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