The Magnetic Symmetry of α-Mn and the Parasitic Ferromagnetism from Magnetic Torque Measurements

Abstract

Magnetic torque measurements on α-Mn were performed as a function of applied magnetic field in the range H <12 kOe for temperatures 4.2^°K≦ T < T N =95^°K. The principal axis of the magnetic symmetry was determined to be along one of the <100> rather than the <111> in the temperature range 45^°K≦ T < T N . At temperatures below 42.5°K a weak ferromagnetic component appeared in the torque curves. This ferromagnetic component corresponds to the parasitic ferromagnetism observed by Arrott et al. . It was found that this magnetism was not intrinsic, but is due to a small amount of Mn 3 O 4 impurity.