Spin-Torque Diode Measurements of MgO-Based Magnetic Tunnel Junctions with Asymmetric Electrodes

R. Matsumoto; A. Chanthbouala; J. Grollier; V. Cros; A. Fert; K. Nishimura; Y. Nagamine; H. Maehara; K. Tsunekawa; A. Fukushima; S. Yuasa

doi:10.1143/APEX.4.063001

Spin-Torque Diode Measurements of MgO-Based Magnetic Tunnel Junctions with Asymmetric Electrodes

Materials Science 2016-12-22 v1

Authors: R. Matsumoto , A. Chanthbouala , J. Grollier , V. Cros , A. Fert , K. Nishimura , Y. Nagamine , H. Maehara , K. Tsunekawa , A. Fukushima , S. Yuasa

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Abstract

We present a detailed study of the spin-torque diode effect in CoFeB/MgO/CoFe/NiFe magnetic tunnel junctions. From the evolution of the resonance frequency with magnetic field at different angles, we clearly identify the free-layer mode and find an excellent agreement with simulations by taking into account several terms for magnetic anisotropy. Moreover, we demonstrate the large contribution of the out-of-plane torque in our junctions with asymmetric electrodes compared to the in-plane torque. Consequently, we provide a way to enhance the sensitivity of these devices for the detection of microwave frequency.

Keywords

spin-torque diode magnetic tunnel junction asymmetric electrodes out-of-plane torque microwave detection CoFeB/MgO/CoFe/NiFe

Cite

@article{arxiv.1103.3207,
  title  = {Spin-Torque Diode Measurements of MgO-Based Magnetic Tunnel Junctions with Asymmetric Electrodes},
  author = {R. Matsumoto and A. Chanthbouala and J. Grollier and V. Cros and A. Fert and K. Nishimura and Y. Nagamine and H. Maehara and K. Tsunekawa and A. Fukushima and S. Yuasa},
  journal= {arXiv preprint arXiv:1103.3207},
  year   = {2016}
}

Spin-Torque Diode Measurements of MgO-Based Magnetic Tunnel Junctions with Asymmetric Electrodes

Abstract

Keywords

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