Gyromagnetic ratio and magnetization in Fe/V superlattices

The g-factor, the intrinsic magnetic anisotropy energy (MAE) and the magnet ization are determined from high-precision multi-frequency ferromagnetic re sonance measurements and SQUID magnetometry: In Fe-2/V-5 and Fe-4/V-4 bcc(1 00) superlattices we find different reduced magnetic moments per Fe atom of 1.14 mu(B) and 1.5 mu(B) assuming theoretically calculated V moments of -0 .67 mu(B) and -0.35 mu(B) at the interface planes of the two samples. Incre ased values of the spectroscopic splitting g-factor with respect go bulk Fe are measured. By comparison with theoretical calculations, with the measur ed MAE and with previous experiments, we conclude that the larger g-values are most likely due to the ferrimagnetic response of the exchange coupled F e/V layers and not to an enhanced orbital moment in Fe. In addition, we iin d evidence that the induced magnetic moment, of the V atom persists above t he Curie temperature in the paramagnetic regime.