Is. Tereshina et al., RARE-EARTH AND TRANSITION-METAL SUBLATTICE CONTRIBUTIONS TO MAGNETIZATION AND MAGNETIC-ANISOTROPY OF R(TM,TI)(12) SINGLE-CRYSTALS, Journal of alloys and compounds, 277, 1998, pp. 625-628
The substitution effect of Fe by Co on magnetic properties (magnetizat
ion, anisotropy field, Curie temperature) of R(TM, Ti)(12) (R = Y, Sm;
TM = Fe, Co) single crystals have been studied. The temperature and c
omposition dependence of magnetization and magnetic anisotropy constan
ts K-1 and K-2 in the range 77-1000 K have been determined using torqu
e and vibrating specimen magnetometry techniques. Fe-57 Mossbauer spec
tra of powdered samples of SmFe11-xCoxTi have been studied at room tem
perature. The easy magnetization direction of RFe11-xCoxTi single crys
tals was found to be coinciding with the c axis for x less than or equ
al to 5. A characteristic maximum in concentration dependence of satur
ation magnetization is found for x approximate to 3. The concentration
dependence of magnetic anisotropy constant K-1 for RFe11-xCoxTi singl
e crystals exhibited a maximum at x approximate to 1. It is found that
the Sm-sublattice contribution to magnetic anisotropy decreases rapid
ly with increasing Co concentration. (C) 1998 Published by Elsevier Sc
ience S.A.