Investigation of magnetic ordering with spin reorientation transition and optical properties in Dy${}_2$CoCrO${}_6$ nanomaterials

Abstract

This study reports the synthesis and physical properties of polycrystalline Dy${}_2$CoCrO${}_6$ (DCCO) nanoparticles. Analysis of the powder X-ray diffraction (XRD) pattern using Rietveld refinement showed that the compound crystallizes in an orthorhombic crystal structure with a space group Pbnm. The particle size of approximately 57 nm was confirmed through micrographs obtained from field emission scanning electron microscopy and transmission electron microscopy. The X-ray photoelectron spectroscopy (XPS) investigations identified a mixed-valence state of Co and Cr cations. Magnetic susceptibility data indicated Curie-Weiss behavior in the temperature range 140-340 K and the onset of antiferromagnetic interactions with a Neel temperature of 119 K. At 31 K, DCCO shows spin reorientation transition from ${\Gamma }_4$(G${}_x$A${}_y$F${}_z$) to ${\Gamma }_2$(F${}_x$C${}_y$G${}_z$). Furthermore, room-temperature magnetization measurements demonstrated the antiferromagnetic behavior with weak ferromagnetic interactions at low temperatures. Additionally, DCCO exhibited semiconducting behavior with a direct optical bandgap of 1.97 eV, indicating promise for visible-light-driven energy harvesting and catalytic applications.

References in corpus (1)

• Sol-gel synthesized double perovskite Gd${}_2$FeCrO${}_6$ nanoparticles: Structural, magnetic and optical properties