Title :
Magnetic viscosity of Zn-bonded Sm2Fe17Nx magnets
Author :
Eckert, D. ; Muller, K.-H. ; Wendhausen, P.A.P. ; Wolf, M. ; Givord, D. ; Rossignol, M.F. ; Villas-Boas, V.
Author_Institution :
Inst. fur Festkorper- und Werkstofforschung Dresden eV, Germany
fDate :
3/1/1994 12:00:00 AM
Abstract :
The magnetic aftereffect of textured Zn-bonded Sm2Fe 17N2.9 was investigated using the extraction method for fixed external magnetic fields. A simple fitting procedure was developed in order to determine effectively the viscosity S and the correct type of irreversible susceptibility χirr. There is no proportionality in the polarization dependence of S and χirr resulting in a strong polarization dependence of the viscosity coefficient Sυ. The variation of the activation volume v with temperature, polarization and magnetic field is explained by a nonhomogeneous distribution of intrinsic properties, e.g. anisotropy constants, due to a nonhomogeneous degree of nitrogenation
Keywords :
ferromagnetic properties of substances; iron alloys; magnetic aftereffect; magnetic anisotropy; magnetic susceptibility; samarium alloys; zinc; Sm2Fe17N2.9; Sm2Fe17N2.9-Zn; Zn-bonded magnets; anisotropy constants; irreversible susceptibility; magnetic aftereffect; magnetic viscosity; nitrogenation; polarization dependence; viscosity coefficient; Demagnetization; Iron; Magnetic field measurement; Magnetic materials; Magnetization processes; Magnets; Polarization; Samarium; Time measurement; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on
