Investigations of effective magnetic anisotropy and magnetostriction of amorphous and nanocrystalline Fe71.5Cu1Nb3Al2Si13.5B9 alloy by FMR

Experimental data on uniaxial in-plane anisotropy field (HK) and magnetostriction (λs) of the amorphous and nanocrystalline Fe71.5Cu1Nb3Al2Si13.5B9 alloy obtained by ferromagnetic resonance (FMR) method are presented. The results are compared with those obtained by the transverse biased initial susceptibility method. The nanostructured phase was produced by means of thermal treatment (480–600 °C during 1 h) to develop the devitrification of the precursor amorphous material. The role of the Al enhancing the soft magnetic character with respect to the Al-free classical Finemet composition are also analyzed.