Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars

Q. Mistral; Joo Von Kim; T. Devolder; P. Crozat; C. Chappert; J. A. Katine; M. J. Carey; K. Ito

doi:10.1063/1.2201897

Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars

Q. Mistral, Joo Von Kim, T. Devolder, P. Crozat, C. Chappert, J. A. Katine, M. J. Carey, K. Ito

Center for Innovative Integrated Electronic Systems (CIES)

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

106 Citations (Scopus)

Abstract

We study the current and temperature dependences of the microwave voltage emission of spin-valve nanopillars subjected to an in-plane magnetic field and a perpendicular-to-plane current. Despite the complex multilayer geometry, clear microwave emission is observed for current densities in the interval of 9× 107 -13× 107 A cm-2. The emission frequency stays near 12 GHz when I< Ired =11.2× 107 A cm-2, then redshifts with a slope gradually reaching -350 MHzmA for 16× 107 A cm-2. The linewidth narrows exponentially to 3.8 MHz at 150 K for I< Ired, then broadens again as the emitted voltage redshifts. The temperature dependence of the linewidth exhibits a curvature change around the linewidth minimum.

Original language	English
Article number	192507
Journal	Applied Physics Letters
Volume	88
Issue number	19
DOIs	https://doi.org/10.1063/1.2201897
Publication status	Published - 2006

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2201897

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@article{40106184a5ff40efa0be7517c7af6975,

title = "Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars",

abstract = "We study the current and temperature dependences of the microwave voltage emission of spin-valve nanopillars subjected to an in-plane magnetic field and a perpendicular-to-plane current. Despite the complex multilayer geometry, clear microwave emission is observed for current densities in the interval of 9× 107 -13× 107 A cm-2. The emission frequency stays near 12 GHz when I< Ired =11.2× 107 A cm-2, then redshifts with a slope gradually reaching -350 MHzmA for 16× 107 A cm-2. The linewidth narrows exponentially to 3.8 MHz at 150 K for I< Ired, then broadens again as the emitted voltage redshifts. The temperature dependence of the linewidth exhibits a curvature change around the linewidth minimum.",

author = "Q. Mistral and Kim, {Joo Von} and T. Devolder and P. Crozat and C. Chappert and Katine, {J. A.} and Carey, {M. J.} and K. Ito",

note = "Funding Information: One of the authors (Q.M.) wishes to acknowledge partial support from ST Microelectronics under a joint CNRS PhD grant. ",

year = "2006",

doi = "10.1063/1.2201897",

language = "English",

volume = "88",

journal = "Applied Physics Letters",

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publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars

AU - Mistral, Q.

AU - Kim, Joo Von

AU - Devolder, T.

AU - Crozat, P.

AU - Chappert, C.

AU - Katine, J. A.

AU - Carey, M. J.

AU - Ito, K.

N1 - Funding Information: One of the authors (Q.M.) wishes to acknowledge partial support from ST Microelectronics under a joint CNRS PhD grant.

PY - 2006

Y1 - 2006

N2 - We study the current and temperature dependences of the microwave voltage emission of spin-valve nanopillars subjected to an in-plane magnetic field and a perpendicular-to-plane current. Despite the complex multilayer geometry, clear microwave emission is observed for current densities in the interval of 9× 107 -13× 107 A cm-2. The emission frequency stays near 12 GHz when I< Ired =11.2× 107 A cm-2, then redshifts with a slope gradually reaching -350 MHzmA for 16× 107 A cm-2. The linewidth narrows exponentially to 3.8 MHz at 150 K for I< Ired, then broadens again as the emitted voltage redshifts. The temperature dependence of the linewidth exhibits a curvature change around the linewidth minimum.

AB - We study the current and temperature dependences of the microwave voltage emission of spin-valve nanopillars subjected to an in-plane magnetic field and a perpendicular-to-plane current. Despite the complex multilayer geometry, clear microwave emission is observed for current densities in the interval of 9× 107 -13× 107 A cm-2. The emission frequency stays near 12 GHz when I< Ired =11.2× 107 A cm-2, then redshifts with a slope gradually reaching -350 MHzmA for 16× 107 A cm-2. The linewidth narrows exponentially to 3.8 MHz at 150 K for I< Ired, then broadens again as the emitted voltage redshifts. The temperature dependence of the linewidth exhibits a curvature change around the linewidth minimum.

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