Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions

Shuichi Iwakiri; Satoshi Sugimoto; Yasuhiro Niimi; Yusuke Kozuka; Yukiko K. Takahashi; Shinya Kasai; Kensuke Kobayashi

doi:10.1103/PhysRevB.103.245427

Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions

Shuichi Iwakiri, Satoshi Sugimoto, Yasuhiro Niimi, Yusuke Kozuka, Yukiko K. Takahashi, Shinya Kasai, Kensuke Kobayashi

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

2 Citations (Scopus)

Abstract

The current-voltage (IV) characteristics beyond the linear response regime of magnetic tunnel junction (MTJ) is systematically investigated. We find a clear negative correlation between the two coefficients to characterize the linear (I∝V) and the lowest-order nonlinear (I∝V3) currents, which holds regardless of the temperature and the thickness of the tunnel barrier. This observation cannot simply be explained by the standard tunneling model such as the Brinkman model, suggesting a mechanism intrinsic to MTJ. We propose a phenomenological model based on the Jullire model that attributes the observed negative correlation to the spin-flip tunneling assisted by a magnon. These results suggest a fundamental law between the linear and the nonlinear response of MTJ.

Original language	English
Article number	245427
Journal	Physical Review B
Volume	103
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.103.245427
Publication status	Published - 2021 Jun 15
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.103.245427

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title = "Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions",

abstract = "The current-voltage (IV) characteristics beyond the linear response regime of magnetic tunnel junction (MTJ) is systematically investigated. We find a clear negative correlation between the two coefficients to characterize the linear (I∝V) and the lowest-order nonlinear (I∝V3) currents, which holds regardless of the temperature and the thickness of the tunnel barrier. This observation cannot simply be explained by the standard tunneling model such as the Brinkman model, suggesting a mechanism intrinsic to MTJ. We propose a phenomenological model based on the Jullire model that attributes the observed negative correlation to the spin-flip tunneling assisted by a magnon. These results suggest a fundamental law between the linear and the nonlinear response of MTJ.",

author = "Shuichi Iwakiri and Satoshi Sugimoto and Yasuhiro Niimi and Yusuke Kozuka and Takahashi, {Yukiko K.} and Shinya Kasai and Kensuke Kobayashi",

note = "Funding Information: This work is partially supported by JSPS KAKENHI Grants No. JP17K18892, No. JP18J20527, No. JP19H00656, No. JP19H05826, No. JP16H05964, No. JPMJPR18L3, and No. JP26103002. The authors acknowledge T. Kato, Y. Ominato, and M. Matsuo for fruitful discussions. The authors also acknowledge M. Takahagi for technical support. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = jun,

day = "15",

doi = "10.1103/PhysRevB.103.245427",

language = "English",

volume = "103",

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T1 - Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions

AU - Iwakiri, Shuichi

AU - Sugimoto, Satoshi

AU - Niimi, Yasuhiro

AU - Kozuka, Yusuke

AU - Takahashi, Yukiko K.

AU - Kasai, Shinya

AU - Kobayashi, Kensuke

N1 - Funding Information: This work is partially supported by JSPS KAKENHI Grants No. JP17K18892, No. JP18J20527, No. JP19H00656, No. JP19H05826, No. JP16H05964, No. JPMJPR18L3, and No. JP26103002. The authors acknowledge T. Kato, Y. Ominato, and M. Matsuo for fruitful discussions. The authors also acknowledge M. Takahagi for technical support. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/6/15

Y1 - 2021/6/15

N2 - The current-voltage (IV) characteristics beyond the linear response regime of magnetic tunnel junction (MTJ) is systematically investigated. We find a clear negative correlation between the two coefficients to characterize the linear (I∝V) and the lowest-order nonlinear (I∝V3) currents, which holds regardless of the temperature and the thickness of the tunnel barrier. This observation cannot simply be explained by the standard tunneling model such as the Brinkman model, suggesting a mechanism intrinsic to MTJ. We propose a phenomenological model based on the Jullire model that attributes the observed negative correlation to the spin-flip tunneling assisted by a magnon. These results suggest a fundamental law between the linear and the nonlinear response of MTJ.

AB - The current-voltage (IV) characteristics beyond the linear response regime of magnetic tunnel junction (MTJ) is systematically investigated. We find a clear negative correlation between the two coefficients to characterize the linear (I∝V) and the lowest-order nonlinear (I∝V3) currents, which holds regardless of the temperature and the thickness of the tunnel barrier. This observation cannot simply be explained by the standard tunneling model such as the Brinkman model, suggesting a mechanism intrinsic to MTJ. We propose a phenomenological model based on the Jullire model that attributes the observed negative correlation to the spin-flip tunneling assisted by a magnon. These results suggest a fundamental law between the linear and the nonlinear response of MTJ.

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VL - 103

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JF - Physical Review B

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Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions

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