Spin-transfer dynamics in spin valves with out-of-plane magnetized CoNi free layers

William H. Rippard, Alina M. Deac, Matthew R. Pufall, Justin M. Shaw, Mark W. Keller, Stephen E. Russek, Gerrit E.W. Bauer, Claudio Serpico

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)

Abstract

We have measured spin-transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. The frequencies and powers of the excitations agree well with the predictions of the single-domain model and indicate that the excited dynamics correspond to precessional orbits with angles ranging from zero to 90°as the applied current is increased at a fixed field. From measurements of the onset current as a function of applied field strength we estimate the magnitude of the spin torque asymmetry parameter Λ1.5. By combining these with spin torque ferromagnetic resonance measurements, we also estimate the spin-wave radiation loss in these devices.

Original languageEnglish
Article number014426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number1
DOIs
Publication statusPublished - 2010 Jan 29
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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