Magnetic properties, microstructures and magnetoresistance effect in Co/Alq3 granular films

X. M. Zhao, G. Ni, Q. Shu, P. Sheng, J. Q. Wu, J. F. Yin, B. Ma, Q. Y. Jin

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A series of Cox(Alq3)1-x granular films were prepared using the co-evaporating technique. HRTEM images show typical characteristics of granular films with the average size of 2-5 nm. It shows a gradual change from superparamagnetism to ferromagnetism with the rise of x. Negative magnetoresistance (MR) was observed, reaching -5.31% in x=0.44 sample at 30 K under the field of 10 kOe. The concentration dependence of MR and resistivity is also investigated. The inter-particle tunneling is believed to account for the negative MR effect.

Original languageEnglish (US)
Pages (from-to)418-422
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number5
DOIs
StatePublished - Mar 1 2009

Keywords

  • Granular film
  • Magnetoresistance
  • Organic semiconductor

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