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Related Experiment Videos

Magnetization noise in magnetoelectronic nanostructures.

Jørn Foros1, Arne Brataas, Yaroslav Tserkovnyak

  • 1Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway.

Physical Review Letters
|August 11, 2005
PubMed
Summary

Spin current noise in conductors amplifies magnetization noise through fluctuating spin-transfer torque. This effect, driven by Johnson-Nyquist and spin current shot noise, is more pronounced at lower temperatures.

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Area of Science:

  • Condensed matter physics
  • Spintronics

Background:

  • Spin current noise is a significant factor in magnetic phenomena.
  • Understanding noise contributions is crucial for spintronic device development.

Purpose of the Study:

  • To investigate the impact of spin current noise on magnetization noise.
  • To elucidate the mechanisms linking spin current noise to magnetization fluctuations.

Main Methods:

  • Utilizing scattering theory to model spin current noise.
  • Analyzing the contributions of Johnson-Nyquist noise and spin current shot noise.

Main Results:

  • Spin current noise increases magnetization noise via fluctuating spin-transfer torque.
  • Johnson-Nyquist noise correlates with Gilbert damping and spin pumping.

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  • Spin current shot noise dominates magnetization noise at low temperatures.

    • Conclusions:

    • Spin current noise is a key driver of magnetization noise in normal conductors coupled to ferromagnets.
    • The fluctuation-dissipation theorem explains the relationship between noise and damping.
    • Controlling spin current noise is essential for minimizing magnetization fluctuations in spintronic devices.