Time-Resolved Switching Characteristic in Magnetic Tunnel Junction with Spin Transfer Torque Write Scheme

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概要

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• The time-resolved switching characteristics of 100\times 200 nm2 size CoFeB/MgO/CoFeB-based magnetic tunnel junction (MTJ) are investigated by using the 20 GHz sampling measurement technique. We focused on the physical quantities of the time-resolved characteristics such as incubation time t_{\text{A}}, transit time t_{\text{B}}, and the standard deviations \sigma V's of the period of the switching waveform. Furthermore, the dependencies of t_{\text{A}} and t_{\text{B}} on the applied pulse waveforms are analyzed. We found t_{\text{A}} exponentially decreases as the applied voltage to MTJ increases, while t_{\text{B}} remains less than two nano seconds regardless of the applied voltage. Furthermore, it is observed that the standard deviations of the waveform during t_{\text{A}} is larger than that of the other periods. Finally, we discuss the switching characteristics with proposed toy model based on spin transfer torque (STT) phenomena.

• 2012-02-25

著者

• Endoh Tetsuo

  Center For Interdisciplinary Research Tohoku University

• Ohno Hideo

  Center For Spintronics Integrated Systems Tohoku University

• Ikeda Shoji

  Center For Spintronics Integrated Systems Tohoku University

• Hanyu Takahiro

  Center for Spintronics Integrated Systems, Tohoku University, Sendai 980-8577, Japan

• Iga Fumitaka

  Center for Interdisciplinary Research, Tohoku University, Sendai 980-8578, Japan

• Yoshida Yasuhiro

  Center for Interdisciplinary Research, Tohoku University, Sendai 980-8578, Japan

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