Magnetic behaviour of nano-particles of Fe2.8Zn0.2O4

Pramana

Bipin K Srivastava1²  Anjali Krishnamurthy²  V K Aswal¹  Seema Lakhanpal²  Subhash Chander² 

[1] Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;Department of Physics, University of Rajasthan, Jaipur 302 004, India$$

关键词: Nano-particles;    magnetic relaxation;    anisotropy.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Magnetization measurements are reported on a nano-particle sample of Zn- substituted spinel ferrite Fe2.8Zn0.2O4 in the temperature range 20-300 K. Analysis of small-angle neutron scattering data shows the sample to have a log-normal particle size distribution of median diameter 64.4 Å and standard deviation 0.38. Magnetization evolves over a long period of time 𝑡 going nearly linearly with log 𝑡. Magnetic anisotropy, estimated by fitting 𝑀-log 𝑡 curve, shows many fold increase over that of bulk particle sample. Major enhancement owes to disordered moments in surface layer. In the nano-particle state as well increasing amount of Zn causes anisotropy to decrease.

【 授权许可】

Unknown