Enhancement of coercivity of self-assembled stacking of ferrimagnetic and antiferromagnetic nanocubes

Sawano, Keisuke; Tsukiyama, Keishi; Shimizu, Makoto; Takasaki, Mihiro; Oaki, Yuya; Yamamoto, Takashi; Einaga, Yasuaki; Jenewein, Christian; Cölfen, Helmut; Kaiju, Hideo; Sato, Tetsuya; Imai, Hiroaki

doi:10.1039/c9nr10558a

Cited by 11 publications

(16 citation statements)

References 51 publications

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“…The inherent particle-mediated nonclassical crystallization pathway of these processes has raised increasing scientific attention in more recent research [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Consequently, researchers have discovered that the behavior of a controlled aggregation and self-assembly can further be utilized to create astounding new materials with exciting properties [ 6 , 15 , 16 , 17 , 18 , 19 ]. In particular, colloidal methods have been demonstrated to enable access to highly ordered structures with unique functionalities [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Mesocrystals from Platinum Nanocubes

Jenewein

Cölfen

2021

Nanomaterials

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Platinum nanoparticles are widely known for their numerous electrochemical and catalytic applications. Enhanced or novel properties that may arise when ordering such particles in a highly defined manner, however, are still subject to ongoing research, as superstructure formation on the mesoscale is still a major challenge to be overcome. In this work, we therefore established a reproducible method to fabricate micrometer-sized superstructures from platinum nanocubes. Through small-angle X-ray scattering and electron diffraction methods we demonstrate that the obtained superstructures have a high degree of ordering up to the atomic scale and, therefore, fulfill all criteria of a mesocrystal. By changing the solvent and stabilizer in which the platinum nanocubes were dispersed, we were able to control the resulting crystal habit of the mesocrystals. Aside from mesocrystal fabrication, this method can be further utilized to purify nanoparticle dispersions by recrystallization with respect to narrowing down the particle size distribution and removing contaminations.

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Section: Introductionmentioning

confidence: 99%

Mesocrystals from Platinum Nanocubes

Jenewein

Cölfen

2021

Nanomaterials

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“…47 Recently, it was shown that the coercivity of MNPs is enhanced by the exchange coupling at the interface of ferrimagnetic and antiferromagnetic selfassembled monolayers. 395 For this and similar systems, reectometry, GISANS, and XRMS can reveal the correlation between structural and magnetic ordering between the layers over a large size range with nanometer resolution. Micromagnetic simulations allow linking the microscopic structure to the corresponding macroscopic magnetic properties.…”

Section: Summary and Perspectivesmentioning

confidence: 93%

Using small-angle scattering to guide functional magnetic nanoparticle design

et al. 2022

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“…[36][37][38][39] Especially,a nisotropic nanoparticle assemblies have been of great interest due to their shape-dependent properties provided by an additional degree of freedom. [40][41][42][43] Research, however, has also laid out that the formation of BNSLs beyond layered membranes still remains am ajor issue until today.T othe best of our knowledge,nowork was reported on binary 3D mesocrystals despite their promising potential. Herein, we report the self-assembly of iron oxide (Fe 3 O 4 ) nanocubes (IONC) as well as platinum nanocubes (PtNC) into large mesocrystalline superstructures to demonstrate for the first time the formation of binary 3D mesocrystals containing both particle types.…”

Section: Introductionmentioning

confidence: 99%

3D Binary Mesocrystals from Anisotropic Nanoparticles

et al. 2021

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Binary mesocrystals offer the combination of nanocrystal properties in an ordered superstructure.H ere,w e demonstrate the simultaneous self-assembly of platinum and iron oxide nanocubes into micrometer-sized 3D mesocrystals using the gas-phase diffusion technique.B yt he addition of minor amounts of as econdary particle type tailored to nearly identical size, shape and surface chemistry,w ew ere able to promote ar andom incorporation of foreign particles into as elf-assembling host lattice.T he random distribution of the binary particle types on the surface and within its bulk has been visualizedusing advanced transmission and scanning electron microscopyt echniques.T he 20-40 mms ized binary mesocrystals have been further characterized through wide and small angle scattering techniques to reveal along-range orderingo n the atomic scale throughout the crystal while showing clear evidence that the material consists of individual building blocks.T hrough careful adjustments of the crystallization parameters,w ec ould further obtain ar everse superstructure, where incorporated particles and host lattice switch roles.

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Enhancement of coercivity of self-assembled stacking of ferrimagnetic and antiferromagnetic nanocubes

Abstract: The coercivity of magnetic nanoparticles is enhanced by the exchange coupling effect at the interface of ferrimagnetic and antiferromagnetic self-assembled monolayers.

Cited by 11 publications

References 51 publications

Mesocrystals from Platinum Nanocubes

Mesocrystals from Platinum Nanocubes

Using small-angle scattering to guide functional magnetic nanoparticle design

3D Binary Mesocrystals from Anisotropic Nanoparticles

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