Title

Enhanced Magnetism in Highly Ordered Magnetite Nanoparticle-Filled Nanohole Arrays

Authors

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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