  We have studied the magnetic properties of the non-superconducting
RuSr2Ln1.5Ce0.5Cu2O10 (Ln=Y, Dy and Ho, Ru-1222) compounds synthesized under
high pressure (6 Gpa) at elevated temperature. The materials become
magnetically ordered at TM =152(2) K regardless of Ln. The wide
ferromagnetic-like hysteresis loops which open at 5 K, close themselves around
Tirr= 90-100 K and the remanent magnetizations (Mrem) and the coercive fields
(HC) become zero. Surprisingly, at Tirr<T< TM a reappearance of the Mrem and HC
(with a peak at 120-130 K) is observed for all three samples studied. For the
non-magnetic Ln=Y compound, the extracted saturation moment at 5 K and the
effective paramagnetic moment are is 0.75 and 2.05 mB /Ru, values which are
close to the expected 1 mB and 1.73 mB respectively, for the low-spin state of
Ru5+. We argue that the Ru-1222 system becomes (i) anti-ferromagnetically (AFM)
ordered at TM. In this range a metamagnetic transition is induced by the
applied field (ii). At Tirr < TM, weak-ferromagnetism (W-FM) is induced by the
canting of the Ru moments.
