Title

Enhanced Magnetism In Highly Ordered Magnetite Nanoparticle-Filled Nanohole Arrays

Keywords

magnetic force microscopy; magnetometry; nanohole arrays; nanoimprinting; SNAP

Abstract

A new approach to develop highly ordered magnetite (Fe3O 4) 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 a 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 a 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 Fe 3O4 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. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Publication Date

7-23-2014

Publication Title

Small

Volume

10

Issue

14

Number of Pages

2840-2848

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/smll.201303809

Socpus ID

84904428335 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84904428335

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