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- 2018
CoFe2与CoFe2O4质量比及MgO稀释对CoFe2@CoFe2O4磁性的影响
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Abstract:
采用金属有机盐热分解方法制备了MgO包覆的CoFe2O4纳米粒子（CoFe2O4@MgO），然后将CoFe2O4@MgO在H2中还原，接着在空气中氧化制备了一组CoFe2@CoFe2O4@MgO样品；用盐酸溶液溶解CoFe2@CoFe2O4@MgO中的MgO获得另一组样品（CoFe2@CoF2O4）。测量并绘制了CoFe2@CoFe2O4@MgO和CoFe2@CoF2O4的磁化强度随外磁场及温度变化的关系曲线。随着氧化温度升高，CoFe2@CoFe2O4@MgO和CoFe2@CoF2O4的矫顽力Hc、饱和磁化强度Ms、剩磁比Mr/Ms及磁有序状态发生显著变化，这些变化强烈依赖于磁性粒子的各向异性及粒子间的偶极相互作用。 MgO coated CoFe2O4 nanoparticles (CoFe2O4@MgO) were synthesized by the thermal decomposition of a metal-organic salt. CoFe2O4@MgO was reduced in H2 and then oxidized in air to prepare a group of CoFe2@CoFe2O4@MgO samples. Then MgO was dissolved by the HCl solution to obtain the other group of samples (CoFe2@CoF2O4). The magnetic field and temperature dependent magnetization curves were measured on CoFe2@CoF2O4 and CoFe2@CoFe2O4@MgO samples. The significant changes of coercivity Hc, saturation magnetization Ms and remanence ratio Mr/Ms as well as the magnetic ordering states with the oxidation temperature are observed for CoFe2@CoF2O4 and CoFe2@CoFe2O4@MgO samples, which strongly depend on the anisotropy of the magnetic particles and interparticle dipolar interaction. 国家自然科学基金（51471001）
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