Gyromagnetic ratio and magnetization in Fe/V superlattices

¹ Institut für Experimentalphysik, Freie Universität Berlin Arnimallee 14, D-14195 Berlin-Dahlem, Germany
² Hahn-Meitner-Institut Berlin - Glienicker Str. 100, 14109 Berlin, Germany

Received: 30 September 1999
Accepted: 9 December 1999

Abstract

The g-factor, the intrinsic magnetic anisotropy energy (MAE) and the magnetization are determined from high-precision multi-frequency ferromagnetic resonance measurements and SQUID magnetometry. In and superlattices we find different reduced magnetic moments per Fe atom of and assuming theoretically calculated V moments of and at the interface planes of the two samples. Increased values of the spectroscopic splitting g-factor with respect to bulk Fe are measured. By comparison with theoretical calculations, with the measured MAE and with previous experiments, we conclude that the larger g-values are most likely due to the ferrimagnetic response of the exchange coupled layers and not to an enhanced orbital moment in Fe. In addition, we find evidence that the induced magnetic moment of the V atom persists above the Curie temperature in the paramagnetic regime.