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Journal of Nanomaterials
Volume 2017 (2017), Article ID 5046076, 6 pages
https://doi.org/10.1155/2017/5046076
Research Article

Influence of the Distance between Nanoparticles in Clusters on the Magnetization Reversal Process

1Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, Interaktion 1, 33619 Bielefeld, Germany
2Institute of Physics-Center for Science and Education, Silesian University of Technology, Ul. Konarskiego 22B, 44-100 Gliwice, Poland

Correspondence should be addressed to Andrea Ehrmann

Received 27 March 2017; Accepted 12 July 2017; Published 20 August 2017

Academic Editor: Anil Annadi

Copyright © 2017 Andrea Ehrmann and Tomasz Blachowicz. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fourfold magnetic nanoparticles, created from nanowires or in the form of an open square, offer the possibility of creating quaternary memory devices with four unambiguously distinguishable stable states at remanence. This feature, however, has been simulated for single magnetic nanoparticles or clusters with interparticle distances similar to the nanoparticle dimensions. For the possible use in bit-patterned media, it is important to understand the scaling behavior of the stability of the additional intermediate states with the interparticle distance. The paper investigates exemplarily nanoparticles of two shapes which were found to be optimum to gain four states at remanence. For clusters of these particles, the probability of reaching the additional intermediate states in all particles in the same field region is strongly reduced with decreased interparticle distance. The differences between both shapes indicate possible solutions for this problem in the form of new nanoparticle shapes.