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Voltage controlled on-demand magnonic nanochannels.

Samiran Choudhury1, Avinash Kumar Chaurasiya1, Amrit Kumar Mondal1

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Researchers created dynamic magnonic nanochannels (MNCs) using electric fields. These energy-efficient channels enable on-demand control of spin waves (SWs), paving the way for advanced on-chip data processing.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Energy-efficient on-chip data communication and processing are crucial for next-generation computing.
  • Magnonic nanochannels (MNCs) offer potential for novel data transmission, but require dynamic control.
  • Tailoring magnetic properties on demand is key to realizing functional magnonic devices.

Purpose of the Study:

  • To develop a dynamic magnonic nanochannel (MNC) array with electrically tunable properties.
  • To investigate the spin wave (SW) dispersion and bandgap formation in these dynamically controlled MNCs.
  • To demonstrate the feasibility of on-demand control of magnonic properties for data processing applications.

Main Methods:

  • Fabrication of Ta/CoFeB/MgO/Al2O3 heterostructures with indium tin oxide electrodes.
  • Application of static electric fields to tailor perpendicular magnetic anisotropy at the CoFeB/MgO interface.
  • Brillouin light scattering spectroscopy to probe spin wave dispersion and bandgaps.
  • Numerical calculations using the plane wave method to simulate SW propagation and mode profiles.

Main Results:

  • Observation of magnonic bands with two spin wave (SW) frequency modes and an emergent bandgap under applied gate voltage.
  • Demonstration that the magnonic bandgap can be switched on and off by applying or removing the gate voltage.
  • Experimental results are accurately reproduced by numerical simulations, showing propagating SWs through nanochannels.
  • Anticrossing between the two SW modes is identified as the mechanism responsible for the observed magnonic bandgap.

Conclusions:

  • A dynamic MNC array with electrically tunable magnonic properties has been successfully developed.
  • The electric field provides an effective method for on-demand control of spin wave propagation and bandgaps in MNCs.
  • These findings represent a significant step towards energy-efficient, on-demand magnonic devices for future on-chip data communication and processing.