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

^*この研究の対応する著者

研究成果: Article › 査読

28 被引用数 (Scopus)

抄録

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.

本文言語	English
論文番号	162508
ジャーナル	Applied Physics Letters
巻	99
号	16
DOI	https://doi.org/10.1063/1.3647771
出版ステータス	Published - 2011 10月 17
外部発表	はい

ASJC Scopus subject areas

物理学および天文学（その他）

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10.1063/1.3647771

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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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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.

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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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