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