Title :
Change of permeability and GMI in amorphous Co71Fe1 Mo1Mn4Si14B9 alloy before and after heat treatment
Author :
Ryu, Gil Ho ; Yu, Seong-Cho ; Kim, Cheol Gi ; Lachowicz, H.K.
Author_Institution :
Dept. of Phys., Chungbuk Nat. Univ., Cheongju, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
The complex permeability spectra of amorphous ribbons were measured as a function of ac magnetic field. At relatively high magnetic field, the spectra showed the superposition of two Debye type dispersions attributed to the relaxation processes of domain wall motion and rotational magnetization. The permeability from the wall motion was maximum in the sample annealed at 250°C, while the permeability from rotational magnetization was maximum at the sample annealed at 350°C. The magneto-impedance (MI) profile changed sensitively with measuring frequency and annealing temperature. The changes of magneto-impedance with annealing temperature were discussed in terms of magnetic softness and domain change due to the annealing
Keywords :
amorphous magnetic materials; annealing; boron alloys; cobalt alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic domain walls; magnetic permeability; magnetisation; manganese alloys; molybdenum alloys; silicon alloys; soft magnetic materials; 250 C; 350 C; Co71Fe1Mo1Mn4Si 14B9; Debye type dispersions; amorphous Co71Fe1Mo1Mn4 Si14B9; amorphous ribbons; annealing temperature; complex permeability spectra; domain wall motion; heat treatment; magnetic softness; magneto-impedance profile; permeability; relaxation processes; rotational magnetization; superposition; Amorphous magnetic materials; Amorphous materials; Annealing; Frequency measurement; Magnetic domain walls; Magnetic domains; Magnetic field measurement; Magnetization; Permeability measurement; Temperature sensors;
Journal_Title :
Magnetics, IEEE Transactions on
