Thermal aging of FeCuNbSiB nanocrystalline materials under DC magnetic field

One of the main problems in reducing the volume of electrical systems is the exposure of components, such as magnetic cores, to high temperatures. These severe conditions degrade their properties not only instantly (reversible phenomena) but also over time (irreversible phenomena due to aging). The aging of nanocrystalline materials has been studied in a few works, either in their demagnetized state or their residual magnetization state. However, these conditions do not represent the real operating environment. This paper addresses this issue by studying the aging of nanocrystalline materials in the presence of a DC magnetic field. The study concerns three grades of nanocrystalline cores, characterized by their B-H loop shapes: round, flat, and square. The investigation focuses on the monitoring of macroscopic magnetic properties, followed by an analysis of anisotropic energies and their role in aging mechanisms.