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

doi:10.1103/PhysRevB.81.014426

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 journal › Article › peer-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 language	English
Article number	014426
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.81.014426
Publication status	Published - 2010 Jan 29
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.81.014426

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Spin-transfer dynamics in spin valves with out-of-plane magnetized CoNi free layers. / Rippard, William H.; Deac, Alina M.; Pufall, Matthew R.; Shaw, Justin M.; Keller, Mark W.; Russek, Stephen E.; Bauer, Gerrit E.W.; Serpico, Claudio.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 1, 014426, 29.01.2010.

Research output: Contribution to journal › Article › peer-review

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AU - Keller, Mark W.

AU - Russek, Stephen E.

AU - Bauer, Gerrit E.W.

AU - Serpico, Claudio

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AB - 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.

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

Abstract

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