Permeability deduced from impedance measurements at microwave frequencies

We present both circumferential, mf; and parallel, m8; permeabilities of a Co68.15Fe4.35Si12.5B15 amorphous wire. We determined mf from impedance measurements up to 10 GHz using a network analyzer with the wire as the central conductor of a coaxial line. We determined m8 from impedance variations up to 1 GHz with the wire mounted as the core of a conductive loop driven by a microwave signal of a network analyzer. We report here on the design of the sample holders, on the measurements and on the methods used for their analysis, including the details of the effect of sample mounting on the results. r 2002 Elsevier Science B.V. All rights reserved. PACS: 75.50.k; 75.80; 85.70