This research investigates Cu-Cr co-substituted M-type barium hexaferrites synthesized via a green approach with mentha leaves extract. A series of BaCuxCrxFe12‐2xO19 hexaferrites with varying Cu-Cr content was prepared using a simple heat treatment method. Structural, thermal, magnetic, Raman spectroscopic, and dielectric properties were thoroughly characterized, revealing M-phase formation and successful Cu-Cr substitution. The x=0.2 composition exhibited a maximum Ms of 68.99 Am2/kg and lowest Hc of 0.1 T, indicating hard magnetic nature. Cole-Cole graphs demonstrated peak shifts with Cu-Cr substitutions, suggesting potential applications in lossless, low-frequency scenarios.

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