Accession Number : ADA112383

Title :   Crystallization and Domain Properties of Thinned Amorphous FeBSi Ribbon.

Descriptive Note : Annual rept.,


Personal Author(s) : Grundy,P. J. ; Jones,G. A. ; Parker,S. F. H. ; Tebble,R. S.

Report Date : 08 MAR 1982

Pagination or Media Count : 12

Abstract : A transmission electron microscope study has been made of the crystallization and associated domain behaviour of an amorphous Fe82B15Si3 alloy. The first obvious signs of crystallization in microscope-annealed foils occurs at a temperature of about 345 C with the appearance of alpha-iron nuclei. These crystallites grow with annealing time but the grain size at complete crystallization is still small (approx. 0.1 micron). At a temperature of 500 C a b.c.t. Fe2B phase is formed. Furnace annealed specimens differ in that the iron nuclei have a dendritic morphology. The as-quenched material shows an isotropic domain structure with no magnetization ripple. The onset of crystallization is accompanied by the formation of this magnetization dispersion and, in some cases, stripe domains which reflect a perpendicular anisotropy. The results of in-situ magnetization observations of the domain structure clearly indicate the perturbing effects of the crystallization products. (Author)

Descriptors :   *Crystallization, *Iron compounds, *Boron, *Silicides, *Electron microscopes, Domain walls, Thinness, Amorphous materials, Annealing, Furnaces, Magnetization, Anisotropy, Dendritic structure, Morphology, Grain size, Nuclei, Perturbations, Ripples, Dispersions

Subject Categories : Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE