Investigation of the dipole interaction in and between ordered arrangements of magnetic nanoparticles

Neugebauer, N.; Fabian, Alexander; Elm, Matthias T.; Hofmann, Detlev M.; Czerner, Michael; Heiliger, Christian; Klar, Peter J.

doi:10.1103/physrevb.101.104409

Cited by 10 publications

(4 citation statements)

References 46 publications

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“…This time range is especially interesting to study transversal, intra-well moment relaxation in MNPs. 397 Recent experiments revealed that the magnetic heating is significantly increased for some samples compared to classical magnetic hyperthermia with GHz-frequencies fields and low field amplitudes of around 0.2 mT. 398 The extremely high heating rates of 150 K s −1 were achieved when the excitation frequency matched the characteristic transversal relaxation frequency of the particle moments.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Using small-angle scattering to guide functional magnetic nanoparticle design

et al. 2022

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Section: Summary and Perspectivesmentioning

confidence: 99%

Using small-angle scattering to guide functional magnetic nanoparticle design

et al. 2022

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show abstract

“…This time range is especially interesting to study transversal, intra-well moment relaxation in MNPs. 397 Recent experiments revealed that the magnetic heating is significantly increased for some samples compared to classical magnetic hyperthermia with GHz-frequencies fields and low field amplitudes of around 0.2 mT. 398 The extremely high heating rates of 150 K/s were achieved when the excitation frequency matched the characteristic transversal relaxation frequency of the particle moments.…”

Section: Summary and Perspectivesmentioning

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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“…While natural self-assembly processes make use of weak forces such as van der Waals, electrostatic, or hydrodynamic, directed self-assembly can be beneficial for a more controlled, rapid, and large-scale synthesis of substrates [29]. In fact, such directed self-assembly of colloidal particles has fundamental importance and can have potential applications in spectroscopic measurements and transport mechanisms [30][31][32][33][34][35][36][37][38][39][40]. For instance, inkjet printing techniques based on electrohydrodynamics for the assembly of colloidal and plasmonic nanoparticles have been efficiently utilized for SERS applications [41].…”

Section: Introductionmentioning

confidence: 99%

Magnetically-assembled multifunctional magnetic-plasmonic SERS substrate for low-concentration analyte detection

Amonkar

Cherukulappurath

2023

Nanotechnology

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Multifunctional particles with combined magnetic and optical properties are promising materials for applications such as sensing and detection of analytes, and contrast agents for imaging techniques such as MRI, and photocatalysis. While the magnetic property allows for non-contact manipulation of the nanoparticles, optical properties can be harnessed for such sensing applications. We present the synthesis and large-scale assembly of inter-layered magnetic-plasmonic nanoparticles with graphene oxide (GO) spacer (Fe3O4@GO@Ag). The multifunctional composite particles were prepared using simple chemical methods and had an average size of 220 nm. The prepared samples were characterized using different techniques including powder XRD, FT-IR, Raman scattering, SEM and TEM imaging. By using an external magnetic field, it is possible to form an assembly of these multifunctional particles on a large scale. Due to the chain-like formation in the presence of a magnetic field, such assemblies are good substrates for surface-enhanced Raman scattering (SERS). Here, we demonstrate the application of these magnetically assembled-particles for the detection of very low concentrations of analyte molecules (4-mercaptopyridine) using SERS. These multifunctional composite particles are good candidates for potential applications involving chemical detection, photocatalytic reactions, optoelectronic devices, and photothermal effects.

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Investigation of the dipole interaction in and between ordered arrangements of magnetic nanoparticles

Cited by 10 publications

References 46 publications

Using small-angle scattering to guide functional magnetic nanoparticle design

Using small-angle scattering to guide functional magnetic nanoparticle design

Using small-angle scattering to guide functional magnetic nanoparticle design

Magnetically-assembled multifunctional magnetic-plasmonic SERS substrate for low-concentration analyte detection

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