Structure and magnetic properties of MgFe2O4 nanoparticles prepared by the low-temperature solid-state reaction method
MgFe2O4 nanoparticles with different grain sizes were prepared by the low-temperature solid-state reaction method. The X-ray diffractometer (XRD), vibrating sample magnetometer (VSM), superconducting quantum interference devices (SQUID) and 57Fe M(o)sbauer spectroscopy (MS) were used to characterize the structure, magnetic properties and surface anisotropy of nanoparticles. Oxygen parameters suggested that lattice distortion was decreased with reducing particle size. In comparison with the bulk material, smaller saturation magnetization (Ms) and larger coercive force (Hc) for nanoparticles were observed. The critical sizes for transition from multidomain to single domain and for superparamagnetic transition were estimated to be 25 nm and 28 nm, respectively. In summary, the fabricating conditions for the low-temperature solid-state reaction method are studied to improve Ms and reduce Hc of the films, making the films suitable to the applications of the magnetic targeted drug.
MgFe2O4 Nanoparticle Low-temperature solid-state reaction
Jianrong Sun Zhiguang Wang Yuyu Wang Kongfang Wei Fashen Li
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
316-318
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）