Structural Modulation and Enhanced Magnetic Performance in Mn‐Substituted SrFe ₁₂ O ₁₉ : A Comprehensive Correlation Study

Herein, the chemical coprecipitation process is used to synthesize M‐type strontium hexaferrite (SrFe 12 O 19 , SrM) and manganese‐substituted strontium hexaferrite (SrFe 12− x Mn x O 19 , SrMnM), with x = 0.36, 0.60, and 0.84. The primary crystal phase is hexagonal with space group P 6 3 / mmc , and small traces of secondary phases, identified as hematite (α‐Fe 2 O 3 ) and halite (NaCl), are detected by X‐ray diffraction analysis. Also, Rietveld refinement methods are used to extract information on the phase composition and the average bond lengths and angles from the refined crystal structure parameters. Fourier transform infrared analysis indicates the presence of distinctive absorption bands related to the vibration FeO and FeOFe. A Thermogravimetric analysis determines the optimal temperature for developing the M‐type hexaferrite phase. Magnetic hysteresis loops show that magnetic parameters increases with increasing manganese substitution. Also, the single‐domain behavior of the synthesized material is confirmed by the M r / M s ratios. The enhanced magnetic properties of the synthesized materials offer promising potential for use in permanent magnets and magnetic recording applications.