnetic properties was investigated by measurements with ferromagnetic resonance (FMR) and out-of-plane x-ray-diffraction techniques (XRD). The FMR results show for fluences up to 10(15) cm(-2) a decrease of the crystalline- and perpendicular-uniaxial anisotropies, which are cm attributed to strain relaxation due to the ion-irradiation detected with XRD. From these results the magnetoelastic coefficient B-1 is determined to -3 x 10(6) J/m(3). At higher fluences of 10(16) cm(-2) we observe a strong reduction of the perpendicular-uniaxial anisotropy and a change of the crystalline anisotropy from cubic towards that of a tetragonal symmetry. Further, increasing fluences lead to a lattice widening above the Fe-bulk value and an increase of the interface roughness. (C) 1997 American Institute of Physics.