Ferromagnetic-like hysteresis and an exchange biasing effect in bulk spin-density-wave CrCoV alloys

The temperature and field dependence of the magnetization of the spin-density-wave (SDW) alloys (Cr+ y% Co) 1− x V x ( y=3.2 and 6.5% Co, 0⩽ x⩽5% V) has been measured with a SQUID magnetometer over the temperature range, 2⩽T ⩽400 K , in magnetic fields up to H =5.5 T in the field cooled (FC) and zero-field cooled (ZFC) states. An exchange biasing effect is observed after field cooling in a strong magnetic field. In the alloys (Cr+6.5% Co) 1− x V x ( x⩾1% V), ferromagnetic-like hysteresis is observed in the FC state but not in the ZFC state. These effects are caused by magnetic interaction between the moment on the Co impurity atom with the SDW.