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There has been a surge of interest in the field of multiferroic devices, which enable control of magnetism using voltage instead of the traditional method of current-based control of magnetism. This interest is spurred partly by the emergence of electric-field driven, stain-mediated magnetoelectric (ME) coupling in ferroelectric and ferromagnetic materials. This strain-mediated ME coupling is tunable by an applied electric field, at the core of designing new multiferroic devices, such as miniature antennas, nanoscale memories, magnetic field sensors, and motors. Our group has focused on understanding and utilizing the dynamics of magnetic domain of strain-mediated multiferroic materials, from both the modeling and experimental perspectives, with the goal of realizing a submicron multiferroic motor for a range of applications. Working jointly with researchers from the TANMS research center, we characterize the fundamental physical properties of our devices using the beamlines at the Advanced Light Source, Lawrence Berkeley National Laboratory. Collaborating with researchers from biomedical engineering, we work on navigating and precisely controlling magnetically-tagged cells and particles using these motor arrays in a microfluidic environment for localized capturing and sorting purposes.
During my Ph.D., I have gained expertise in design, modeling, fabrication, characterization and testing of composite multiferroic systems. I have conducted not only fundamental research work on complex material property characterization (including using different magnetometry methods and synchrotron x-ray beamline experiments to characterize magnetic and ferroelectric properties) but also application-based research of systems that integrate multiferroics and microfluidics (in close collaboration with material science and bioengineering researchers).
1. I worked on finite element simulation to compare the unidirectional and bidirectional coupled multiferroic models to show the nonnegligible importance of considering the bidirectional coupling in systems with increasingly popular highly magnetoelastic materials, such as Terfenol-D. The work is important for the research community which had been mainly using the simpler, unidirectional model to predict nanoscale multiferroic behavior.
2. On characterizing and improving the functionality of device components, I worked on four experimental projects.
a. Enhanced the magnetoelectric coupling in a strain-mediated multiferroic composite systems by interposing a polymer thin film between magnetoelastic layer and ferroelectric single crystal. The work reported a nearly two fold increase in the sensitivity of the remanent magnetization in the magnetic layer to an applied electric field.
b. Achieved tunable magnetoelastic effects in voltage-controlled exchange-coupled composite multiferroic microstructures with coupled magnetic bilayers. The findings are expected to be of great interest for the development of ultralow-power magnetoelectric memory devices. (Part of the work was also published in a conference paper -- 2018 PowerMEMS best paper finalist)
c. Investigated the influence of nonuniform micron-scale strain distributions on the electrical reorientation of magnetic microstructures in multiferroic devices. This collaborated work highlighted the importance of surface and interface engineering on small length scales, and introduced a robust method to characterize future devices on micron-scale.
d. Studied micro-strain distribution between patterned surface electrode arrays through x-ray microdiffraction and finite element simulations. The findings are relevant to the development of surface electrode based multiferroic devices with array-addressable localized strain control for applications including straintronic memory, probabilistic computing platforms, microwave devices, and magnetic-activated cell sorting platforms.
3. Multiferroics motor for cell and particle manipulation. Electrically controlled 20 um single magnetic domain Terfenol-D disks for cell manipulation, and micron-scale Ni and FeGa rings with nanoscale ring width for magnetic particle control
There has been a surge of interest in the field of multiferroic devices, which enable control of magnetism using voltage instead of the traditional method of current-based control of magnetism. This interest is spurred partly by the emergence of electric-field driven, stain-mediated magnetoelectric (ME) coupling in ferroelectric and ferromagnetic materials. This strain-mediated ME coupling is tunable by an applied electric field, at the core of designing new multiferroic devices, such as miniature antennas, nanoscale memories, magnetic field sensors, and motors. Our group has focused on understanding and utilizing the dynamics of magnetic domain of strain-mediated multiferroic materials, from both the modeling and experimental perspectives, with the goal of realizing a submicron multiferroic motor for a range of applications. Working jointly with researchers from the TANMS research center, we characterize the fundamental physical properties of our devices using the beamlines at the Advanced Light Source, Lawrence Berkeley National Laboratory. Collaborating with researchers from biomedical engineering, we work on navigating and precisely controlling magnetically-tagged cells and particles using these motor arrays in a microfluidic environment for localized capturing and sorting purposes.
During my Ph.D., I have gained expertise in design, modeling, fabrication, characterization and testing of composite multiferroic systems. I have conducted not only fundamental research work on complex material property characterization (including using different magnetometry methods and synchrotron x-ray beamline experiments to characterize magnetic and ferroelectric properties) but also application-based research of systems that integrate multiferroics and microfluidics (in close collaboration with material science and bioengineering researchers).
1. I worked on finite element simulation to compare the unidirectional and bidirectional coupled multiferroic models to show the nonnegligible importance of considering the bidirectional coupling in systems with increasingly popular highly magnetoelastic materials, such as Terfenol-D. The work is important for the research community which had been mainly using the simpler, unidirectional model to predict nanoscale multiferroic behavior.
2. On characterizing and improving the functionality of device components, I worked on four experimental projects.
a. Enhanced the magnetoelectric coupling in a strain-mediated multiferroic composite systems by interposing a polymer thin film between magnetoelastic layer and ferroelectric single crystal. The work reported a nearly two fold increase in the sensitivity of the remanent magnetization in the magnetic layer to an applied electric field.
b. Achieved tunable magnetoelastic effects in voltage-controlled exchange-coupled composite multiferroic microstructures with coupled magnetic bilayers. The findings are expected to be of great interest for the development of ultralow-power magnetoelectric memory devices. (Part of the work was also published in a conference paper -- 2018 PowerMEMS best paper finalist)
c. Investigated the influence of nonuniform micron-scale strain distributions on the electrical reorientation of magnetic microstructures in multiferroic devices. This collaborated work highlighted the importance of surface and interface engineering on small length scales, and introduced a robust method to characterize future devices on micron-scale.
d. Studied micro-strain distribution between patterned surface electrode arrays through x-ray microdiffraction and finite element simulations. The findings are relevant to the development of surface electrode based multiferroic devices with array-addressable localized strain control for applications including straintronic memory, probabilistic computing platforms, microwave devices, and magnetic-activated cell sorting platforms.
3. Multiferroics motor for cell and particle manipulation. Electrically controlled 20 um single magnetic domain Terfenol-D disks for cell manipulation, and micron-scale Ni and FeGa rings with nanoscale ring width for magnetic particle control
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Nano lettersno. 15 (2023): 6845-6851
Zhuyun Xiao, Chelsea Lai,Ruoda Zheng,Maite Goiriena-Goikoetxea,Nobumichi Tamura, Cornelio Torres Juarez, Colin Perry,Hanuman Singh,Jeffrey Bokor,Gregory P. Carman, Rob N. Candler
M. Goiriena-Goikoetxea,Z. Xiao,A. El-Ghazaly,C. V. Stan, J. Chatterjee, A. Ceballos, A. Pattabi, N. Tamura,R. Lo Conte,F. Hellman, R. Candler, J. Bokor
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