Synthesis and exchange bias effect of CoFe2O4/CoO composite ceramics

Synthesis and exchange bias effect of CoFe2O4/CoO composite ceramics
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CoFe2O4/CoO复合陶瓷的合成及交换偏压效应

DOI:
10.1016/j.matchemphys.2010.08.027
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发表时间:
2010-12
影响因子:
4.6
通讯作者:
Jing Shi
Jing Shi
中科院分区:
材料科学3区
文献类型:
--
作者:
Yue zhang;Fang dong;Yong liu;Chunlong Fei;Chunxu Pan;Di Yin;Rui Xiong;Jing Shi

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采用化学燃烧法制备了亚铁磁性(FM)CoFe2O4和反铁磁性(AFM)CoO复合陶瓷。X射线衍射、扫描电子显微镜和能谱分析等表征结果表明,CoFe2O4纳米粒子嵌入到CoO基质中。磁测量表明,在10000Oe的外加磁场下,当陶瓷冷却到10K时,磁滞回线显示出106Oe的小的负交换偏置场。此外,在冷却过程中,包括矫直力、剩磁和Hesow在内的磁参数明显地依赖于温度和外加磁场。这种交换偏置效应归因于FM/AFM界面的交换耦合。
Composite ceramics composed of the ferrimagnetic (FM) CoFe2O4and the antiferromagnetic (AFM) CoO were synthesized by using the chemical combustion method. The characterization measurements including X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis show that CoFe2O4nano-particles are embedded in CoO matrix. The magnetic measurements show that the hysteresis loops display a small negative exchange bias field (He) of 106Oe as the ceramic is cooled to 10K in an applied field of 10,000Oe. Furthermore, the magnetic parameters including coercivity, remanence, and Heshow clear dependence on temperature and the applied magnetic field in the cooling procedures. This exchange bias effect is ascribed to the exchange coupling at the FM/AFM interfaces.
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