HIGH-FIELD MAGNETIZATION OF DYFE4AL8 SINGLE-CRYSTAL

Magnetization measurements were carried out in fields up to 150 kOe at temperatures from 4.2 to 50 K. At 4.2 K a metamagnetic transition occurs at about 15 kOe for the a direction and at 30 kOe for the c direction. The saturation is observed starting from 30 kOe (about 6 mu(B) per formula unit) for a and from 50 kOe (about 3 mu(B) per formula unit) for the c axis. For both directions the remanence dose to the saturation value was observed. The remanence is weakly dependent on temperature in the range 4.2-30 K and decreases to 0 at about 33 K. Below 25 K a thermomagnetic effect was observed. A paramagnetic-like behaviour of the magnetization was observed at 50 K.