<p>Tunable magnetic material for absorbing microwave was achieved by developing zinc doped cobalt ferrite (Co_1−δZn_δFe₂O₄) to reflect its material magnetic property. Mechanical milling was used to make zinc-doped cobalt ferrite from stoichiometric Co₃O₄, ZnO, and Fe₂O₃ raw materials. Morphology investigation using SEM demonstrates that particle sizes increase with Zn²⁺ dopant ion composition. XRD pattern refinement shows all sample compositions are single phase. Peaks indexed to the Fd-3m space group in cubic symmetry resolved satisfactorily. It displayed a peak shift due to the Zn²⁺ dopant ion, and Raman spectroscopy showed six active Raman vibration modes (2A_1g + 3T_2g + E_g). The hysteresis curve of CoFe₂O₄ doped with Zn²⁺ ions show a decrease in ferrimagnetic behavior with Zn²⁺ dopant. This decrease in ferrimagnetic behavior is influenced by the cationic distribution of Co²⁺, Zn²⁺ and Fe³⁺ ions in each tetrahedral and octahedral structure. Substitution of Zn²⁺ ions with a composition of 0 ≤ δ ≤ 1 obtained saturation magnetization through the equation M = -73.143δ² − 7.2571^δ + 85.757. While the coercivity field follows the relationship y = -1440δ³ + 2668.6δ² − 1668.6δ + 438.57. Permittivity and permeability decrease with increasing concentration of Zn²⁺ dopant ions. Two microwave absorption peaks in the X band indicate satisfactory functionality as a microwave absorber. The magnitude of RL_max can be obtained through the relationship y = -29.867δ³ + 49.6δ² − 22.933δ − 12.1.</p>