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Size effects in bimagnetic CoO/CoFe_2O_4 core/shell nanoparticles

机译：双磁性CoO / CoFe_2O_4核/壳纳米粒子的尺寸效应

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摘要

The control of the size of bimagnetic nanoparticles represents an important step toward the study of fundamental properties and the design of new nanostructured magnetic materials. We report the synthesis and the structural and magnetic characterization of bimagnetic CoO/CoFe_2O_4 core/ shell nanoparticles. The material was fabricated by a seed-mediated growth high-temperature decomposition method with sizes in the range of 5-11 nm. We show that the core/shell morphology favours the crystallinity of the shell phase, and the reduction of the particle size leads to a remarkable increase of the magnetic hardening. When the size is reduced, the coercive field at 5 K increases from 21.5 kOe to 30.8 kOe, while the blocking temperature decreases from 388 K to 167 K. The size effects on the magnetic behaviour are described through a phenomenological model for strongly ferri-/antiferromagnetic coupled phases.
机译：双磁性纳米粒子尺寸的控制代表了基础性能研究和新型纳米结构磁性材料设计的重要一步。我们报告了合成和双磁性CoO / CoFe_2O_4核/壳纳米粒子的结构和磁性表征。该材料通过种子介导的生长高温分解方法制造，尺寸在5-11 nm范围内。我们表明，核/壳形态有利于壳相的结晶度，而粒径的减小导致磁硬化的显着增加。当尺寸减小时，5 K时的矫顽场从21.5 kOe增大到30.8 kOe，而阻挡温度从388 K减小到167K。尺寸对磁行为的影响通过强铁素体/反铁磁耦合相。

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