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Electrically switchable van der Waals magnon valves.

Guangyi Chen1, Shaomian Qi1, Jianqiao Liu1

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.

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|November 2, 2021
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Summary
This summary is machine-generated.

Researchers created the first electrical van der Waals magnon valve using MnPS3. This device can switch magnon signals completely on and off, paving the way for magnon-based computing.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Van der Waals magnets offer tunable spin physics for advanced technologies.
  • Two-dimensional (2D) magnons are spin excitations confined in van der Waals materials.
  • A functional electrical 'magnon valve' for on/off control of magnon signals remains unrealized.

Purpose of the Study:

  • To demonstrate the first electrical van der Waals magnon valve.
  • To investigate the electrical control of 2D magnons in antiferromagnetic insulators.
  • To explore applications in magnon-based circuitry and future information technology.

Main Methods:

  • Fabrication of magnon valves using the van der Waals antiferromagnetic insulator MnPS3.
  • Application of DC electric current via a gate electrode to tune magnon signals.
  • Measurement of the second harmonic thermal magnon (SHM) signal to assess valve performance.

Main Results:

  • Demonstrated electrical tuning of the SHM signal from positive to negative, indicating a complete on/off switch.
  • Observed a guaranteed zero crossing during tuning, confirming the blocking of SHM transmission.
  • Attributed the switching behavior to the nonlinear gate dependence of non-equilibrium magnon density.

Conclusions:

  • Successfully realized a switchable van der Waals magnon valve based on MnPS3.
  • Showcased a magnon-based inverter utilizing the developed switchable valves.
  • Highlighted the potential of van der Waals antiferromagnets for tunable spin-wave physics and magnon-based circuits.