Spin transfer oscillators emitting microwave in zero applied magnetic field

T. Devolder, A. Meftah, K. Ito, J. A. Katine, P. Crozat, C. Chappert

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Using pillar-shaped spin valves with the magnetization of the reference layer being pinned perpendicularly to the easy axis of the free layer, we show that spin-transfer-induced microwave emission can be obtained at exactly zero applied magnetic field and in its vicinity. The frequency tunability (typically 150 MHz/mA), the spectral purity (quality factor up to 280), and the power (up to 5 nV/Hz1/2) of the emission compares well with other spin-transfer oscillators based on spin-valve nanopillars. This ability to get satisfactory microwave emission without needing bulky magnetic field sources may arise from a small nonvanishing field-like term in the current-induced torque. It may be of interest for the design of submicron microwave sources.

Original languageEnglish
Article number063916
JournalJournal of Applied Physics
Volume101
Issue number6
DOIs
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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