JSTS:Journal of Semiconductor Technology and Science

  • 제13권6호
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  • Pages.556-561
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  • 2013
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  • 1598-1657(pISSN)
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  • 2233-4866(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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Advanced Circuit-Level Model of Magnetic Tunnel Junction-based Spin-Torque Oscillator with Perpendicular Anisotropy Field

  • Kim, Miryeon (Department of Electronics Engineering, Ewha Womans University) ;
  • Lim, Hyein (Department of Electronics Engineering, Ewha Womans University) ;
  • Ahn, Sora (Department of Electronics Engineering, Ewha Womans University) ;
  • Lee, Seungjun (Department of Electronics Engineering, Ewha Womans University) ;
  • Shin, Hyungsoon (Department of Electronics Engineering, Ewha Womans University)
  • 투고 : 2013.05.07
  • 심사 : 2013.10.28
  • 발행 : 2013.12.31
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초록

Interest in spin-torque oscillators (STOs) has been increasing due to their potential use in communication devices. In particular the magnetic tunnel junction-based STO (MTJ-STO) with high perpendicular anisotropy is gaining attention since it can generate high output power. In this paper, a circuit-level model for an in-plane magnetized MTJ-STO with partial perpendicular anisotropy is proposed. The model includes the perpendicular torque and the shift field for more accurate modeling. The bias voltage dependence of perpendicular torque is represented as quadratic. The model is written in Verilog-A, and simulated using HSPICE simulator with a current-mirror circuit and a multi-stage wideband amplifier. The simulation results show the proposed model can accurately replicate the experimental data such that the power increases and the frequency decreases as the value of the perpendicular anisotropy gets close to the value of the demagnetizing field.

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참고문헌

  1. D. Houssamedine, et al., "Spin Transfer Induced Coherent Microwave Emission with Large Power from Nanoscale MgO Tunnel Junctions," Appl. Phys. Lett., vol. 93, p. 022505, 2008. https://doi.org/10.1063/1.2956418
  2. Zhongming Zeng, et al., "High-power coherent microwave emission from magnetic tunnel junction nano-oscillators with perpendicular anisotropy," ACS Nano, vol. 6 (7), p. 6115, 2012. https://doi.org/10.1021/nn301222v
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  6. Se-Chung Oh, et al., "Bias-voltage dependence of perpendicular spin-transfer torque in asymmetric MgO-based magnetic tunnel junctions," Nature Phys., vol. 5, p. 898, 2009. https://doi.org/10.1038/nphys1427
  7. A. Slavin, et al., " Nonlinear auto-oscillator theory of microwave generation by spin-polarized current," IEEE Trans. Magn., vol. 45, No. 4, p. 1875, 2009. https://doi.org/10.1109/TMAG.2008.2009935
  8. Hyein Lim, et al., "A new circuit model for spintorque oscillator including the perpendicular torque of magnetic tunnel junction," ICM, 2012.

피인용 문헌

  1. Comprehensive and Macrospin-Based Magnetic Tunnel Junction Spin Torque Oscillator Model-Part I: Analytical Model of the MTJ STO vol.62, pp.3, 2015, https://doi.org/10.1109/TED.2015.2390411
  2. Comprehensive and Macrospin-Based Magnetic Tunnel Junction Spin Torque Oscillator Model- Part II: Verilog-A Model Implementation vol.62, pp.3, 2015, https://doi.org/10.1109/TED.2015.2390676
  3. Spin-Torque and Spin-Hall Nano-Oscillators vol.104, pp.10, 2016, https://doi.org/10.1109/JPROC.2016.2554518