Magnetic properties of soft magnetic composites prepared with crystalline and amorphous powders

• Published in: Journal of magnetism and magnetic materials 2011-08, Vol.323 (15), p.1938-1944
• Main Authors: Périgo, E.A., Nakahara, S., Pittini-Yamada, Y., de Hazan, Y., Graule, T.
• Format: Article
• Language: English
• Subjects: Coercive force; Coercivity; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Core loss; Crystal structure; Density; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Fe and its alloys; Insulators; Magnetic permeability; Magnetic properties and materials; Magnetic property; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physical properties; Physics; Rule of mixture; Soft magnetic composite; Studies of specific magnetic materials
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2011.02.025

Physical properties of soft magnetic composites prepared with a mixture of amorphous (FeSiBC) and crystalline (Fe) powders coated with distinct electrical insulator contents are reported. Density, saturation polarization, permeability and coercivity of the cores reduce linearly with the increase of the softer magnetic phase amount and a general relation can be expressed by a rule of mixtures. The behavior of the coercivity, as a function of the magnetic phase content, differs from that previously reported for magnetic composites prepared with equal amounts of magnetic and non-magnetic phases. For frequencies upto 1 kHz the magnetic losses of the cores are constant, following the same behavior of the coercivity. A qualitative explanation of the behavior of the latter is addressed based on an expression applicable for crystalline and amorphous materials. ► Fe and FeSiBC were used as starting material. ► Magnetic properties of composites change linearly with the amount of magnetic phases. ► For frequencies up to 1 kHz the magnetic losses are approximately constant.