Magneto-History Effect in the TbxGd1-xNi3Compounds

The compounds TbxGd1-xNi3 with a PuNi3-type structure have been obtained.The magnetic properties have been investigated by using SQUID magnetometer (Quantum Design MPMS, temperature from 1.9 K to 300 K and magnetic eld up to 7 T).The partial replacement of Gd by Tb atoms is reected in a decrease of the ordering temperature from 115 K (x = 0.0) to 81 K (x = 1.0) as well as the increase of the saturation magnetic moment MS from 6.93 µB/f.u.(x = 0.0) to 7.14 µB/f.u.(x = 1.0).A large dierence of M (T ) curves has been noticed between the so-called eld coolingzero eld cooling magnetization.The thermomagnetic curves are sensitive to the applied magnetic eld and their origin can be understood as the domain-wall pinning eect and as the temperature dependence of coercivity.