Mapping magnetic fields of Fe3O4 nanosphere assemblies by electron holography

Kai He, Fei Xiang Ma, Cheng Yan Xu, John Cumings

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Crystalline Fe3O4 nanospheres with averaged diameters of 150 nm have been synthesized by a facile solvothermal method and characterized using transmission electron microscopy and electron holography. The nanospheres can self-assemble into either chain-like or ring-like shapes with sizes of a few micrometers, where large magnetic moments are found for individual particles at the remanent state and lead to strong fringing field in vicinity of the assemblies. Magnetic dipolar moments can be aligned both within and out of the sample plane, with a typical length scale on the order of 500 nm.

Original languageEnglish (US)
Article number17B528
JournalJournal of Applied Physics
Issue number17
StatePublished - May 7 2013

ASJC Scopus subject areas

  • General Physics and Astronomy


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