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Highly efficient in-line magnetic domain wall injector.

Timothy Phung1, Aakash Pushp, Luc Thomas

  • 1IBM Almaden Research Center , San Jose, California United States.

Nano Letters
|January 14, 2015
PubMed
Summary

Researchers developed a simple method to inject domain walls into magnetic nanowires using spin transfer torque and magnetic fields. This new technique requires significantly lower currents than traditional approaches, making magnetic devices more efficient.

Keywords:
Spintronicsdomain wall dynamicsdomain wall injectionmagnetic nanowiresracetrack memoryspin transfer torque

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Area of Science:

  • Spintronics
  • Materials Science
  • Nanotechnology

Background:

  • Domain walls in magnetic nanowires are crucial for data storage and processing.
  • Conventional methods for domain wall injection are often inefficient and require high currents.

Purpose of the Study:

  • To demonstrate a novel and highly efficient scheme for injecting domain walls into magnetic nanowires.
  • To reduce the current required for domain wall injection compared to existing methods.

Main Methods:

  • Utilizing spin transfer torque from nanosecond-long, unipolar current pulses.
  • Leveraging fringing magnetic fields present at a 90° magnetization boundary.
  • Implementing an "in-line" domain wall injection strategy.

Main Results:

  • Successfully injected single domain walls and continual streams of domain walls.
  • Achieved domain wall injection with currents at least 100 times smaller than conventional methods.
  • Demonstrated a highly efficient and simple injection scheme.

Conclusions:

  • The developed "in-line" domain wall injection scheme offers a significant improvement in efficiency and reduced current requirements.
  • This method has the potential to enable more energy-efficient spintronic devices.
  • The simplicity of the scheme facilitates practical implementation in magnetic nanowire-based technologies.