Magnetic viscosity in Nd-Fe-B sintered magnets

Magnetic viscosity in Nd-Fe-B sintered magnets was measured at different fields between 4.2 and 300 K. At a given temperature, the viscosity S( H) and the irreversible susceptibility χ irr are found to be proportional. The temperature dependence of the coefficient S v = S/ χ irr is deduced and an ex...

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Veröffentlicht in:	Journal of magnetism and magnetic materials 1987-07, Vol.67 (3), p.L281-L285
Hauptverfasser:	Givord, D., Lienard, A., Tenaud, P., Viadieu, T.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Domain effects, magnetization curves, and hysteresis Exact sciences and technology Magnetic properties and materials Materials science Metals, semimetals and alloys Other topics in magnetic properties and materials Physics Specific materials
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Zusammenfassung:	Magnetic viscosity in Nd-Fe-B sintered magnets was measured at different fields between 4.2 and 300 K. At a given temperature, the viscosity S( H) and the irreversible susceptibility χ irr are found to be proportional. The temperature dependence of the coefficient S v = S/ χ irr is deduced and an expression for the activation energy is derived. It is found that the intrinsic activation energy E 0 is proportional to the domain wall energy, whilst the activation volume is proportional to the cube of the domain wall width.
ISSN:	0304-8853
DOI:	10.1016/0304-8853(87)90185-5