Roles of spin-polarized current and spin accumulation in the current-induced magnetization switching

T. Yang, J. Hamrle, T. Kimura, Y. Otani

Research output: Contribution to journalArticlepeer-review

Abstract

To clarify the contributions of spin-polarized current and spin accumulation to the current-induced magnetization switching, the effects of the top electrode size of the magnetic nanopillar are investigated both theoretically and experimentally. Theoretical calculation demonstrates that the spin-polarized current and the spin accumulation can be adjusted in opposite directions by modifying the size of the top electrode. Increase in the size of the top electrode suppresses the spin accumulation but enhances the spin-polarized current inside the nanopillar. On the other hand, it is shown experimentally that the nanopillar with a wide top electrode exhibits small critical switching current compared to the nanopillar with a narrow top electrode. The results suggest that the spin-polarized current contributes to the current-induced magnetization switching dominantly over the spin accumulation.

Original languageEnglish
Pages (from-to)389-397
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume301
Issue number2
DOIs
Publication statusPublished - Jun 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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