Magnetic properties evolution of a high permeability nanocrystalline FeCuNbSiB during thermal ageingAtef Lekdim, Laurent Morel and Marie-Ange RauletEur. Phys. J. Appl. Phys., 79 2 (2017) 20601DOI: https://doi.org/10.1051/epjap/2017160449