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Electrically Induced Angular Momentum Flow between Separated Ferromagnets.

Richard Schlitz1, Matthias Grammer2,3, Tobias Wimmer2,3

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|July 12, 2024
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Summary
This summary is machine-generated.

Researchers demonstrate long-range angular momentum transport in metallic ferromagnets, isolating magnonic contributions. This breakthrough enables new spintronic devices without magnetic insulators.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Angular momentum conversion between electrons, magnons, and phonons is crucial for spintronics.
  • Current spintronic devices often rely on magnetic insulators, limiting applications.

Purpose of the Study:

  • To establish a new method for long-range angular momentum transport.
  • To isolate and study the magnonic contribution to spin transport in metallic ferromagnets.
  • To explore spintronic device concepts not reliant on magnetic insulators.

Main Methods:

  • Electrical excitation and detection of spin transport between two parallel ferromagnetic metal strips.
  • Utilizing charge-to-spin current conversion and inverse processes.
  • Investigating electron-magnon coupling for angular momentum transfer.

Main Results:

  • Observed finite angular momentum flow over micron distances between insulated ferromagnetic strips.
  • Demonstrated electrical detection of this long-range transport.
  • Provided experimental basis for separating electronic and magnonic spin transport.

Conclusions:

  • Phononic and dipolar interactions are likely mechanisms for inter-strip angular momentum transfer.
  • The study paves the way for magnonic device concepts using metallic ferromagnets.
  • Enables the development of advanced spintronic devices with enhanced functionality.