Single-Crystalline Body Centered FeCo Nano-Octopods: From One-Pot Chemical Growth to a Complex 3D Magnetic Configuration

Garnero, Cyril; Pierrot, Alexandre; Gatel, Christophe; Marcelot, Cécile; Arenal, Raúl; Florea, Ileana; Bernand-Mantel, Anne; Soulantica, Katerina; Poveda, Patrick; Chaudret, Bruno; Blon, Thomas; Lacroix, Lise‐Marie

doi:10.1021/acs.nanolett.1c01087

Cited by 8 publications

(13 citation statements)

References 37 publications

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“…Even though a variety of magnetic nanostructures have been prepared and studied, there are still many problems worthy of further study. (1) Development of new ferromagnetic nanostructures, such as nano-octagonal stars [133]. In the past, the morphology characterization mainly focused on 2D characterization.…”

Section: Discussionmentioning

confidence: 99%

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Morphology-Dependent Room-Temperature Ferromagnetism in Undoped ZnO Nanostructures

Ren

Xiang

2021

Nanomaterials

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Since Dietl et al. predicted that Co-doped ZnO may show room-temperature ferromagnetism (RTFM) in 2000, researchers have focused on the investigation of ferromagnetic ZnO doped with various transition metals. However, after decades of exploration, it has been found that undoped ZnO nanostructures can also show RTFM, which in general is dependent on ZnO morphologies. Here, we will give an overall review on undoped ZnO nanomaterials with RTFM. The advanced strategies to achieve multidimensional (quasi-0D, 1D, 2D, and 3D) ferromagnetic ZnO nanostructures and the mechanisms behind RTFM are systematically presented. We have successfully prepared ferromagnetic nanostructures, including thin films, horizontal arrays and vertical arrays. The existing challenges, including open questions about quantum-bound ZnO nanostructures, are then discussed.

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Section: Discussionmentioning

confidence: 99%

“…Recently, 3D electron tomography has emerged to analyze the 3D structure of nanostructures. In addition, the self-assembly of nanostructures and the evolution of ferromagnetism were further studied by an in situ method [133,134]. (2) Development of some emerging methods to prepare and study the nanostructure.…”

Section: Discussionmentioning

confidence: 99%

Morphology-Dependent Room-Temperature Ferromagnetism in Undoped ZnO Nanostructures

Ren

Xiang

2021

Nanomaterials

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“…392,393 This concept can be easily transferred to other scattering techniques such as SANS to classify the most appropriate model. 394 Regarding future experiments, we think that combining smallangle scattering experiments with micromagnetic simulations could be particularly useful to investigate exotic nanoparticles such as hollow particles 42 including nanorings, 43 nanotubes, 44 and other shape-anisotropic hollow particles, 45 or nanodots 46 and nano-octopods 47 . Recently, it was shown that the coercivity of MNPs is enhanced by the exchange coupling at the interface of ferrimagnetic and antiferromagnetic self-assembled monolayers.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

“…41 More exotic magnetization states can be found, e.g. in hollow particles 42 including nanorings, 43 nanotubes, 44 and other shape-anisotropic hollow particles, 45 or nanodots 46 and nano-octopods 47 . In many cases, the MNPs consist of the typical 3d ferromagnetic elements Fe, Co, Ni, alloys (FePt, FePd) or their oxides, with iron oxides being the most prominent example.…”

Section: Introductionmentioning

confidence: 99%

Using small-angle scattering to guide functional magnetic nanoparticle design

Honecker,

Bersweiler,

Erokhin

et al. 2022

Preprint

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Magnetic nanoparticles offer unique potential for various technological, biomedical, or environmental applications thanks to the size-, shape-and material-dependent tunability of their magnetic properties. To optimize particles for a specific application, it is crucial to interrelate their performance with their structural and magnetic properties. This review presents the advantages of small-angle X-ray and neutron scattering techniques for achieving a detailed multiscale characterization of magnetic nanoparticles and their ensembles in a mesoscopic size range from 1 to a few hundred nanometers with nanometer resolution. Both X-rays and neutrons allow the ensemble-averaged determination of structural properties, such as particle morphology or particle arrangement in multilayers and 3D assemblies. Additionally, the magnetic scattering contributions enable retrieving the internal magnetization profile of the nanoparticles as well as the inter-particle moment correlations caused by interactions within dense assemblies. Most measurements are used to determine the time-averaged ensemble properties, in addition advanced small-angle scattering techniques exist that allow accessing particle and spin dynamics on various timescales. In this review, we focus on conventional small-angle X-ray and neutron scattering (SAXS and SANS), X-ray and neutron reflectometry, gracing-incidence SAXS and SANS, X-ray resonant magnetic scattering, and neutron spin-echo spectroscopy techniques. For each technique, we provide a general overview, present the latest scientific results, and discuss its strengths as well as sample requirements. Finally, we give our perspectives on how future small-angle scattering experiments, especially in combination with micromagnetic simulations, could help to optimize the performance of magnetic nanoparticles for specific applications.

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“…in hollow particles, 42 nanorings, 43 nanotubes, 44 and other shape-anisotropic hollow particles, 45 or nanodots 46 and nano-octopods. 47 In many cases, the MNPs consist of the typical 3d ferromagnetic elements Fe, Co, Ni, alloys (FePt, FePd) or their oxides, with iron oxides being the most prominent example. Recently, MNPs of 4f-intermetallic alloys ( e.g.…”

Section: Introductionmentioning

confidence: 99%