Exploring spin reorientation-induced magnetization reversal with inverse exchange bias effect and ab-initio DFT calculations on ferrimagnetic Gd2NiIrO6 iridates

In this study, tunable bipolar magnetization reversal with an inverse exchange bias effect and magnetically switched magnetocaloric effect are reported in the hetero-tri-spin of a 3d-5d-4f based Gd2NiIrO6 (GNIO) polycrystalline sample. The sample was prepared using a conventional solid-state reaction method. Temperature (T)-dependent direct current (DC) and alternating current (AC) magnetic susceptibility studies revealed that GNIO exhibits ferrimagnetic (FiM) behavior below the transition temperature TN ∼164 K owing to the Ni2+– O2-– Ir4+ superexchange interactions. With the application of 500 Oe, low-field-cooled (HFC) induced magnetization reversal (MR) below the compensation temperature (Tcomp) ∼28 K, and a spin re-orientation (SR) like behavior at TSR ∼96 K were observed in FC mode within the temperature region of Tcomp