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Related Experiment Videos

Ballistic anisotropic magnetoresistance.

J Velev1, R F Sabirianov, S S Jaswal

  • 1Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0111, USA.

Physical Review Letters
|May 21, 2005
PubMed
Summary

Ballistic anisotropic magnetoresistance in ferromagnetic conductors changes conductance with magnetization direction. This effect, driven by spin-orbit interaction, was confirmed in nickel and iron nanowires.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Ferromagnetic materials exhibit unique electronic properties influenced by electron spin.
  • Ballistic transport occurs when electrons travel without scattering, preserving quantum coherence.
  • Anisotropic magnetoresistance (AMR) is a phenomenon where resistance changes with magnetization direction.

Purpose of the Study:

  • To investigate ballistic anisotropic magnetoresistance (BAMR) in ferromagnetic nanowires.
  • To understand the role of spin-orbit interaction in BAMR.
  • To computationally verify BAMR in nickel and iron nanowires.

Main Methods:

  • Ab initio electronic structure calculations.
  • Ballistic transport simulations.
  • Density Functional Theory (DFT) based methods.

Main Results:

  • Predicted and confirmed sizable ballistic anisotropic magnetoresistance in Ni and Fe nanowires.
  • Demonstrated that BAMR arises from changes in band structure due to spin-orbit interaction.
  • Observed significant conductance changes when altering magnetization from parallel to perpendicular to the wire axis.

Conclusions:

  • Ballistic anisotropic magnetoresistance is a significant phenomenon in ferromagnetic ballistic conductors.
  • Spin-orbit interaction is crucial for understanding BAMR.
  • Ab initio calculations provide a reliable method for predicting BAMR in nanostructures.

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