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Magnetostrictive thin films for microwave spintronics.

D E Parkes1, L R Shelford, P Wadley

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Summary
This summary is machine-generated.

Epitaxial Galfenol thin films exhibit bulk-like magnetostriction, enabling voltage-controlled tuning for advanced magnetic devices. These films offer enhanced magnetoelectric response and narrower linewidths for communication technologies.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Multiferroic composites are crucial for energy-efficient information and communication technology devices.
  • Thin ferromagnetic films often suffer from degraded magnetostriction and linewidths compared to bulk materials.
  • Epitaxial growth is key to overcoming thin-film limitations.

Purpose of the Study:

  • To develop epitaxial Galfenol (Fe81Ga19) thin films with superior magnetostriction and narrow microwave resonance linewidths.
  • To demonstrate voltage-induced strain for tuning magnetic anisotropy and microwave resonant frequency.
  • To enhance the magnetoelectric response in Galfenol thin films.

Main Methods:

  • Epitaxial thin film deposition of Galfenol (Fe81Ga19).
  • Characterization of magnetic properties, including magnetostriction and microwave resonance.
  • Measurement of magnetoelectric coupling and linewidths.

Main Results:

  • Achieved magnetostriction comparable to bulk Galfenol.
  • Demonstrated voltage-induced strain tuning of magnetic anisotropy and resonant frequency.
  • Observed enhanced magnetoelectric response and narrower linewidths than previously reported Galfenol thin films.

Conclusions:

  • Epitaxial Galfenol thin films possess excellent magnetostrictive properties suitable for device applications.
  • Voltage-controlled strain tuning offers a pathway for developing tunable magnetic devices.
  • These films are promising for magnetic information storage, processing, and microwave communications.