Non-Uniform Strain-Driven Magnetic Domain Wall Motion in PMN-PT/Ni Microstructures

POSTER

Abstract

Strain-mediated multiferroic hetero-structures are of great interest since they offer a possible path towards high energy-efficient magnetic memory and logic devices. In this simulation work, a finite difference model is developed to study the strain induced magnetic domain wall (DW) motion in micron size Ni squares onto a PMN-PT substrate. The analysis consists of solving the coupled micromagnetic with elastodynamics. In the model, a non-uniform strain is introduced inside the Ni squares in order to reproduce real devices’ conditions. Initially a magnetic Landau flux-closure state is formed in Ni structures. As an electric field is applied generating compressive strain along the diagonal of the Ni square, a two-domain state forms consisting of two anti-parallel magnetic domains, separated by a DW. A further increase of the electric field produces a lateral motion of the DW. Such DW motion is understood as a result of the minimization of its energy. Good agreement with experimental result is produced by the model. This model helps to better understand the strain-induced magnetic reorientation and DW motion in real multiferroic systems.

Presenters

  • Cai Chen

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

Authors

  • Cai Chen

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

  • Roberto Lo Conte

    • Department of Electrical Engineering and Computer Science, University of California, Berkeley

  • Michael Cui

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

  • Jeffrey Bokor

    • University of California
    • EECS, UC Berkeley
    • Department of Electrical Engineering and Computer Science, University of California, Berkeley
    • EECS, University of California Berkeley

  • 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

  • Abdon Sepulveda

    • 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