Title :
Current annealing and magnetoimpedance in CoFeBSi amorphous ribbons
Author :
Valenzuela, R. ; González, J. ; Amano, E.
Author_Institution :
Nat. Univ. of Mexico, Mexico City, Mexico
fDate :
9/1/1997 12:00:00 AM
Abstract :
CoFeBSi amorphous ribbons were current-annealed at 600 mA for times ranging from 9 sec to 5 min. Their complex impedance response was measured in the frequency range 5 Hz-13 MHz, under a DC field of zero and at 6.3 kA/m. Transverse permeability (and therefore magnetoimpedance) showed a maximum for an annealing time of ~1 min, while the propagating field (or unpinning field) for transverse domain walls, exhibited a minimum for the same annealing time. These results show the direct dependence of magnetoimpedance on transverse induced anisotropy, and are interpreted in terms of the dependence of the latter on two competing configurations
Keywords :
amorphous magnetic materials; annealing; boron alloys; cobalt alloys; electric impedance; ferromagnetic materials; galvanomagnetic effects; induced anisotropy (magnetic); iron alloys; magnetic domain walls; magnetic permeability; silicon alloys; 5 Hz to 13 MHz; 600 mA; 9 sec to 5 min; CoFeBSi; amorphous ribbons; annealing time; complex impedance response; current annealing; magnetoimpedance; transverse domain walls; transverse induced anisotropy; transverse permeability; unpinning field; Amorphous magnetic materials; Amorphous materials; Annealing; Frequency measurement; Impedance measurement; Magnetic anisotropy; Magnetic domain walls; Magnetic domains; Magnetic field measurement; Perpendicular magnetic anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
