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

By William H. Rippard, A. Deac, M. Pufall, J. Shaw, M. Keller, S. Russek, G. Bauer, C. Serpico. 2009

146 citations recorded by the source corpus.

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 ??1.5. By combining these with spin torque ferromagnetic resonance measurements, we also estimate the spin-wave radiation loss in these devices.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/337c42a91afa98336ee27f407b0587c4f614da71

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Spin-Torque and Spin-Hall Nano-Oscillators (2015, background): “At small applied magnetic fields, a small-angle precessional FMRlike mode is observed with relatively small power [80].”