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.