Interfacial defects controlled electrical and magnetotransport in Co/ZnO nanocomposites

C. Y. Hsu, J. C.A. Huang, Y. H. Lee, S. F. Chen, C. P. Liu, S. J. Sun, Yonhua Tzeng

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


This work demonstrates, by frequency-dependent electrical measurements, significant variation associated with interfacial defects in Co/ZnO nanocomposites (NCs) for electrical and magnetic transport. Radio-frequency impedance measurements showed that heat treatment in an ultrahigh vacuum (UHV) increased interfacial defect density. Interfacial defects-assisted transport reduced the magnetoresistance (MR) ratio from 5.04% for the as-grown sample to 0.17% following heat treatment in UHV. The evolution of the onset frequency of power-law dispersion conductivity revealed that the increase in the interfacial defect density in Co/ZnO NCs upon heat treatment was consistent with the change in MR.

Original languageEnglish
Article number052504
JournalApplied Physics Letters
Issue number5
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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