Size-Dependent Relaxation Properties of Monodisperse Magnetite Nanoparticles Measured Over Seven Decades of Frequency by AC Susceptometry

Ferguson, R. Matthew; Khandhar, Amit P.; Jonasson, Christian; Blomgren, Jakob; Johansson, Christer; Krishnan, Kannan M.

doi:10.1109/tmag.2013.2239621

Cited by 49 publications

(33 citation statements)

References 14 publications

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“…ACS measurements for frequencies up to 10 MHz on suspensions of single-core magnetite particles which are similar to the ones studied here were recently presented[12]. In contrast to the model discussed below, the authors only consider a distribution of core diameters assuming a constant organic shell thickness.…”

Section: Characterizationsmentioning

confidence: 97%

Self-consistent magnetic properties of magnetite tracers optimized for magnetic particle imaging measured by ac susceptometry, magnetorelaxometry and magnetic particle spectroscopy

Ludwig

Remmer

Kuhlmann

et al. 2014

Journal of Magnetism and Magnetic Materials

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Sensitivity and spatial resolution in Magnetic Particle Imaging are affected by magnetic properties of the nanoparticle tracers used during imaging. Here, we have carried out a comprehensive magnetic characterization of single-core iron oxide nanoparticles that were designed for MPI. We used ac susceptometry, fluxgate magnetorelaxometry, and magnetic particle spectroscopy to evaluate the tracer’s magnetic core size, hydrodynamic size, and magnetic anisotropy. Our results present a self-consistent set of magnetic and structural parameters for the tracers that is consistent with direct measurements of size using transmission electron microscopy and dynamic light scattering and that can be used to better understand their MPI performance.

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Section: Characterizationsmentioning

confidence: 97%

Self-consistent magnetic properties of magnetite tracers optimized for magnetic particle imaging measured by ac susceptometry, magnetorelaxometry and magnetic particle spectroscopy

Ludwig

Remmer

Kuhlmann

et al. 2014

Journal of Magnetism and Magnetic Materials

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“…Most research on nanoparticles has largely focused on how size, shape, structure and chemical composition affect magnetic properties 4,5 . The past decade has seen major advances in terms of sub-nanometer probes of materials and fabrication techniques, which have allowed exploration of magnetic effects due to a non-uniform spin configuration within a nanoparticle 6–9 .…”

Section: Introductionmentioning

confidence: 99%

Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles

Oberdick

Abdelgawad

Moya

et al. 2018

Sci Rep

105

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Magnetic nanoparticles (MNPs) have become increasingly important in biomedical applications like magnetic imaging and hyperthermia based cancer treatment. Understanding their magnetic spin configurations is important for optimizing these applications. The measured magnetization of MNPs can be significantly lower than bulk counterparts, often due to canted spins. This has previously been presumed to be a surface effect, where reduced exchange allows spins closest to the nanoparticle surface to deviate locally from collinear structures. We demonstrate that intraparticle effects can induce spin canting throughout a MNP via the Dzyaloshinskii-Moriya interaction (DMI). We study ~7.4 nm diameter, core/shell Fe3O4/MnxFe3−xO4 MNPs with a 0.5 nm Mn-ferrite shell. Mössbauer spectroscopy, x-ray absorption spectroscopy and x-ray magnetic circular dichroism are used to determine chemical structure of core and shell. Polarized small angle neutron scattering shows parallel and perpendicular magnetic correlations, suggesting multiparticle coherent spin canting in an applied field. Atomistic simulations reveal the underlying mechanism of the observed spin canting. These show that strong DMI can lead to magnetic frustration within the shell and cause canting of the net particle moment. These results illuminate how core/shell nanoparticle systems can be engineered for spin canting across the whole of the particle, rather than solely at the surface.

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“…The heating capacity of MNPs is quantified by the SAR (specific absorption rate) value according to the following relation [12, 16, 17]: …”

Section: Methodsmentioning

confidence: 99%

“…The ESAR is a heating transformation ability which normalizes SAR with respect to field strength and frequency. It is expressed as follows: [8, 16, 18, 19]: …”

Section: Methodsmentioning

confidence: 99%

LSMO Nanoparticles Coated by Hyaluronic Acid for Magnetic Hyperthermia

et al. 2016

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Magnetic hyperthermia with the treating temperature range of 41–46 °C is an alternative therapy for cancer treatment. In this article, lanthanum strontium manganates (La1−xSrxMnO3, 0.25 ≤ × ≤ 0.35) magnetic nanoparticles coated by hyaluronic acid (HA) which possesses the ability of targeting tumor cells were prepared by a simple hydrothermal method combined with a high-energy ball milling technique. The crystal structure, morphology, magnetic properties of the HA-coated magnetic nanoparticles (MNPs), and their heating ability under alternating magnetic field were investigated. It was found the HA-coated La0.7Sr0.3MnO3, with particle diameter of ~100 nm, Curie temperature of 45 °C at a concentration 6 mg/ml, gave the optimal induction heating results. The heating temperature saturates at 45.7 °C, and the ESAR is 5.7 × 10−3 W/g · kHz · (kA/m2) which is much higher than other reported results.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1756-3) contains supplementary material, which is available to authorized users.

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Size-Dependent Relaxation Properties of Monodisperse Magnetite Nanoparticles Measured Over Seven Decades of Frequency by AC Susceptometry

Cited by 49 publications

References 14 publications

Self-consistent magnetic properties of magnetite tracers optimized for magnetic particle imaging measured by ac susceptometry, magnetorelaxometry and magnetic particle spectroscopy

Self-consistent magnetic properties of magnetite tracers optimized for magnetic particle imaging measured by ac susceptometry, magnetorelaxometry and magnetic particle spectroscopy

Spin canting across core/shell Fe3O4/MnxFe3−xO4 nanoparticles

LSMO Nanoparticles Coated by Hyaluronic Acid for Magnetic Hyperthermia

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