Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars

Jaivardhan Sinha; Masamitsu Hayashi; Yukiko K. Takahashi; Tomohiro Taniguchi; Maksim Drapeko; Seiji Mitani; Kazuhiro Hono

doi:10.1063/1.3647771

Large amplitude microwave emission and reduced nonlinear phase noise in Co₂Fe(Ge_0.5Ga_0.5) Heusler alloy based pseudo spin valve nanopillars

Jaivardhan Sinha, Masamitsu Hayashi, Yukiko K. Takahashi, Tomohiro Taniguchi, Maksim Drapeko, Seiji Mitani, Kazuhiro Hono

IMRAM - Division of Inorganic Material Research

National Institute for Materials Science Tsukuba

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

28 Citations (Scopus)

Abstract

We have studied microwave emission from a current-perpendicular-to-plane pseudo spin valve nanopillars with Heusler alloy Co₂Fe(Ga _0.5Ge_0.5) electrodes. Large emission amplitude exceeding 150 nV/Hz^0.5, partly owing to the large magnetoresistance, and narrow generation linewidth below 10 MHz are observed. We also find that the linewidth shows significant dependence on the applied field magnitude and its angle within the film plane. A minimum in the linewidth is observed when the slope of the frequency versus current becomes near zero. This agrees with theoretical prediction that takes into account non-linear phase noise as a source for linewidth broadening.

Original language	English
Article number	162508
Journal	Applied Physics Letters
Volume	99
Issue number	16
DOIs	https://doi.org/10.1063/1.3647771
Publication status	Published - 2011 Oct 17

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title = "Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars",

abstract = "We have studied microwave emission from a current-perpendicular-to-plane pseudo spin valve nanopillars with Heusler alloy Co2Fe(Ga 0.5Ge0.5) electrodes. Large emission amplitude exceeding 150 nV/Hz0.5, partly owing to the large magnetoresistance, and narrow generation linewidth below 10 MHz are observed. We also find that the linewidth shows significant dependence on the applied field magnitude and its angle within the film plane. A minimum in the linewidth is observed when the slope of the frequency versus current becomes near zero. This agrees with theoretical prediction that takes into account non-linear phase noise as a source for linewidth broadening.",

author = "Jaivardhan Sinha and Masamitsu Hayashi and Takahashi, {Yukiko K.} and Tomohiro Taniguchi and Maksim Drapeko and Seiji Mitani and Kazuhiro Hono",

note = "Funding Information: We are very grateful to C. Kline for technical support on sample fabrication. This work was partly supported by Grant-in-Aids for Scientific Research (A) (No. 22246091), the JSPS through its “FIRST program” and PRESTO-JST.",

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doi = "10.1063/1.3647771",

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T1 - Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars

AU - Sinha, Jaivardhan

AU - Hayashi, Masamitsu

AU - Takahashi, Yukiko K.

AU - Taniguchi, Tomohiro

AU - Drapeko, Maksim

AU - Mitani, Seiji

AU - Hono, Kazuhiro

N1 - Funding Information: We are very grateful to C. Kline for technical support on sample fabrication. This work was partly supported by Grant-in-Aids for Scientific Research (A) (No. 22246091), the JSPS through its “FIRST program” and PRESTO-JST.

PY - 2011/10/17

Y1 - 2011/10/17

N2 - We have studied microwave emission from a current-perpendicular-to-plane pseudo spin valve nanopillars with Heusler alloy Co2Fe(Ga 0.5Ge0.5) electrodes. Large emission amplitude exceeding 150 nV/Hz0.5, partly owing to the large magnetoresistance, and narrow generation linewidth below 10 MHz are observed. We also find that the linewidth shows significant dependence on the applied field magnitude and its angle within the film plane. A minimum in the linewidth is observed when the slope of the frequency versus current becomes near zero. This agrees with theoretical prediction that takes into account non-linear phase noise as a source for linewidth broadening.

AB - We have studied microwave emission from a current-perpendicular-to-plane pseudo spin valve nanopillars with Heusler alloy Co2Fe(Ga 0.5Ge0.5) electrodes. Large emission amplitude exceeding 150 nV/Hz0.5, partly owing to the large magnetoresistance, and narrow generation linewidth below 10 MHz are observed. We also find that the linewidth shows significant dependence on the applied field magnitude and its angle within the film plane. A minimum in the linewidth is observed when the slope of the frequency versus current becomes near zero. This agrees with theoretical prediction that takes into account non-linear phase noise as a source for linewidth broadening.

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Large amplitude microwave emission and reduced nonlinear phase noise in Co₂Fe(Ge_0.5Ga_0.5) Heusler alloy based pseudo spin valve nanopillars

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