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Nanometric alternating magnetic field generator.

A P Espejo1, F Tejo2, N Vidal-Silva2

  • 1Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124, Santiago, Chile.

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|July 7, 2017
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Summary
This summary is machine-generated.

Researchers developed a novel alternating magnetic field generator using rotating magnetic domain walls in nanostructures. This technology, driven by spin-polarized currents, achieves GHz frequencies for potential use in telecommunications and nanodevices.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Magnetic domain walls (DWs) are fundamental to understanding magnetism in nanostructures.
  • Controlling DW dynamics is crucial for developing advanced magnetic devices.
  • Existing methods for generating alternating magnetic fields often lack nanoscale integration and tunability.

Purpose of the Study:

  • To introduce a novel alternating magnetic field generator based on rotating magnetic domain walls in cylindrical nanostructures.
  • To demonstrate the control over domain wall velocity and pinning position using spin-polarized currents and magnetic fields.
  • To explore the potential applications of this generator in telecommunications and nanodevices.

Main Methods:

  • Theoretical modeling and simulation of magnetic domain wall dynamics in a diameter-modulated nanowire.
  • Utilizing spin-polarized current and the intrinsic demagnetizing field to manipulate domain wall motion.
  • Analyzing the generation of alternating magnetic flux and induced electromotive force.

Main Results:

  • Successfully demonstrated the generation of an alternating magnetic field through the controlled rotation of a magnetic domain wall.
  • Achieved GHz frequency ranges by precisely controlling the domain wall's angular velocity and pinning position.
  • Showcased the influence of nanowire geometry and spin-polarized current on domain wall dynamics.

Conclusions:

  • The proposed device serves as an efficient alternating magnetic field generator at the nanoscale.
  • The technology offers a pathway for developing high-frequency components for telecommunications and novel voltage sources for nanodevices.
  • This work highlights the potential of engineered nanostructures for advanced magnetic field generation applications.