Magnetic ordering in the TbNi5 hexagonal compound

Abstract The magnetic properties of the hexagonal compound TbNi 5 have been studied at low magnetic fields. The thermal dependence of the AC susceptibility and of the magnetization as well as the field dependence of the AC susceptibility of a TbNi 5 single crystal show that it is ferromagnetic for fields greater than H c =450 Oe. When the DC field is smaller than H c we observed a magnetic transition at 16.5 K. From our results we propose a helimagnetic behavior of TbNi 5 in the temperature range 16.5–23.5 K.