Abstract
We present a new type of magnetic nanoparticles for bioapplications. Multilayered nanodisks consisting of two magnetic layers separated by a non-magnetic layer with two capping layers were designed and fabricated. Two key magnetic requirements for bioapplications, a high saturation magnetic moment and a near-zero remanence, were achieved through the magnetostatic interlayer coupling between two magnetic layers. Capping layers provide functionalization sites for biomolecule attachment. A pillar-template-based synthesis method was employed for fabrication. Nanodisks with a diameter of 70 nm and a thickness of 60 nm were produced in large quantity. The magnetic characterization shows that each nanodisk possesses a magnetic moment equivalent to 100 10-nm Co nanoparticles and a near-zero remanent moment.
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Acknowledgment
This work was supported by the Research Enhancement Program at University of Texas at Arlington (UTA) and UTA-SPRING Joint Institutional Seed Research Program.
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Punnakitikashem, P., Chang, SH., Huang, CW. et al. Design and fabrication of non-superparamagnetic high moment magnetic nanoparticles for bioapplications. J Nanopart Res 12, 1101–1106 (2010). https://doi.org/10.1007/s11051-009-9761-4
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DOI: https://doi.org/10.1007/s11051-009-9761-4