Agilent 5991-4714EN Materials Measurement Magnetic Materials - Application Brief c20140717 [5] free download

File name 5991-4714EN Materials Measurement_ Magnetic Materials - Application Brief c20140717 [5].pdf

Keysight Technologies Materials Measurement: Magnetic Materials Application Brief 02 | Keysight | Materials Measurement: Dielectric Materials - Application Brief Overview Permeability also varies with temperature. The desired measure- ment system is one that can evaluate temperature characteristics Ferrite materials are widely used in electronic equipment such as with sufficient accuracy over a wide frequency range using a computers, communication devices, power management systems, simple operation. etc. They serve as inductive components, transformers, magnets, magnetic field absorbers and suppressors. Solution Continual exploration of new materials helps not only to improve performance, but to reduce size and power consumption. Recent The complex permeability is derived by measuring the impedance progress in the material science and nanotechnology area has of the magnetic material. It is done by winding some wire around created new types of ferrite materials and components. the material and measuring the impedance with respect to the ends of the wire. The result may change depending on how the Evaluation of magnetic characteristics of those materials is wire is wound and how the magnetic field interacts with its sur- important in predicting performance of the components. Perfor- roundings. mance includes permeability and loss of the material at various frequencies where the devices are used. Impedance analyzers used with magnetic material fixtures pro- vides precise, repeatable, cost-effective and an easy-to-operate measurement system over a wide frequency range. Figure 1. Method of measuring effective permeability The Keysight 16454A magnetic material test fixture provides an ideal structure, configuring a single-turn inductor with the mate- rial molded into a toroidal shape. There is no leakage flux in the single-turn inductor and the magnetic field in the fixture is strictly calculated from the electromagnetic theory. Problem Complex permeability is a magnetic property of a material. Its