title: Functional magnetic nanoparticle assemblies: formation, collective behavior, and future directions.
abstract: This Perspective describes recent progress in the development of functional magnetic nanoparticle assemblies. After describing the formation of two- and three-dimensional particle arrays in terms of the size-dependent driving forces, we focus on magnetic nanoparticle arrays. We discuss how the self-organized structure can modify the magnetic behavior, relative to that of isolated particles. We highlight an important development, described in this issue of ACS Nano by Kostiainen and co-workers, who have demonstrated not only the novel aqueous self-assembly of magnetic particles but also controlled and reversible disassembly. Finally, we explore two inter-related future directions for self-assembly of magnetic nanoparticles: the formation of more complex, hierarchical structures and the integration of self-assembly with fabrication techniques for electronic devices.
authors.affiliation: Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890, USA. sara@cmu.edu
authors.forename: S A
authors.initials: SA
authors.lastname: Majetich
authors.forename: T
authors.initials: T
authors.lastname: Wen
authors.forename: R A
authors.initials: RA
authors.lastname: Booth
mesh_terms: D001052:Apoferritins / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D060328:Magnetic Phenomena; D053758:Nanoparticles / Q000737:chemistry*; D055620:Optical Phenomena; D010087:Oxides / Q000737:chemistry*
chemical_list: D010087:Oxides; C088922:magnetoferritin; D001052:Apoferritins; D007501:Iron