Giant Exchange Bias of Hysteresis Loops on Cr³⁺-doped Ag Nanoparticles

In this study, we fabricate Cr-doped Ag nanoparticles (AgCrO₂ and Ag_0.5Cr_2.5O₄) by flash autocombustion method. XRD confirmed that the samples have a single-phase spinel structure. The morphology is studied using high-resolution transmission electron microscopy (HRTEM) to confirm that the samples are on nanoscale. The magnetic properties are studied using a vibrating sample magnetometer (VSM) at room temperature (300 K) and at low temperatures (200 and 100 K). Exchange bias has occurred for the investigated samples below room temperatures. The shifts have occurred in the horizontal directions which may be ascribed to the frozen spins in the samples.