Title :
Magnetic viscosity, susceptibility and fluctuation fields in sintered NdFeB
Author :
Tomka, G.J. ; Bissell, P.R. ; O´Grady, K. ; Chantrell, R.W.
Author_Institution :
Lancashire Polytech., Preston, UK
fDate :
9/1/1990 12:00:00 AM
Abstract :
The magnetic viscosity and irreversible susceptibility of a sample anisotropic sintered NdFeB have been measured using a vibrating sample magnetometer. Measurements confirm the feasibility of the grain boundary pinning coercivity mechanism. Measured as a function of local field, the fluctuation field is found to decrease with an increasing demagnetization field, with a dip at the coercivity. These results are found to agree with a model based on a randomly oriented system of noninteracting uniaxial fine particles
Keywords :
boron alloys; coercive force; ferromagnetic properties of substances; iron alloys; magnetic anisotropy; magnetic properties of fine particles; magnetic susceptibility; neodymium alloys; permanent magnets; anisotropic; coercivity; fluctuation field; fluctuation fields; grain boundary pinning coercivity mechanism; irreversible susceptibility; local field; magnetic viscosity; noninteracting uniaxial fine particles; randomly oriented system; sintered NdFeB; susceptibility; Anisotropic magnetoresistance; Coercive force; Fluctuations; Magnetic anisotropy; Magnetic field measurement; Magnetic susceptibility; Magnetometers; Perpendicular magnetic anisotropy; Vibration measurement; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on
