اثر دماي بازپخت روي ويژگي هاي ساختاري و مغناطيسي فريت NiCo0.75Fe1.25O4

Effect of annealing temperature on structural and magnetic properties of NiCo0.75Fe1.25O4 nanoparticles

در اين پژوهش، نانو ذرات فريت NiCo0.75Fe1.25O4 به روش سل- ژل خود احتراقي ساخته شد. اثر دماي باز پخت را روي ويژگي هاي ساختاري و مغناطيسي نمونه ها، با تحليل هاي FE - SEM XRD و VSM بررسي كرديم. نتايج XRD نشان داد كه نمونه ساختار اسپينلي مكعبي دارد. بر اساس داده هاي VSM مشخص شد كه با افزايش دماي باز پخت مغناطش اشباع (M2) كمي افزايش مي يابد و ميدان وادارندگي شديد (Hc ) كاهش مي يابد.

In this work, nanocrystalline NiCo0.75Fe1.25O4 was synthesized by the sol-gel auto-combustion method. The effect of annealing temperature on structural and magnetic properties of nanoparticles was investigated by Xray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and vibrating sample magnetometer (VSM). XRD results showed that the crystalline structure of the samples is cubic spinel. Based on the VSM data it is found that by increasing annealing temperature, the saturation magnetization (Ms) was increased and the coercivity (Hc) was decreased significantly.