Tunable magnetic order of Co nanoparticles and magnetotransport in CoZnO nanocomposites

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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We demonstrate tunable magnetic order of cobalt nanoparticles in CoZnO nanocomposites. High-density electronic states in ZnO formed during high vacuum annealing help generate bound and free charge carriers, which in turn enable the stable magnetic ordering of Co nanoparticles in the CoZnO nanocomposites in a tunable manner. This is demonstrated by the following experimental observations: (i) enhanced spontaneous magnetization and coercivity, (ii) transition from semiconducting to metallic electrical-transport, and (iii) transverse magnetotransport transition from negative magnetoresistance to the anomalous Hall effect. The work explores a route to manipulate the magnetic order of magnetic nanoparticles by means of intentionally generated defects in oxides.

Original languageEnglish
Article number072506
JournalApplied Physics Letters
Volume93
Issue number7
DOIs
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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