The most part of literature shows the maghemite with three broad peaks at around 360-380, 500 and 660-720 cm -1 . "In practice, these bands are most often accompanied by bands testifying to the presence of other iron oxide or oxyhydroxide species" . To determine the peaks of maghemite, Chourpa and coworkers opted for nanoparticles. In the Figure and in the The study aims to improve EMI shielding effectiveness. "The acquired fillers were encapsulated in the polyurethane foam matrix with different loading percentages (wt%) to evaluate their role in EMI shielding. … The obtained results revealed that the Fe3O4@rGO composites displayed superparamagnetic behavior and acceptable electrical conductivity value" (Oraby et al., 2022). Oraby and coworkers are giving the Raman spectrum in their Figure , "for the prepared magnetite cluster nanoparticles. The peaks marked with the dashed black lines refer to the vibrational modes of Fe3O4 magnetite and the red ones represent maghemite (γ-Fe2O3). It is clear that the main five peaks for magnetite appeared at 196, 306, 460, 538, and 668 cm -1 , … . On the other hand, the main three peaks of maghemite appeared at 350, 500, and 700 cm -1 , … In this context, other characteristic features of the materials such as the black coloration of its powders or their strong response to external magnetic fields should be considered" .