Cobalt ferrite duo to its high coercivity, moderate saturation magnetization, high magneto crystalline anisotropy,high chemical and mechanical hardness is one of the good candidates for high-density recording media, sensors,transformer cores, and microwaves devices [1-2]. The substitutionof non-magnetic Al 3+ ions in cobalt ferrite can reduce the loss factor, and thus improve the efficiency of microwave devices and transformers applications. The present work reports the synthesis of CoFe 2-x Al x O 4 nanoparticles and studyof their structural and magnetic properties through X-ray diffraction and magnetization measurements.

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