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    Improving Faraday rotation performance with block copolymer and FePt nanoparticle magneto-optical composite

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    ome-7-6-2126.pdf
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    Author
    Miles, Alexander
    Gai, Yue
    Gangopadhyay, Palash
    Wang, Xinyu
    Norwood, Robert A.
    Watkins, James J.
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2017-05-31
    
    Metadata
    Show full item record
    Publisher
    OPTICAL SOC AMER
    Citation
    Improving Faraday rotation performance with block copolymer and FePt nanoparticle magneto-optical composite 2017, 7 (6):2126 Optical Materials Express
    Journal
    Optical Materials Express
    Rights
    © 2017 Optical Society of America
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Magneto-optical (MO) composites with excellent Faraday rotation (FR) response were fabricated using iron platinum (FePt) nanoparticles (NPs) and polystyrene-block-poly (2-vinyl pyridine) (PS-b-P2VP) block copolymers (BCPs). Gallic acid functionalized FePt NPs with average core diameters (dcore) of 1.9, 4.9, 5.7 and 9.3 nm have been selectively incorporated into a P2VP domain through hydrogen bonding interactions. The use of copolymer templates to selectively arrange the magnetic NPs guaranteed high MO performance with little trade-off in terms of scattering loss, providing a simple strategy to prepare functional materials for MO applications. As a result, Verdet constants of a 10 wt % loaded 4.9 nm FePt NP composite reached absolute magnitudes as high as similar to-6 x 104 degrees/T-m at 845 nm, as determined by FR measurements at room temperature. At the same time, the MO figure-of-merit was as large as -25 degrees/T in these composites, indicating both excellent MO performance and transparency. The dependence of the nanocomposite FR properties on particle diameter, loading (from 0.1 wt % to 10 wt %) and composite nanostructure were systematically investigated at four infrared wavelengths (845, 980, 1310 and 1550 nm). (C) 2017 Optical Society of America
    Note
    Open access journal.
    ISSN
    2159-3930
    DOI
    10.1364/OME.7.002126
    Version
    Final published version
    Sponsors
    National Science Foundation (NSF) Center for Hierarchical Manufacturing [CMMI-1025020]
    Additional Links
    https://www.osapublishing.org/abstract.cfm?URI=ome-7-6-2126
    ae974a485f413a2113503eed53cd6c53
    10.1364/OME.7.002126
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