The Investigation of the Magnetization Reversal Mechanism in the Nd-Fe-B Type Magnet, Aligned by Hot Deformation |
| M. Dośpiała, M. Nabiałeka, M. Szotab, W. Lipiecc, V.I. Nizhankovskiid, A.E. Ceglareka and P. Pietrusiewicza
aInstitute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland bInstitute of Materials Science, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland cElectrotechnical Institute, M. Skłodowskiej-Curie 55/61, 50-369 Wrocław, Poland dInternational Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95, 53-421 Wrocław, Poland |
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| The magnetization reversal mechanism in the Nd16Fe78B6 hot densified magnet, aligned by means of die-upset forging has been investigated. The magnetic parameters have been derived from major hysteresis loop. The magnetocrystalline anisotropy constants K1 and K2 using Sucksmith-Thompson relation modified by Ram and Gaunt have been calculated from the high field measurements up to 5 T. These data have been used to determine the theoretical value of coercivity as a function of the angle Ψ0 between the sample easy axis and the applied magnetic field direction. The experimental value of coercivity as a function of Ψ0 has been determined from the demagnetization curves measured for different Ψ0 angles. It was found that the best correlation between theoretical and experimental data have been achieved for magnetization reversal mechanism controlled partially by pinning of domain walls on grain boundaries and nucleation processes. |
| DOI: 10.12693/APhysPolA.121.1282 PACS numbers: 75.30.Gw, 75.30.Kz, 75.50.Vv, 75.50.Ww, 75.60.Jk |