Giant spin-accumulation signal and pure spin-current-induced reversible magnetization switching

Tao Yang, Takashi Kimura, Yoshichika Otani

Research output: Contribution to journalArticle

199 Citations (Scopus)

Abstract

A number of proposed next-generation electronic devices, including novel memory elements and versatile transistor circuits, rely on spin currents, that is, the flow of electron angular momentum. A spin current may interact with a magnetic nanostructure and give rise to spin-dependent transport phenomena, or excite magnetization dynamics. In contrast to a spin-polarized charge current, a pure spin current does not produce any charge-related spurious effects. One way to produce a pure spin current is non-local electrical-spin injection, but this approach has suffered so far from low injection efficiency. Here, we demonstrate a significant enhancement of the non-local injection efficiency in a lateral spin valve prepared with an entirely in situ fabrication process. Improvements to the interface quality and the device structure lead to an increase of the spin-signal amplitude by an order of magnitude. The generated pure spin current enables the magnetization reversal of a nanomagnet with the same efficiency as in the case of using charge currents. These results are important for further theoretical developments in multi-terminal structures, but also with a view towards realizing novel devices driven by pure spin currents.

Original languageEnglish
Pages (from-to)851-854
Number of pages4
JournalNature Physics
Volume4
Issue number11
DOIs
Publication statusPublished - Nov 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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