Enhanced Magnetism in Highly Ordered Magnetite Nanoparticle-Filled Nanohole Arrays

被引：37

作者：

Binh Duong ^{[1
]}

Khurshid, Hafsa ^{[2
]}

Gangopadhyay, Palash ^{[3
]}

Devkota, Jagannath ^{[2
]}

Stojak, Kristen ^{[2
]}

Srikanth, Hariharan ^{[2
]}

Tetard, Laurene ^{[1
]}

Norwood, Robert A. ^{[3
]}

Peyghambarian, N. ^{[3
]}

Manh-Huong Phan ^{[2
]}

Thomas, Jayan ^{[1
]}

机构：

[1] Univ Cent Florida, NanoSci Technol Ctr, Orlando, FL 32826 USA

[2] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[3] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA

来源：

SMALL | 2014年 / 10卷 / 14期

基金：

美国国家科学基金会;

关键词：

IRON-OXIDE NANOPARTICLES; FABRICATION; ABSORPTION;

D O I：

10.1002/smll.201303809

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：2840 / 2848

页数：9

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