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Efficient electromagnetic transducers for spin-wave devices.

David A Connelly1, Gyorgy Csaba2, Hadrian Renaldo O Aquino3

  • 1Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA. dconnel7@nd.edu.

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Researchers developed a rapid design method for efficient sub-micron spin-wave transducers in microwave systems. This breakthrough enables low-power magnetic computing alternatives by improving microwave-to-spin-wave signal conversion.

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Area of Science:

  • Condensed Matter Physics
  • Microwave Engineering
  • Spintronics

Background:

  • Spin-wave circuits offer a potential low-power alternative to conventional electronics.
  • Limited understanding of microwave system-level design has hindered spin-wave circuit development.
  • Efficient microwave-to-spin-wave transduction is crucial for practical applications.

Purpose of the Study:

  • To present a system-level efficiency analysis for sub-micron spin-wave transducers.
  • To introduce a rapid design methodology for efficient spin-wave transducer systems.
  • To demonstrate the feasibility of high-efficiency microwave-to-spin-wave transduction.

Main Methods:

  • Developed an end-to-end microwave/spin-wave system model.
  • Utilized classical microwave network analysis and matching theory.
  • Compared magnetostatic-wave transducer theory with electromagnetic simulations.
  • Investigated different transducer designs, including microstrip, coplanar waveguide, grating, and meander lines.

Main Results:

  • Magnetostatic-wave transducer theory shows close agreement with simulations for rapid design.
  • Modified theory including exchange interaction is suitable for designing magnon transducers.
  • Meander line transducers offer high-efficiency and wideband performance compared to microstrip/coplanar waveguides.
  • A demonstrated meander transducer on Yttrium Iron Garnet (YIG) achieved -4.45 dB efficiency and 134 MHz bandwidth for launching 50 nm spin waves.

Conclusions:

  • Efficient microwave-to-spin-wave transducers are achievable.
  • The proposed analysis and design approach facilitate the development of spin-wave based computing and circuits.
  • This work paves the way for practical low-power spintronic devices.