Approach to Saturation in Textured Soft Magnetic Materials

the magnetic properties.[4,5,6] Recent work on nonoriented THE motivation for this article is to demonstrate the steels has demonstrated how sensitive the magnetic properinfluence of texture (crystallographic-preferred orientation) ties are to subtle variations in processing conditions.[2] Speon the magnetic properties of sheets of soft magnetic matericifically, the sheet is temper rolled to a reduction in the 0 als, such as iron. The technological application of interest to 10 pct range and, then, annealed in a controlled atmosis that of rotating electrical machinery in which the magnetic phere that often contains hydrogen. The final annealing step field experienced by the material rotates in a plane. The is known as the quality development anneal (QDA) because key parameter is the “core loss” or specific power loss, it is critical for developing the desired magnetic properties. commonly expressed as a power per unit mass, which can The core loss and permeability are dependent on the temper be related to the magnetic permeability of the material. There reduction and the surface roughness of the rolls, among other are various measures of permeability; for example, initial parameters. High permeability, post-QDA was associated permeability is sensitive to aspects of microstructure other with anisotropy in the magnetic properties, which in turn is than texture. Examples are domain structure and secondassociated with the Goss component. This article will attempt phase particles that act as pinning points. The focus in this to show the link between texture and the observed variation article is on (the secant) permeability at large applied fields. in permeability. This choice is made in order to investigate the influence of