单畴Ni球观测及Ni_(core)NiO_(shell)的铁磁/反铁磁耦合研究(英文)

Single-Domain Nanosphere Observation and Ferromagnetic/Antiferromagnetic Coupling of Ni/NiO

使用微波辅助聚合方法制备了单分散单畴Ni纳米球，由MFM发现，尺度分布在100-180nm的Ni球的一个相关特征是条型磁畴结构。用XRD、TEM、XPS以及EDAX测量了由Ni球进一步制备的NicoreNiOshell高度球型纳米结构。用VSM和SQUID进一步讨论了其铁磁／反铁磁界面耦合效应，估算了交换耦合场与粒子尺寸的关系。

Magnetic force microscopy （MFM） measurements were performed on monodispersed single-domain nickel nanospheres fabricated by the microwave-assisted （MW） polyol method. As found by MFM, a relevant characteristic of these spheres with a size distribution in the 100-180 nm range is the magnetic stripe domain structure. The obtained highly globular nanostructures of NicoreNiOshell were measured by XRD,TEM, XPS,and EDAX. The ferromagnet/antiferromagnet interface coupling is discussed with the results of VSM and SQUID. The relation of the exchange-coupling field with particles sizes is evaluated.