Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Poster Ib: Magnetic Materials (1-14); Micro Magnetism/Computational Mag. (15-17); Surface Magnetism (18-22); Spin Structures/Phase Transitions (23-25)
MA 14.8: Poster
Dienstag, 24. März 2009, 10:15–13:00, P1B
Measurements of nanocrystalline ferromagnetic materials and their potential for use as core materials at low temperatures — •René Geithner1, Alexander Steppke2, Ralf Neubert1, Wolfgang Vodel1, and Paul Seidel1 — 1Institute of Solid State Physics, Friedrich Schiller University of Jena, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
A low temperature SQUID-based measuring instrument, which employs the Cryogenic Current Comparator (CCC) principle, is used for high-precision, non-contact current measurements of particle beams. The CCC consists of a high-performance LTS DC SQUID system, a toroidal pick-up coil and a meander-shaped superconducting niobium shield. Theoretical investigations show that as external noise decreases, improvements in performance depend on the properties of the ferromagnetic core material, especially the relative permeability, embedded in the pick-up coil. Here we present the temperature and frequency dependence of several candidate ferromagnetic and nanocrystalline materials (Vitroperm by VAC Hanau and Nanoperm by Magnetec). Measurements of the magnetic losses and associated noise figures are presented in respect to the permeability.