Enhanced Magnetism in Highly Ordered Magnetite Nanoparticle-Filled Nanohole Arrays

    Authors

    B. Duong; H. Khurshid; P. Gangopadhyay; J. Devkota; K. Stojak; H. Srikanth; L. Tetard; R. A. Norwood; N. Peyghambarian; M. H. Phan;J. Thomas

    Comments

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    Abbreviated Journal Title

    Small

    Keywords

    IRON-OXIDE NANOPARTICLES; CARBON NANOTUBES; FE3O4 NANOWIRES; FABRICATION; ABSORPTION; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter

    Abstract

    A new approach to develop highly ordered magnetite (Fe3O4) nanoparticle-patterned nanohole arrays with desirable magnetic properties for a variety of technological applications is presented. In this work, the sub-100 nm nanohole arrays are successfully fabricated from a pre-ceramic polymer mold using spin-on nanoprinting (SNAP). These nanoholes are then filled with monodispersed, spherical Fe3O4 nanoparticles of about 10 nm diameter using a novel magnetic drag and drop procedure. The nanohole arrays filled with magnetic nanoparticles are imaged using magnetic force microscopy (MFM). Magnetometry and MFM measurements reveal room temperature ferromagnetism in the Fe3O4-filled nanohole arrays, while the as-synthesized Fe3O4 nanoparticles exhibit superparamagnetic behavior. As revealed by MFM measurements, the enhanced magnetism in the Fe3O4-filled nanohole arrays originates mainly from the enhanced magnetic dipole interactions of Fe3O4 nanoparticles within the nanoholes and between adjacent nanoholes. Nanoparticle filled nanohole arrays can be highly beneficial in magnetic data storage and other applications such as microwave devices and biosensor arrays that require tunable and anisotropic magnetic properties.

    Journal Title

    Small

    Volume

    10

    Issue/Number

    14

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    2840

    Last Page

    2848

    WOS Identifier

    WOS:000340660900015

    ISSN

    1613-6810

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