THE TEMPERATURE-DEPENDENT IN-PLANE AND OUT-OF-PLANE MAGNETIC ANISOTROPIES IN FE-N V-M(001) SUPERLATTICES/

Fe-n/V-m(001) superlattices grown on MgO(001) are studied by ferromagn etic resonance (FMR). The temperature dependence of the second- and fo urth-order in- and out-of-plane magnetic anisotropies were determined from azimuthal and polar angular-dependent FMR for an Fe-4/V-4 sample. A very small step-induced in-plane uniaxial anisotropy K-2 parallel t o indicates the existence of very large atomically Bat terraces result ing in a perfect structural quality, in agreement with x-ray diffracti on studies. The competition between surface and volume anisotropic com ponents results in an unusual temperature dependence of the total inpl ane fourfold anisotropy K-4 parallel to possibly changing the easy axi s from the [100] to [110] in-plane directions at temperatures higher t han room temperature. Finally, the FMR-linewidth values are typical fo r samples with a very high degree of homogeneity, comparable to that o f Fe whiskers.