自形成MnF_e2O_4磁性液体的磁性研究  

Studies of Magnetic Properties Of MnFe_2O_4 Self-Formed Ferrofluids

作　　者：杨霞[1,2] 李建[1] 白浪[1] 

机构地区：[1]西南大学物理科学与技术学院 [2]重庆交通大学理学院,重庆400074

出　　处：《西南大学学报（自然科学版）》2007年第1期9-14,共6页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市自然科学基金(CSTC;2005BB4106);西南师范大学发展基金(SWNUF2004005).

摘　　要：采用共沉淀法制备MnFe_2O_4磁性纳米微粒,并配制自形成磁性液体．测量了微粒粒径,以及MnFe_2O_4磁性纳米微粒、自形成磁性液体的磁性．磁性液体呈现出微粒所具有的矫顽力,其比饱和磁化强度与剩余磁化强度之比都是3:1的关系．在高场下的磁化性质随φ_v变化．通过分析得出自形成MnFe_2O_4磁性液体的磁性除与微粒磁性、微粒体积分数φ_v以及基液磁性有关外,还受微粒表面非磁性层的影响．MnFe2O4 magnetic nano-particles are synthesized using chemical coprecipitation and self-formed ferrofluids are prepared. Their size is determined, and the magnetism of the MnFe2O4 magnetic nano-particles and the self-formed ferrofluids is measured. The ferrofluids exhibit similar coercivity to that of the nano-particles. The ratio of specific saturation magnetization to remanent magnetization is 3 ： 1 for both the particles and the ferrofluids. The magnetizatin property of the feerofluids varies with Фv in high field. Analysis shows that not only is the magnetism of self-formed MnFe2O4 ferrofluids associated with the magnetism of the particles and their carrier liquid and volume fraction, it is also influenced by the non-magnetic layer on the particle surface.

关 键 词：锰铁氧体 磁性液体 磁性 

分 类 号：O482.54[一般工业技术—材料科学与工程]