Electron holography of single-crystal iron nanorods encapsulated in carbon nanotubes

Takeshi Fujita, Mingwei Chen, Xiaomin Wang, Bingshe Xu, Koji Inoke, Kazuo Yamamoto

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20 Citations (Scopus)


α-Fe nanorods encapsulated in multiwall carbon nanotubes (CNTs) were characterized by x-ray diffraction (XRD), high resolution electron microscopy (HREM), and electron holography. HREM observations revealed that the α-Fe nanoparticles were single crystals with a preferential growth direction of 〈200〉α-Fe oriented along CNTs. Phase distributions of an α-Fe nanorod were measured by electron holography and the remanent state was retrieved by a three-dimensional morphological model and an algorithm with the consideration of irregular nanoparticle shape. It was found that the saturated magnetization of the α-Fe nanorod with a CNT outer shell was very close to that of bulk pure α-Fe, suggesting that the core-shell nanostructure effectively prevented the surface oxidation that had been found to significantly degrade the magnetic properties of nanostructured α-Fe.

Original languageEnglish
Article number014323
JournalJournal of Applied Physics
Issue number1
Publication statusPublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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