Investigation of Diverse Magnetic Materials via Acoustically Driven Ferromagnetic Resonance

ORAL

Abstract

Magnetoelastic coupling has been exploited to detect FMR using surface acoustic waves(SAWs), a technique known as ADFMR. GHz-frequency SAWs are produced and detected electrically using pairs of interdigital transducers(IDTs). A magnetic film is placed in the path of the SAWs, which can then interact with magnetic moments via magnetoelastic coupling. Absorption of the SAWs occurs at FMR, modulating the measured output. Landau-Lifshitz-Gilbert theory describes the interaction in terms of the external magnetic field with a characteristic four-lobe pattern, from which the magnetic anisotropy field, FMR resonance field, and magnetoelastic coupling coefficient can be inferred.
We study the effects of a variety of magnetic materials including Ni, FeCo, FeGaB, and FeCoSiB, to examine the dependence of ADFMR patterns on material parameters and geometries. We use a range of SAW frequencies from ~300 to 2000 MHz to explore spectral effects of the IDT design on transduction efficiency, and the frequency dependence of the resonance field. We also calculate the FMR linewidth and quality factor- figures of merit useful for determining the efficacy of future ADFMR devices.

*This material is based on work supported by the Air Force Office of Scientific Research under project number FA9550-15RXCOR198

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Presenters

  • Michael Page

    • Materials and Manufacturing Directorate, Air Force Research Laboratory

Authors

  • Piyush Shah

    • Materials and Manufacturing Directorate, Air Force Research Laboratory

  • Derek Bas

    • Materials and Manufacturing Directorate, Air Force Research Laboratory

  • Vladimir Safonov

    • Materials and Manufacturing Directorate, Air Force Research Laboratory

  • Maksym Popov

    • Department of Physics, Oakland University

  • Alexei Matyushov

    • Department of Electrical and Computer Engineering, Northeastern University

  • Anne Kittmann

    • Institute for Materials Science, Chair for Inorganic Functional Materials, Kiel University, D-24143 Kiel, Germany

  • Viktor Schell

    • Institute for Materials Science, Chair for Inorganic Functional Materials, Kiel University, D-24143 Kiel, Germany

  • Eckhard Quandt

    • Institute for Materials Science, Chair for Inorganic Functional Materials, Kiel University, D-24143 Kiel, Germany

  • Nian Xiang Sun

    • Electrical and Computer Engineering, Northeastern University
    • College of Engineeing, Northeastern University
    • Northeastern University
    • Electrical Engineering, Northeastern University
    • Department of Electrical and Computer Engineering, Northeastern University

  • Gopalan Srinivasan

    • Department of Physics, Oakland University

  • Brandon Howe

    • Materials and Manufacturing Directorate, Air Force Research Laboratory
    • Air Force Research Laboratory

  • Michael E McConney

    • Materials and Manufacturing Directorate, Air Force Research Laboratory

  • Michael Page

    • Materials and Manufacturing Directorate, Air Force Research Laboratory