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ACS Nano. 2015 May 26;9(5):4814-26. doi: 10.1021/nn5056332. Epub 2015 May 7.

Electrically driven magnetic domain wall rotation in multiferroic heterostructures to manipulate suspended on-chip magnetic particles.

Author information

1
§Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.
2
∥Department of Physics, NYU Polytechnic School of Engineering, New York, New York 11201, United States.
3
⊥Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
4
#Institute of Physics, Johannes Gutenberg University, 55128 Mainz, Germany.
5
∇California NanoSystems Institute, Los Angeles, California 90095, United States.

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.

KEYWORDS:

electrically driven magnetic domain wall motion; energy-efficient magnetic technology; lab-on-a-chip; micromagnetic/elastodynamic coupled model; multiferroics

PMID:
25906195
DOI:
10.1021/nn5056332

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