Landolt-Börnstein - Group III Condensed Matter Field-induced anisotropy


This chapter briefly discusses induced magnetic anisotropy in application-oriented amorphous ferromagnetic alloys. Technically important parameters of magnetic materials depend directly on the magnitude and direction of magnetic anisotropy. For example, low values of anisotropy are required for materials with high initial permeability, low coercivity, as well as low static losses. The following methods are applied to affect anisotropy: simple annealing, annealing in magnetic field, annealing with applied external stress, or a combination thereof. Anisotropy can also be induced by flow casting in a magnetic field or by cold rolling. Directional ordering of mobile magnetic atomic pairs in the neighbourhood of free volumes, which is known in crystalline alloys as well, represents one of the possible mechanisms for the field annealing induced anisotropy. Illustration in this chapter include magnetic anisotropy Ku induced by annealing for 1 h at 200 ºC and 300 ºC in a magnetic field of 1 kOe and subsequent cooling in the field to room temperature as a function of B concentration x for Fe100-x Bx and Co100-x Bx, respectively. Field annealing induced magnetic anisotropy Ku as a function of composition, field-induced magnetic anisotropy Ku as a function of Fe content x for various annealing temperatures Ta, field-induced magnetic anisotropy Ku as a function of annealing temperature T2 for various values of the Fe content x are illustrated for certain amorphous ferromagnetic alloys.

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Title Field-induced anisotropy
Book Title
Magnetic Alloys for Technical Applications. Soft Magnetic Alloys, Invar and Elinvar Alloys
In Induced magnetic anisotropy
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Landolt-Börnstein - Group III Condensed Matter
  • H. P. J. Wijn
  • Authors
  • S. Roth
  • A. R. Ferchmin
  • S. Kobe
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