Weak ferromagnetism along the third-order axis of the FeBO3 crystals caused by Fe2+ impurity ions

Ovchinnikov, SG; Rudenko, VV; Vorotynov, AM JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 454 139-143; 10.1016/j.jmmm.2018.01.037 MAY 15 2018

Using the single-ion approximation, the weak ferromagnetic moment σZ(Fe2+) along the third-order axis of FeBO3 crystals, which is caused by the contribution of Fe2+ ions, has been investigated in the framework of the model Fe2+ impurity ion –BO3 vacancy. The extreme low-temperature behavior of the total magnetic moment due to the strong dependence of the Fe2+ion contribution is predicted.