Magnetoelectric coupling in nanoscale 0-1 connectivity
Yan Zong1, Zhilian Yue, Pedro Martins
1ARC Centre for Electromaterials Science (ACES), Intelligent Polymer Research Institute/AIIM Faculty, Innovation Campus, Squires Way, University of Wollongong, NSW 2522, Australia. mhiggins@uow.edu.au.
Nanoscale
|September 12, 2018
Summary
Researchers discovered a new magnetoelectric (ME) coupling in 0-1 connectivity using self-assembling crystalline nanocellulose and cobalt ferrite nanoparticles. This novel composite shows significant ME voltage, advancing materials for electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Strain-mediated magnetoelectric (ME) coupling is crucial for advanced electronics.
- Existing ME composites utilize various connectivities, but new configurations are needed.
- Understanding factors governing ME composite performance is key for material discovery.
Purpose of the Study:
- To report a novel ME coupling in a 0-1 connectivity.
- To investigate the self-assembly of crystalline nanocellulose (CNC) and cobalt ferrite (CFO) nanoparticles for ME applications.
- To explore the ME response in binder-free CFO/CNC composites.
Main Methods:
- Fabrication of 0-1 ME composites using self-assembling 1D CNC nanowhiskers and 0D CFO nanoparticles.
- Modification of CFO nanoparticles with CTAB surfactant to control dispersion.
- Characterization of ME voltage coefficient (αME) and analysis of the ME response mechanism.
Main Results:
- A novel 0-1 ME coupling was successfully established in CFO/CNC composites without binders.
- The CFO/CNC composites exhibited a significant ME voltage coefficient (αME) up to 0.135 mV cm-1 Oe-1.
- CTAB-modified CFO/CNC composites showed an ME response attributed to the rearrangement of aggregated magnetic nanoparticles, distinct from typical magnetostriction effects.
Conclusions:
- The 0-1 connectivity offers a new pathway for developing high-performance ME composites.
- Self-assembling CNC provides an effective platform for integrating magnetic nanoparticles in ME devices.
- The observed ME mechanism in CTAB-CFO/CNC composites opens avenues for novel ME functionalities in nanomaterials.
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