Journal
ACS NANO
Volume 9, Issue 5, Pages 4814-4826Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5056332
Keywords
multiferroics; lab-on-a-chip; energy-efficient magnetic technology; micromagnetic/elastodynamic coupled model; electrically driven magnetic domain wall motion
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Funding
- National Science Foundation [EEC-1160504, NSF 11-537]
- NSF Center for Energy Efficient Electronics Science
- Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC02-05CH11231]
- EU [IFOX NMP3-LA-2010 246102]
- DFG
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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)O-3](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.
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