Exchange-Mediated Rotation Coherence in Magnetostrictive / Non-Magnetostrictive Strain-Coupled Multiferroics

ORAL

Abstract

Multiferroics are widely pursued, as such materials offer a multitude of exciting new device applications. There is a push to develop artificial composite multiferroics since there are few examples of natural multiferroics with room temperature functionality.[1] For strain-coupled multiferroics, voltage control of ferromagnetism can be achieved by interfacing piezoelectric and magnetostrictive materials. Functionality can be extended by exchange coupling the magnetostrictive material to a non-magnetostrictive magnet. Interfacing magnetostrictive Galfenol (Fe100-xGax; x=15-25) with low loss Permalloy (Ni80Fe20) on a PMN-PT substrate results in a strain-coupled system with the potential for quick-switching for high frequency applications. Polarized neutron reflectometry (PNR) was used to measure the electric field dependencies of the structural and magnetic depth profiles for a series of Ni80Fe20 / Fe100-xGax bilayers, and Fe100-xGax / Ni80Fe20 multilayer, grown on PMN-PT. These results are consistent with micromagnetic simulations which suggest a 5% deviation in rotation angle across the entire Fe100-xGax and Ni80Fe20 stack. Thus, we demonstrate coherent electric field response across tens of nm - an optimal range for device applications.

[1] Appl. Phys. Lett. 110, 242403 (2017)

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Presenters

  • Michelle Jamer

    • NIST
    • NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech

Authors

  • Michelle Jamer

    • NIST
    • NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech

  • Colin Rementer

    • Department of Chemical and Biomolecular Engineering, Unversity of California, Los Angeles

  • Anthony Barra

    • Department of Mechanical and Aerospace Engineering, UCLA
    • Univ of California - Los Angeles
    • Department of Mechanical and Aerospace Engineering, University of California, Los Angeles

  • Greg Carman

    • Department of Mechanical and Aerospace Engineering, UCLA
    • MAE Department, UCLA
    • Mechanical and Aerospace Engineering, University of California, Los Angeles
    • Mechanical and Aerospace Engineering Department, University of California, Los Angeles
    • Mechanical and Aerospace Engineering Department, Univ of California - Los Angeles
    • Univ of California - Los Angeles
    • Department of Mechanical and Aerospace Engineering, University of California, Los Angeles

  • Alexander Grutter

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards & Technology
    • NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech
    • NIST -Natl Inst of Stds & Tech

  • Daniel Gopman

    • NIST
    • Materials Science and Engineering Division, NIST -Natl Inst of Stds & Tech

  • Brian Kirby

    • NIST -Natl Inst of Stds & Tech
    • NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech
    • Center for Neutron Research, NIST

  • Julie Borchers

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards & Technology
    • NIST Center for Neutron Research, NIST -Natl Inst of Stds & Tech
    • NIST -Natl Inst of Stds & Tech
    • NIST Center for Neutron Research
    • NIST Center for Neutron Research, NIST

  • Jane Chang

    • Department of Chemical and Biomolecular Engineering, Unversity of California, Los Angeles