Amorphous Nd-Co thin films exhibit stripe shaped periodic magnetic domains with local out-of-plane magnetization components due to their perpendicular magnetic anisotropy. This anisotropy has been quantified in a fairly simple way by reproducing the experimental magnetization curves by means of micromagnetic numerical simulations. The simulations show that the first (K1) and second (K2) anisotropy constants must be used to properly describe the variation of the stripe domains with the in plane applied magnetic field. A strong temperature dependence of both K1 and K2 has been obtained between 10 K and room temperature. This anisotropy behavior is characteristic of two magnetically coupled 3d-4f sublattices with competing anisotropies.

The authors acknowledge the financial support from Spanish MINECO under projects FIS2013-45469 and FIS2016-76058 (AEI/FEDER,UE). A. Hierro-Rodriguez acknowledge support from FCT of Portugal (Grant SFRH/BPD/90471/2012) and POPH/FSE programs.

Peer reviewed