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Coherent microwave generation by spintronic feedback oscillator.

Dinesh Kumar1, K Konishi2, Nikhil Kumar3

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Researchers demonstrate a novel method to induce nanomagnet oscillations without spin torque. This new technique uses a magnetic tunnel junction (MTJ) and coplanar waveguide (CPW) feedback system for continuous precession and stable rf power output.

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Area of Science:

  • Spintronics
  • Nanomagnetism
  • Microwave Physics

Background:

  • Spin-transfer torque conventionally controls nanomagnetization.
  • Spin torque can induce magnetization oscillations with dc current and magnetic fields.
  • A new method for inducing nanomagnet oscillations without spin torque is explored.

Purpose of the Study:

  • To experimentally demonstrate a novel effect for driving nanomagnets into spontaneous oscillations.
  • To investigate a feedback mechanism involving a magnetic tunnel junction (MTJ) and a coplanar waveguide (CPW).
  • To achieve continuous precession of the free layer magnetization without spin torque.

Main Methods:

  • Utilizing a nano-pillar of a magnetic tunnel junction (MTJ) powered by a dc current.
  • Connecting the MTJ to a coplanar waveguide (CPW) positioned above the free layer.
  • Employing the tunneling magnetoresistance effect to convert magnetization fluctuations into oscillating voltage and inductive feedback via the CPW.

Main Results:

  • Demonstrated spontaneous oscillations in a nanomagnet without the need for spin torque.
  • Achieved continuous precession of the free layer magnetization through a feedback loop.
  • Observed stable radio frequency (rf) power output with a quality factor exceeding 10,000, similar to a laser system.

Conclusions:

  • A novel feedback mechanism can drive nanomagnets into continuous precession and oscillations.
  • The MTJ-CPW system offers a new pathway for generating stable rf power.
  • This effect provides an alternative to spin torque for controlling nanomagnet dynamics.