Accession Number:

ADP012309

Title:

Tailoring of Magnetic Properties of Glass Coated Microwires

Descriptive Note:

Conference proceedings

Corporate Author:

DONOSTIA INTERNATIONAL PHYSICS CENTRE SAN SEBASTIAN (SPAIN)

Report Date:

2001-04-01

Pagination or Media Count:

6.0

Abstract:

The magnetic behaviour of the glass-covered metallic microwires with a wide compositional range of composition with soft and bard magnetic character is presented. The effect of conventional furnace and dc current annealing under dc axial magnetic field or without it as well as of a chemical etching on the magnetic properties of Co and Fe-based glass coated microwires has been studied. Such treatments modify the magnetic parameters. In particular, annealing under applied magnetic field field annealing can improve significantly such magnetic parameters as permeability. Such phenomenology can be interpreted considering the noticeable magnetic anisotropy induced by the combined effects of the magnetic field and strong internal stresses arising from the coating. Giant magnetoimpedance GMI effect was observed in nearly-zero magnetostrictive amorphous microwires. Upon careful heat treatment, FeCuNbSiB amorphous microwires devitrificate into nanocrystalline structure with large variety of magnetic parameters. Hard magnetic materials with coercivity up to 800 Oe were obtained as a result of decomposition of metastable phases in Co-Ni-Cu microwires as well as after crystallization process of FeCuNbSiB amorphous microwires.

Subject Categories:

  • Properties of Metals and Alloys
  • Electricity and Magnetism
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE