Thermal aging of FeCuNbSiB nanocrystalline materials under DC magnetic field

• Published in: Journal of magnetism and magnetic materials Vol. 592; p. 171799
• Main Authors: Saoudi, Rania, Morel, Laurent, Raulet, Marie Ange, Lekdim, Atef
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2024; Elsevier
• Subjects: Anisotropic energy; Engineering Sciences; Induced anisotropy; Magnetic aging; Magnetic characterizations; Nanocrystalline; Magnetic aging; Anisotropic energy; Induced anisotropy; Magnetic characterizations; Nanocrystalline
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2024.171799

•Aging of nanocrystalline materials results from a modification in the induced anisotropy initially created during annealing.•Aging of nanocrystalline materials depends mainly on the magnetic state.•Applying DC magnetic field during aging creates a uniform anisotropy.•Uniform anisotropy can be induced at low temperatures than annealing temperatures, but with longer duration.•All grades transform to square loop if a DC magnetic field is applied in the ribbon’s axis during aging. 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.