Collective Dipolar Interactions in Self-Assembled Magnetic Binary Nanocrystal Superlattice Membranes

Chen, Jun; Dong, Angang; Cai, Jing; Ye, Xingchen; Kang, Yijin; Kikkawa, James M.; Murray, Christopher B.

doi:10.1021/nl103568q

Cited by 152 publications

(141 citation statements)

References 39 publications

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“…It was subsequently explored both theoretically and experimentally for nanoparticle assemblies, including particle chains10, ordered 2D arrays1112131415, and 3D lattices16. Dipolar glasses in random 3D arrangements13171819 and dipolar antiferromagnetism in 2D arrays were also investigated20.…”

mentioning

confidence: 99%

Dipolar Magnetism in Ordered and Disordered Low-Dimensional Nanoparticle Assemblies

Varón

Beleggia

Kasama

et al. 2013

Sci Rep

131

106

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Magnetostatic (dipolar) interactions between nanoparticles promise to open new ways to design nanocrystalline magnetic materials and devices if the collective magnetic properties can be controlled at the nanoparticle level. Magnetic dipolar interactions are sufficiently strong to sustain magnetic order at ambient temperature in assemblies of closely-spaced nanoparticles with magnetic moments of ≥ 100 μB. Here we use electron holography with sub-particle resolution to reveal the correlation between particle arrangement and magnetic order in self-assembled 1D and quasi-2D arrangements of 15 nm cobalt nanoparticles. In the initial states, we observe dipolar ferromagnetism, antiferromagnetism and local flux closure, depending on the particle arrangement. Surprisingly, after magnetic saturation, measurements and numerical simulations show that overall ferromagnetic order exists in the present nanoparticle assemblies even when their arrangement is completely disordered. Such direct quantification of the correlation between topological and magnetic order is essential for the technological exploitation of magnetic quasi-2D nanoparticle assemblies.

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mentioning

confidence: 99%

Dipolar Magnetism in Ordered and Disordered Low-Dimensional Nanoparticle Assemblies

Varón

Beleggia

Kasama

et al. 2013

Sci Rep

131

106

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show abstract

“…Interest in the self-assembly of magnetic nanoparticles (MNPs) into larger ordered structures as an approach for engineering new materials and devices1 such as photonic crystals2, magnetotransporters3, micromechanical sensors4, magnetic memory materials5, magnetic switching devices6, magnetic force probes7, and DNA separation materials8 among others910 has recently increased. Therefore, developing generally applicable and effective techniques for the assembly of ordered nanostructures of MNPs is essential.…”

mentioning

confidence: 99%

A microfibre assembly of an iron-carbon composite with giant magnetisation

Liang

Liu

Xiao

et al. 2013

Sci Rep

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Iron carbide is among the oldest known materials. The utility of this ancient advanced material is greatly extended in its nanostructured forms. We demonstrate for the first time that one-dimensional iron carbide microfibres can be assembled in liquid using strong magnetic field-assisted laser ablation. The giant saturation magnetisation of these particles was measured a 261 emu/g at room temperature, which is the best value reported to date for iron nitride and carbide nanostructures, is 5.5 times greater than the 47 emu/g reported for Fe3C nanoparticles, and exceeds the 212 emu/g for bulk Fe. The magnetic field-induced dipolar interactions of the magnetic nanospheres and the nanochains played a key role in determining the shape of the product. These findings lead to a variety of promising applications for this unique nanostructure including its use as a magnetically guided transporter for biomedicine and as a magnetic recording material.

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“…[16][17][18][19][20] Much less experimental work has been reported on the design of suitable conditions for formation of ordered arrays and full characterization of the (three-dimensional) structures formed from nonspherical objects.…”

Section: -13mentioning

confidence: 99%

“…[9][10][11][12][13] The early work on self-assembly of nanoparticles focused on spheres, with hexagonally packed arrays being produced from monodisperse spheres 14,15 and more recently nanoparticle arrays with complex structures by mixing monodisperse spheres of different sizes. [16][17][18][19][20] Much less experimental work has been reported on the design of suitable conditions for formation of ordered arrays and full characterization of the (three-dimensional) structures formed from nonspherical objects.…”

mentioning

confidence: 99%

Shape Induced Symmetry in Self-Assembled Mesocrystals of Iron Oxide Nanocubes

Disch¹,

Wetterskog²,

Hermann³

et al. 2011

Nano Lett.

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Japan Synchrotron Radiation Research Institute (JASRI), Spring-8, Sayo Hyogo 679-5198, Japan b S Supporting Information S elf-assembly of molecules and nanoparticles into tailored structures is a promising strategy for production and design of materials with new functions. [1][2][3][4] The spontaneous organization of the nanoscale building blocks into periodically packed structures is controlled by thermodynamic constraints and specific boundary conditions resulting in systems that commonly span a rich energy landscape.2,5 Modulation of the particle interactions has a pivotal influence on the formed structures and the quality of nanocrystal mesocrystals. [6][7][8] Tuning the magnitude and directionality of the interparticle forces between, e.g., dipolar nanoparticles by applying electrical or magnetic fields may also have a profound effect on the assembly process and the resulting structures of the nanoparticle mesocrystals. 9-13The early work on self-assembly of nanoparticles focused on spheres, with hexagonally packed arrays being produced from monodisperse spheres 14,15 and more recently nanoparticle arrays with complex structures by mixing monodisperse spheres of different sizes. [16][17][18][19][20] Much less experimental work has been reported on the design of suitable conditions for formation of ordered arrays and full characterization of the (three-dimensional) structures formed from nonspherical objects. 21-23Here, we show how superparamagnetic iron oxide nanocubes with a well-defined shape and size can be assembled into wellordered arrays and how the three-dimensional structure can be determined by a combination of grazing incidence small-angle scattering (GISAXS) and electron microscopy. We demonstrate how a small deviation from a perfect cubic geometry of the nanoparticle building blocks can dictate the symmetry of the array and show for the first time that nonspherical nanoparticles can assemble into a highly ordered body-centered tetragonal structure. Energy models that account for the directionality and magnitude of the van der Waals and dipolar interactions as a function of the degree of truncation of the nanocubes were used to evaluate the importance of the directional dipolar forces in the self-assembly process and to predict the occurrence of simple cubic and body-centered tetragonal mesocrystal structures.Iron oxide nanocrystals have attracted much interest for a range of applications because of the combination of tunable magnetic properties and controllable surface properties. 24-28The oleic acid capped nanocrystals were prepared by a modified nonhydrolytic synthesis approach, 9,25 purified into a nanoparticle paste, and dispersed in toluene to a concentration of about 10 14 particles/mL (see Supporting Information for details). Germanium wafers were cleaned by sonication in toluene, followed by ethyl acetate and ethanol (30 min each). Fast evaporation of the carrier solvent was achieved by spin-coating an excess amount of toluene dispersion, at 1000 rpm for 20 s. Evaporation was slowed down...

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Collective Dipolar Interactions in Self-Assembled Magnetic Binary Nanocrystal Superlattice Membranes

Cited by 152 publications

References 39 publications

Dipolar Magnetism in Ordered and Disordered Low-Dimensional Nanoparticle Assemblies

Dipolar Magnetism in Ordered and Disordered Low-Dimensional Nanoparticle Assemblies

A microfibre assembly of an iron-carbon composite with giant magnetisation

Shape Induced Symmetry in Self-Assembled Mesocrystals of Iron Oxide Nanocubes

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