Self-Assembly of Magnetic Ni Nanoparticles into 1D Arrays with Antiferromagnetic Order

Authors

Valery Bliznyuk, Western Michigan University
Srikanth Singamaneni, Western Michigan UniversityFollow
Sarbeswar Sahoo, University of Nebraska, LincolnFollow
Srinivas Polisetty, University of Nebraska, LincolnFollow
Xi He, University of Nebraska, LincolnFollow
Christian Binek, University of Nebraska, LincolnFollow

Document Type

Article

Date of this Version

2009

Comments

Published in Nanotechnology 20 (2009), 105606 (8pp); doi 10.1088/0957-4484/20/10/105606 Copyright © 2009 IOP Publishing Ltd. Used by permission. http://stacks.iop.org/Nano/20/105606

Abstract

In this paper, we report on the magnetic properties of isolated nanoparticles and interacting nanochains formed by the self-assembly of Ni nanoparticles. The magnetic properties were studied using superconducting quantum interference device (SQUID) magnetometry and magnetic force microscopy (MFM). We demonstrate that single-domain Ni nanoparticles spontaneously form one-dimensional (1D) chains under the influence of an external magnetic field. Furthermore, such magnetic field-driven self-assembly in conjunction with surface templating produces regular arrays of 1D nanochains with antiferromagnetic intra-chain order. The antiferromagnetic order, which is in striking contrast to what is found for non-interacting nanoparticle assemblies within the chains, can be evidenced from MFM and SQUID measurements.