title: Electrically driven magnetic domain wall rotation in multiferroic heterostructures to manipulate suspended on-chip magnetic particles.
abstract: In this work, we experimentally demonstrate deterministic electrically driven, strain-mediated domain wall (DW) rotation in ferromagnetic Ni rings fabricated on piezoelectric [Pb(Mg1/3Nb2/3)O3]0.66-[PbTiO3]0.34 (PMN-PT) substrates. While simultaneously imaging the Ni rings with X-ray magnetic circular dichroism photoemission electron microscopy, an electric field is applied across the PMN-PT substrate that induces strain in the ring structures, driving DW rotation around the ring toward the dominant PMN-PT strain axis by the inverse magnetostriction effect. The DW rotation we observe is analytically predicted using a fully coupled micromagnetic/elastodynamic multiphysics simulation, which verifies that the experimental behavior is caused by the electrically generated strain in this multiferroic system. Finally, this DW rotation is used to capture and manipulate micrometer-scale magnetic beads in a fluidic environment to demonstrate a proof-of-concept energy-efficient pathway for multiferroic-based lab-on-a-chip applications.
authors.forename: Hyunmin
authors.initials: H
authors.lastname: Sohn
authors.affiliation: §Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Nowakowski
authors.forename: Cheng-yen
authors.initials: CY
authors.lastname: Liang
authors.forename: Joshua L
authors.initials: JL
authors.lastname: Hockel
authors.forename: Kyle
authors.initials: K
authors.lastname: Wetzlar
authors.forename: Scott
authors.initials: S
authors.lastname: Keller
authors.affiliation: ∥Department of Physics, NYU Polytechnic School of Engineering, New York, New York 11201, United States.
authors.forename: Brenda M
authors.initials: BM
authors.lastname: McLellan
authors.affiliation: ⊥Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Marcus
authors.affiliation: ⊥Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Andrew
authors.initials: A
authors.lastname: Doran
authors.affiliation: ⊥Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Anthony
authors.initials: A
authors.lastname: Young
authors.affiliation: #Institute of Physics, Johannes Gutenberg University, 55128 Mainz, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Kläui
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Carman
authors.affiliation: §Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Bokor
authors.affiliation: ∇California NanoSystems Institute, Los Angeles, California 90095, United States.
authors.forename: Robert N
authors.initials: RN
authors.lastname: Candler
keywords: electrically driven magnetic domain wall motion; energy-efficient magnetic technology; lab-on-a-chip; micromagnetic/elastodynamic coupled model; multiferroics