Title :
The effect of torsion stress on the circumferential permeability of CoFeBSi amorphous wires
Author :
Betancourt, I. ; Valenzuela, R.
Author_Institution :
Inst. de Investigaciones en Mater., Nat. Univ. of Mexico, Mexico City, Mexico
Abstract :
In this paper, a domain model and the complex inductance formalism are employed to study the effect of torsion stress on the low-frequency magnetoimpedance (MI) response of CoFeBSi amorphous wires (125 μm in diameter). In particular, the torsional dependence of the calculated circumferential permeability μφ is found to be very sensitive to the wire´s scalar permeability μdc which, in turn, depends inversely on the wire´s induced anisotropy Ki. Calculated μφ exhibited a marked increase for increased μdc and a decrease for reduced μdc. Experimental spectroscopic plots of μφ under various torsion stresses (counter- and clockwise-oriented) which resulted in various helically induced anisotropies Kh are consistent with an enhancement/counterbalancing effect of Ki through the addition/subtraction of Kh to Ki.
Keywords :
amorphous magnetic materials; boron alloys; cobalt alloys; ferromagnetic materials; induced anisotropy (magnetic); inductance; iron alloys; magnetic domains; magnetic permeability; magnetomechanical effects; metallic glasses; silicon alloys; soft magnetic materials; (Co94Fe6)72.5B15Si12.5; 125 micron; CoFeBSi; CoFeBSi amorphous wires; amorphous (Co94Fe6)72.5B15Si12.5 wires; circumferential permeability; complex inductance formalism; domain model; enhancement/counterbalancing effect; ferromagnetic wires; helically induced anisotropies; induced anisotropy; scalar permeability; torsion stress; torsional dependence; Amorphous magnetic materials; Amorphous materials; Anisotropic magnetoresistance; Inductance; Magnetic anisotropy; Magnetic domains; Permeability; Perpendicular magnetic anisotropy; Stress; Wires;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816016
