CAJ | 학술논문

通过溶剂热反应合成纳米结构 Co0.8Fe2.2O4多孔微球.用 X 射线衍射仪(XRD)、透射电子显微镜( TEM)和扫描电子显微镜( SEM)表征样品的结构和形貌,结果表明：所制备的Co0.8 Fe2.2 O4多孔微球由许多纳米颗粒组装而成,直径约200 nm.用振动样品磁强计( VSM)测量Co0.8 Fe2.2 O4多孔微球的变温磁性,发现低温下Co0.8 Fe2.2 O4多孔微球存在显著的正交换偏置效应.组成Co0.8 Fe2.2 O4多孔微球的纳米颗粒可看作一个表面反铁磁排列与内部亚铁磁排列共存的系统,且内部亚铁磁与表面反铁磁的相互作用为反铁磁性,Co0.8 Fe2.2 O4纳米颗粒系统具有正交换偏置效应.
통과용제열반응합성납미결구 Co0.8Fe2.2O4다공미구.용 X 사선연사의(XRD)、투사전자현미경( TEM)화소묘전자현미경( SEM)표정양품적결구화형모,결과표명：소제비적Co0.8 Fe2.2 O4다공미구유허다납미과립조장이성,직경약200 nm.용진동양품자강계( VSM)측량Co0.8 Fe2.2 O4다공미구적변온자성,발현저온하Co0.8 Fe2.2 O4다공미구존재현저적정교환편치효응.조성Co0.8 Fe2.2 O4다공미구적납미과립가간작일개표면반철자배렬여내부아철자배렬공존적계통,차내부아철자여표면반철자적상호작용위반철자성,Co0.8 Fe2.2 O4납미과립계통구유정교환편치효응.
Co0. 8 Fe2. 2 O4 porous nanostructure microspheres were prepared by solvothermal reaction. X-ray diffraction ( XRD ) , scanning electron microscopy ( SEM ) and transmission electron microscopy ( TEM) were used to characterize the structure and morphology of samples. The results showed that the prepared Co0. 8 Fe2. 2 O4 porous microspheres with about 200 nm diameter, were assembled by many nanoparticles. The magnetic properties were evaluated with a vibrating sample magnetometer ( VSM) . The significant positive exchange bias effect was found at lower temperature in Co0. 8 Fe2. 2 O4 porous microspheres. Co0. 8 Fe2. 2 O4 porous microspheres were assembled by many nanoparticles, and the nanoparticles could be seen as a surface antiferromagnetic arrangement and internal ferrimagnetic ordering coexistence system. The interaction between internal ferrimagnetic layer and antiferromagnetic surface layer was antiferromagnetic, so the Co0. 8 Fe2. 2 O4 nanoparticles system possessed positive exchange bias effect.