Title :
Rare earth iron based magnetic materials with the Th2Zn 17-type structure
Author :
Weitzer, F. ; Hiebl, K. ; Rogl, P.
Author_Institution :
Inst. fuer Physikalische Chemie, Wien Univ., Austria
fDate :
9/1/1990 12:00:00 AM
Abstract :
The influence of the substitution mode on the magnetic behavior in RE2Fe17 has been investigated as a function of (a) the metal substitution (Fe replaced by Mn, Al, Ga) and (b) the accommodation of interstitial carbon atoms. X-ray powder analysis demonstrated consistency with the rhombohedral Th2Zn17 -type structure in all cases. In correspondence with the resulting volume expansion, Curie temperatures tend to increase as a result of an enhanced ferromagnetic coupling mechanism. Sm2Fe17-x-y Mnx (Al,Ga)yC3-z, however, is the only system where substitution of iron in Sm2Fe17 by Mn, Al, Ga and/or carbon leads to an anisotropy change from easy-plane to easy-axis geometry. Magnetization values are strongly reduced due to a change of collinear ferromagnetism to a ferrimagnetic type of order of the various magnetic sublattices
Keywords :
Curie temperature; X-ray diffraction examination of materials; aluminium alloys; ferrimagnetic properties of substances; ferromagnetic properties of substances; gallium alloys; iron alloys; magnetic anisotropy; magnetisation; manganese alloys; permanent magnets; samarium alloys; Curie temperatures; Sm2Fe17-x-yMnx(AlGa)y C3-z; Th2Zn17-type structure; X-ray powder analysis; accommodation; anisotropy change; collinear ferromagnetism; easy-axis geometry; easy-plane; enhanced ferromagnetic coupling mechanism; ferrimagnetic type; magnetic materials; magnetisation; volume expansion; Anisotropic magnetoresistance; Geometry; Iron; Magnetic analysis; Magnetic anisotropy; Magnetic materials; Perpendicular magnetic anisotropy; Powders; Temperature; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
