TY - JOUR
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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U2 - 10.1103/PhysRevB.103.245427
DO - 10.1103/PhysRevB.103.245427
M3 - Article
AN - SCOPUS:85108996231
SN - 2469-9950
VL - 103
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 24
M1 - 245427
ER -