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Related Experiment Videos

Current-induced transverse spin-wave instability in a thin nanomagnet.

M L Polianski1, P W Brouwer

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.

Physical Review Letters
|February 3, 2004
PubMed
Summary

An unpolarized electric current can trigger spin-wave instability in thin ferromagnets with asymmetric contacts. This current-induced spin-transfer torque effect is directional, occurring only for specific current flows.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Spin-transfer torque is a phenomenon where angular momentum is transferred from spin-polarized current to magnetic moments.
  • Exciting spin-wave instabilities is crucial for developing novel spintronic devices.

Purpose of the Study:

  • To investigate the excitation of spin-wave instability in thin ferromagnets using unpolarized electric currents.
  • To determine the conditions under which such an instability can be generated.

Main Methods:

  • Simulating current flow perpendicular to the plane of a thin ferromagnet.
  • Analyzing the effects of asymmetric source and drain contacts on spin dynamics.
  • Investigating the role of current-induced spin-transfer torque.

Main Results:

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  • An unpolarized electric current can excite a spin-wave instability.
  • The instability is transverse to the current direction.
  • Asymmetric contacts are essential for instability excitation.
  • The phenomenon is observed for only one direction of current flow.

Conclusions:

  • Current-induced spin-transfer torque can drive spin-wave instabilities in ferromagnets.
  • Device asymmetry is a key factor in achieving current-driven spin dynamics.
  • This finding opens possibilities for novel spintronic device functionalities.