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arXiv · 2501.02544

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

M. M. Islam·M. A. Islam·Rana Hossain·M. J. Hosen·M. D. I. Bhuyan
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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.

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M. M. Islam, M. A. Islam, Rana Hossain, M. J. Hosen, M. D. I. Bhuyan. 2025-01-05. Investigation of magnetic ordering with spin reorientation transition and optical properties in Dy$_2$CoCrO$_6$ nanomaterials. https://doi.org/10.1016/j.physb.2024.416368

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