Electric-field induced nonlinear ferromagnetic resonance in a CoFeB/MgO magnetic tunnel junction

E. Hirayama; S. Kanai; J. Ohe; H. Sato; F. Matsukura; H. Ohno

doi:10.1063/1.4932092

Electric-field induced nonlinear ferromagnetic resonance in a CoFeB/MgO magnetic tunnel junction

E. Hirayama, S. Kanai, J. Ohe, H. Sato, F. Matsukura, H. Ohno

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

15 Citations (Scopus)

Abstract

We investigate the rf power dependence of homodyne-detected ferromagnetic resonance (FMR) spectra of a nanoscale CoFeB/MgO magnetic tunnel junction, in which the FMR is induced by the electric-field modulation of the magnetic anisotropy. The increase of the rf power changes the spectral lineshape and decreases characteristic frequency, at which drastic change in spectrum is observed. The behavior is consistent with nonlinear magnetization precession with a large precessional angle at high powers. From the rf power dependence of FMR spectra, we determine electric-field modulation ratio of magnetic anisotropy energy density to be 78 fJ/Vm, which is in agreement with the reported values.

Original language	English
Article number	132404
Journal	Applied Physics Letters
Volume	107
Issue number	13
DOIs	https://doi.org/10.1063/1.4932092
Publication status	Published - 2015 Sept 28

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "We investigate the rf power dependence of homodyne-detected ferromagnetic resonance (FMR) spectra of a nanoscale CoFeB/MgO magnetic tunnel junction, in which the FMR is induced by the electric-field modulation of the magnetic anisotropy. The increase of the rf power changes the spectral lineshape and decreases characteristic frequency, at which drastic change in spectrum is observed. The behavior is consistent with nonlinear magnetization precession with a large precessional angle at high powers. From the rf power dependence of FMR spectra, we determine electric-field modulation ratio of magnetic anisotropy energy density to be 78 fJ/Vm, which is in agreement with the reported values.",

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AU - Hirayama, E.

AU - Kanai, S.

AU - Ohe, J.

AU - Sato, H.

AU - Matsukura, F.

AU - Ohno, H.

PY - 2015/9/28

Y1 - 2015/9/28

N2 - We investigate the rf power dependence of homodyne-detected ferromagnetic resonance (FMR) spectra of a nanoscale CoFeB/MgO magnetic tunnel junction, in which the FMR is induced by the electric-field modulation of the magnetic anisotropy. The increase of the rf power changes the spectral lineshape and decreases characteristic frequency, at which drastic change in spectrum is observed. The behavior is consistent with nonlinear magnetization precession with a large precessional angle at high powers. From the rf power dependence of FMR spectra, we determine electric-field modulation ratio of magnetic anisotropy energy density to be 78 fJ/Vm, which is in agreement with the reported values.

AB - We investigate the rf power dependence of homodyne-detected ferromagnetic resonance (FMR) spectra of a nanoscale CoFeB/MgO magnetic tunnel junction, in which the FMR is induced by the electric-field modulation of the magnetic anisotropy. The increase of the rf power changes the spectral lineshape and decreases characteristic frequency, at which drastic change in spectrum is observed. The behavior is consistent with nonlinear magnetization precession with a large precessional angle at high powers. From the rf power dependence of FMR spectra, we determine electric-field modulation ratio of magnetic anisotropy energy density to be 78 fJ/Vm, which is in agreement with the reported values.

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Electric-field induced nonlinear ferromagnetic resonance in a CoFeB/MgO magnetic tunnel junction

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