Current-induced vortex-vortex switching in a nanopillar comprising two Co nano-rings

T. Yang, A. Hirohata, M. Hara, T. Kimura, Y. Otani

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The authors fabricated a current-perpendicular-to-plane pseudo-spin-valve nanopillar comprising a thick and a thin Co rings with deep submicron lateral sizes. The dc current can effectively induce the flux-closure vortex states in the rings with desired chiralities. Abrupt transitions between the vortex states are also realized by the dc current and detected with the giant magnetoresistance effect. Both Oersted field and spin-transfer torque are found important to the magnetic transitions, but the former is dominant. They can be designed to cooperate with each other in the vortex-to-vortex transitions by carefully setting the chirality of the vortex state in the thick Co ring.

Original languageEnglish
Article number092505
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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