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Researchers excited orbital angular momentum magnon modes in magnetic crystals using microwaves, inducing mechanical torque. This spinning effect in a YIG microsphere reached speeds over 10 GHz.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Magnonics

Background:

  • Magnons are collective spin excitations in magnetic crystals.
  • They exhibit strong coupling with microwaves and quantum systems.
  • Orbital angular momentum (OAM) in magnonic modes is of significant interest.

Purpose of the Study:

  • To investigate the existence and properties of OAM magnon modes in magnetic crystals.
  • To demonstrate the excitation of these modes using linearly polarized microwave fields.
  • To explore the mechanical effects of exciting OAM magnon modes.

Main Methods:

  • Theoretical analysis of magnonic modes in compact magnetic crystals.
  • Experimental setup using a levitated yttrium iron garnet (YIG) microsphere.
  • Driving OAM magnon modes with microwaves inside a high-Q microwave cavity.

Main Results:

  • Identified magnonic modes supporting orbital angular momentum in magnetic crystals.
  • Successfully excited these OAM magnon modes using linearly polarized microwave fields.
  • Observed a significant mechanical torque on the YIG microsphere due to angular momentum conservation.
  • Achieved ultra-large angular speeds exceeding 10 GHz in the levitated YIG sphere.

Conclusions:

  • Orbital angular momentum magnon modes can be excited by microwave fields, leading to observable mechanical effects.
  • Levitated magnetic crystals offer a platform to study and utilize these spin-driven mechanical torques.
  • This work opens avenues for novel quantum technologies and spintronic devices.