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Magnetic Domain Wall Floating on a Spin Superfluid.

Pramey Upadhyaya1, Se Kwon Kim1, Yaroslav Tserkovnyak1

  • 1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.

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We explored angular momentum transfer between a spin superfluid and a domain wall in magnetic insulators. This research enables new possibilities for soliton-based memory and logic devices by controlling domain wall motion.

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Magnonics

Background:

  • Spin superfluids exhibit dissipationless spin transport.
  • Domain walls in magnetic insulators can be manipulated by spin currents.
  • Understanding angular momentum transfer is crucial for spintronic devices.

Purpose of the Study:

  • To theoretically investigate angular momentum transfer between a spin superfluid and a domain wall.
  • To derive analytical expressions for superfluid-mediated domain wall motion.
  • To propose a reconfigurable spin transistor based on this phenomenon.

Main Methods:

  • Theoretical analysis of angular momentum transfer in an exchange-coupled magnetic insulator system.
  • Derivation of analytical expressions for domain wall motion.
  • Validation of analytical results using micromagnetic simulations.

Main Results:

  • A domain wall in an easy-axis magnet absorbs spin angular momentum from a spin superfluid in an easy-plane magnet.
  • Analytical expressions for superfluid-mediated domain wall motion were derived.
  • The phenomenon extends magnon-driven domain wall motion to superfluid regimes.

Conclusions:

  • The study demonstrates a novel mechanism for domain wall manipulation using spin superfluids.
  • The proposed phenomenon can be exploited for reconfigurable spin transistors and soliton-based devices.
  • Dissipationless spin superfluids offer a pathway for advanced memory and logic applications.