Spin canting phenomenon in cadmium doped cobalt ferrites, CoCd𝑥Fe2−ð�?�¥O4 (ð‘�? = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), synthesized using solâ€�?�gel auto combustion method

Bulletin of materials science

Kailash Chandra³  Sandeep Bansal²  Sheenu Jauhar¹  Sonal Singhal¹ 

[1] Department of Chemistry, Panjab University, Chandigarh 160 014, India$$Department of Chemistry, Panjab University, Chandigarh 160 014, IndiaDepartment of Chemistry, Panjab University, Chandigarh 160 014, India$$;Department of Science and Technology, New Delhi 110 016, India$$Department of Science and Technology, New Delhi 110 016, IndiaDepartment of Science and Technology, New Delhi 110 016, India$$;33/1, Bhagirath Kunj, Railway Station Road, Roorkee 247 667, India$$33/1, Bhagirath Kunj, Railway Station Road, Roorkee 247 667, India33/1, Bhagirath Kunj, Railway Station Road, Roorkee 247 667, India$$

关键词: Transmission electron microscope;    electrical resistivity;    spin canting.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Synthesis of non-collinear (spin canted) ferrites having the formula, CoCd_ð‘�?Fe_{2−ð�?��?}O₄ (ð‘�? = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), has been carried out using the solâ€�?�gel auto combustion method. The ferrite samples show an interesting magnetic transition from Neel to Yafetâ€�?�Kittel configuration, as the Cd²⁺ concentration is increased beyond ð‘�? = 0.4. The FTâ€�?�IR spectra confirm the formation of the metal oxide bond as they exhibit two frequency bands in the range of ∼595 cm^-1 and ∼450 cm^-1, corresponding to the tetrahedral and the octahedral stretching vibrations of the metal oxide, respectively. The structural evolutions of the nanophase investigated using powder X-ray diffraction (XRD) technique show that the average crystallite size is ∼35 nm. The magnetic studies reveal that the saturation magnetization, 𝑀_s, increases up to ð‘�? = 0.4 and decreases when the value of ð‘�? is > 0.4. It is proposed that the incorporation of Cd²⁺ ion takes place into the tetrahedral sites and up to ð‘�? = 0.4, Neel’s model is followed. But for ð‘�? > 0.4, canting of spins occurs, as explained by Yafetâ€�?�Kittel (Yâ€�?�K) model. The d.c. resistivity decreases as a function of temperature, indicating semiconducting nature of the ferrites and the positive value of Seebeck coefficient establishes ð‘�?-type conduction behaviour for all the ferrite samples.

【 授权许可】

Unknown