Complex Permeability After-Effect and Analysis of Power Losses in Ferromagnetic Co-Based Amorphous Alloy

• Authors: J. Kravčák , R. Varga , P. Vojtaník
• Languages of publication: EN

Abstracts

EN

Complex permeability (μ=μ_1-iμ_2) after-effect of near-zero magnetostrictive CoFeCrSiB amorphous alloy was investigated in magnetic field H (t)= H_0exp ( i 2π f t) after demagnetization. For frequencies f from 200 Hz to 2000 Hz and for the small amplitude H_0 < H_{cr} we observed practically constant both realμ_1 and imaginary part μ_2 of permeability. A measured small decrease in the real part μ_1 and increase in the imaginary part μ_2 with frequency f were theoretically calculated for a quadratic form of a domain wall potential E_S (x)=1/2α x^2. The calculated loss factortan δ =μ_2μ_1, which is small at amplitude H_0 < H_{cr}, corresponds to power losses due to eddy currents induced around reversibly moving domain walls.

Keywords

EN

75.40.Gb; 75.60.Ch; 75.60.Lr

Discipline

• 75.60.Ch: Domain walls and domain structure(for magnetic bubbles and vortices, see 75.70.Kw)
• 75.60.Lr: Magnetic aftereffects
• 75.40.Gb: Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 43-46

Dates

published

2008-01

received

2007-07-09

Contributors

author

J. Kravčák

• Department of Physics, FEI, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

author

R. Varga

• Institute of Physics, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

P. Vojtaník

• Institute of Physics, P. J. Šafárik University, Park Angelinum 9, 041 54 KoŠice, Slovakia

References

• 1. H. Kronmüller, Philos. Mag. B 48, 127 (1983)
• 2. S. Chikazumi, Physics of Magnetism, Wiley, New York 1964
• 3. P. Vojtaník, J. Kravčák, R. Varga, J. Magn. Magn. Mater. 157/158, 175 (1996)

Identifiers

DOI

10.12693/APhysPolA.113.43