Title :
High-field magnetization of R2Co17 and R2Co17Nx compounds
Author :
Liu, J.P. ; Zhang, Z.D. ; Zeng, D.C. ; Tang, N. ; de Chatel, P.F. ; de Boer, F.R. ; Buschow, K.H.J.
Author_Institution :
Van der Waals Lab., Amsterdam Univ., Netherlands
fDate :
3/1/1994 12:00:00 AM
Abstract :
Magnetization measurements up to 35 tesla have been performed on compounds of the series R2Co17 and R2Co 17Nx (R=rare earth) on particles free to be oriented by the applied field. The magnetic coupling in these compounds has been derived from the magnetic isotherms at 4.2 K by means of a two-sublattice model in the mean-field approximation. It is found that the introduction of interstitial nitrogen decreases the intersublattice-coupling. The interpretation of the magnetic isotherms of the nitrided compounds necessitates an extension of the model. At present, it is not clear whether a non-collinear configuration of the sublattice moments in the field-free state can account for the observed behaviour or the anisotropy within the basal plane will have to be considered to understand the results. The effect of the interstitial nitrogen on the saturation magnetization is discussed
Keywords :
cobalt alloys; ferromagnetic properties of substances; interstitials; magnetic anisotropy; magnetic impurity interactions; magnetic moments; magnetisation; rare earth alloys; 0 to 35 T; R2Co17; R2Co17Nx; anisotropy; interstitial; intersublattice-coupling; magnetic isotherms; mean-field approximation; saturation magnetization; sublattice moments; two-sublattice model; Erbium; Eyes; Ferrimagnetic materials; Laboratories; Magnetic moments; Magnetic properties; Magnetization processes; Neodymium; Powders; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
