Pe. Brommer et al., FIELD-INDUCED MAGNETIC PHASE-TRANSITIONS IN A FERRIMAGNET WITH ONE UNSTABLE MAGNETIC SUBSYSTEM, Physics letters. A, 189(3), 1994, pp. 253-256
The magnetization of the f-d ferrimagnet Y0.75Tm0.25(Co0.88Al0.12)2 wi
th an unstable metamagnetic itinerant d-subsystem in the strongly ferr
omagnetic state was measured up to 38 T at 4.2 K. Two metamagnetic tra
nsitions connected with sequential demagnetizing and re-entrant magnet
izing of the d-subsystem were observed. The experimental results are i
n good agreement with the theoretical M(H) dependence calculated for t
he f-d exchange coefficient lambda(fd) = -16.4 T/mu(B) f.u., the Tm ma
gnetic moment mu(f) = 4.3 muB and with the use of the experimental M(H
) curve of Y(Co0.88Al0.12)2. The bend between the two metamagnetic tra
nsitions observed in the experimental curve was interpreted, acccordin
g to calculations, as a region where the noncollinear phase exists.