Unveiling the Impact of Spin and Cation Dynamics on Raman Spectroscopy in Co-Ferrite

Abstract

Raman spectroscopy offers profound insights into the vibrational dynamics of spinel ferrites, yet the precise assignment of these modes presents a notable challenge. This difficulty stems from the complex structure of spinel ferrites, where metal cations of varying spins populate distinct lattice sites, complicating the spectroscopic characterization. Specifically, cobalt ferrite is extensively utilized in electronic applications due to its superior magnetic properties, influenced significantly by the degree of inversion, denoted as (x), and the spin configurations within the crystal. While the magnetic influences of (x) are well-documented, its impact on other material properties has not been thoroughly investigated through first-principles calculations. This study delves into how varying degrees of inversion from (x = 0) to (x = 1) and different magnetic interactions─ferromagnetism, ferrimagnetism, and antiferromagnetism─affect the Raman vibrational modes of cobalt ferrite. We introduce a new perspective on the mode assignments by comparing our findings with existing experimental data. These insights could significantly refine experimental synthesis protocols, ensuring the production of materials optimized for specific applications. The interplay between inversion and spin configurations not only elucidates the vibrational properties but also enhances our understanding of the fundamental physics governing these versatile materials.