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A green technology for producing barium ferrite (BaFe 12 O 19) nanoparticles (BFNP’s) using Acorus Calamus rhizome extract was realized. To confirm the phase of magnetoplumbite structure without any impurities, the method of powder X-ray diffraction was performed using the Rietveld analysis and the FullProf program with the P6 3/mmc (No. 194) space group. Unit cell parameters were a= 5.8902 (2) Å and c= 23.2103 (7) Å. According to Scherrer’s calculations, the average crystallite size was from∼ 32 to∼ 35 nm. The results of scanning electron microscopy confirmed that synthesized BFNP’s are tightly packed and have an average grain size of∼ 70 nm. Raman and IR active modes predicted by group theory are observed at∼ 175 cm− 1 and∼ 677 cm− 1, which corresponds to the presence of a spinel structure and trigonal pyramidal position in barium hexaferrite. It was established that the spontaneous …