Growth and magnetic properties of ferromagnetic Co nanorods filled inside carbon nanotubes towards nanoscale spintronics

Yasuhiko Hayashi, T. Fujita, T. Tokunaga, N. L. Rupesinghe, K. B.K. Teo, G. A.J. Amaratunga, M. Tanemura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We synthesize Co nanorod filled inside multi-walled CNTs (MWCNTs) by microwave plasma enhanced chemical vapor deposition (MPECVD) and utilize off-axis electron holography to observe the remanent states of the filled metal nanorod inside MWCNTs at room. The MWCNTs grew up to 100-110 nm in diameter and 1.5-1.7 μm in length. The typical bright-field transmission electron microscope (TEM) images revealed both Co/Pd multisegment nanorod and Co nanorod filled inside MWCNTs on the same substrate. We have also performed energy-dispersive X-ray spectrometer (EDS) measurements to characterize the composition of metal filled inside MWCNTs. Based on high-resolution TEM measurements, we observed the face-centered-cubic (fcc) Co filled inside MWCNT. The component of magnetic induction was then measured to be 1.2±0.1 T, which is lower than the expected saturation magnetization of fcc Co of 1.7 T. The partial oxidation of the ferromagnetic metal during the process and the magnetization direction may play an important role in the determination of the quality of the remanent states.

Original languageEnglish
Title of host publication2008 2nd IEEE International Nanoelectronics Conference, INEC 2008
Pages1051-1055
Number of pages5
DOIs
Publication statusPublished - Oct 1 2008
Externally publishedYes
Event2008 2nd IEEE International Nanoelectronics Conference, INEC 2008 - Shanghai, China
Duration: Mar 24 2008Mar 27 2008

Publication series

Name2008 2nd IEEE International Nanoelectronics Conference, INEC 2008

Other

Other2008 2nd IEEE International Nanoelectronics Conference, INEC 2008
CountryChina
CityShanghai
Period3/24/083/27/08

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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