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Magnetic Tweezers for the Measurement of Twist and Torque
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Spin torque oscillations triggered by in-plane field.

R Arun1, R Gopal2, V K Chandrasekar2

  • 1Department of Nonlinear Dynamics, School of Physics, Bharathidasan University, Tiruchirapalli-620024, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 21, 2021
PubMed
Summary
This summary is machine-generated.

A short magnetic field pulse can initiate self-oscillations in spin torque nano-oscillators. Current and field-like torque tune oscillation frequency, with the system showing stability against thermal noise.

Keywords:
high-frequency oscillationsnonlinear dynamicsspin transfer torque, magnetization dynamics, self-oscillation, frequency and powerspintronics

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Nonlinear Dynamics

Background:

  • Spin torque nano-oscillators (STNOs) are crucial for microwave signal generation.
  • Understanding their dynamic behavior under external stimuli is essential for device optimization.
  • Parallel magnetization configurations present unique dynamic characteristics.

Purpose of the Study:

  • To investigate the dynamic response of a parallelly magnetized STNO to pulsed magnetic fields.
  • To explore the tunability of oscillation frequency by electrical current and field-like torque.
  • To analyze the impact of thermal noise on STNO stability and dynamics.

Main Methods:

  • Numerical solution of the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation.
  • Simulation of STNO dynamics under pulsed in-plane magnetic fields.
  • Analysis of oscillation frequency, Q-factor, and thermal stability.

Main Results:

  • A short in-plane magnetic field pulse (<1 ns) can trigger self-oscillations from a low-energy state.
  • Oscillation frequency is tunable from ~25 GHz to ~72 GHz via current, independent of field-like torque.
  • Field-like torque enhances frequency by up to 10 GHz; Q-factor increases with frequency.
  • The system demonstrates stability against thermal noise, with dynamics minimally affected.

Conclusions:

  • Pulsed magnetic fields offer a viable method for initiating STNO oscillations.
  • Precise control over oscillation frequency is achievable through current and field-like torque.
  • The studied STNO exhibits robust performance, stable under realistic thermal conditions.