Multi-Ferroic Polymer Nanoparticle Composites for Next Generation Metamaterials
Abstract
Stretchable magneto-dielectric composites were prepared using collectively assembled iron oxide nanoclusters as fillers in an elastomer (polydimethylsiloxane) matrix. Raspberry-shaped nanoclusters (RSN) of iron oxides with different structures and compositions were synthesized by oriented aggregation of nanocrystals. This collectively assembled structure improved crystal quality and prevented the formation of surface and volume spin canting, leading to low coercivity iron oxide nanomaterials with enhanced saturation magnetization (Ms). The improved magnetization and low coercivity of the filler material allowed the fabrication of magneto-dielectric composites that can combine permeability values reaching 2.3 with magnetic loss values limited to 0.11. The resulting composites can also be stretched up to 165% strain before failure due to good adhesion between the elastomer and citrate capped RSNs. In addition, the composition of these fillers was altered to adjust the resonance frequency of the resulting composite material. Stretchable magneto-dielectric composites consisting of maghemite-rich RSNs and magnetite-rich RSNs demonstrated resonance frequencies similar to the spherical ferromagnetic resonance of maghemite and magnetite, respectively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 18, 2015
- Accession Number
- ADA636875
Entities
People
- Peter Kofinas
Organizations
- University of Maryland