Special Issue "Interactions Effects in Nanoscaled Magnetic Assemblies"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: 31 March 2021.

Special Issue Editor

Prof. Dr. Oscar Iglesias
Website1 Website2
Guest Editor
Department of Condensed Matter Physics and IN2UB, University of Barcelona, Barcelona 08028, Spain
Interests: micromagnetism; exchange bias; magnetic hyperthermia; theorical modelling of nanomaterials; Monte Carlo simulations; biomedical applications; hysteresis

Special Issue Information

Dear Colleagues,

In the recent decades, the use of magnetic elements with nanoscale dimensions has spread from the typical fields of magnetic storage, spintronics and technological applications towards biomedical applications such as drug delivery, magnetic resonance imaging and magnetic hyperthermia, just to mention some examples.

Typically, an ensemble of such elements is used in applications, and, therefore, interactions between the magnetic elements are ubiquous and may give rise to magnetic collective properties that are not present at the individual element level. Examples include dipolar interactions between nanoparticles in assemblies and exchange coupling between them. Additionally of importance is the case of magnetic elements (disks, tubes, wires and so on) supporting non-uniform excitations such as domain walls, spin waves, plasmons, vortices or skyrmions, where the proximity between the elements gives rise to interactions between these excitations.

This Special Issue of Nanomaterials is aimed at featuring recent advances in studies addressing the effects that the interactions mentioned above and coupling between magnetic elements of all types have on their static and dynamic magnetic properties. The selection of articles finally published in this issue should should allow us to illustrate how we can control interactions so as to avoid their undesired effects in some cases and, at the same time, to show how their fine tuning can be exploited positively to discover new phenomena. Researchers working in the field of nanomagnetism spintronics and biomedical applications at the experimental or theoretical level are welcome to contribute with their recent findings in the field, submitting a review or original article.

Prof. Dr. Oscar Iglesias
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Magnetic nanoparticles
  • Dipolar interactions
  • Magnetic hysteresis
  • Magnetic nanowires and nanotubes
  • Biomedical applications
  • Simulation methods
  • Nanomagnetism
  • Theoretical models
  • Interfacial effects
  • Exchange bias
  • DMI interactions
  • Magnetic vortices and skyrmions
  • Magnetic relaxation
  • Magnetic recording
  • Dipolar fluids

Published Papers (2 papers)

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Research

Open AccessCommunication
Uncovering the Magnetic Particle Imaging and Magnetic Resonance Imaging Features of Iron Oxide Nanocube Clusters
Nanomaterials 2021, 11(1), 62; https://doi.org/10.3390/nano11010062 - 29 Dec 2020
Abstract
Multifunctional imaging nanoprobes continue to garner strong interest for their great potential in the detection and monitoring of cancer. In this study, we investigate a series of spatially arranged iron oxide nanocube-based clusters (i.e., chain-like dimer/trimer, centrosymmetric clusters, and enzymatically cleavable two-dimensional clusters) [...] Read more.
Multifunctional imaging nanoprobes continue to garner strong interest for their great potential in the detection and monitoring of cancer. In this study, we investigate a series of spatially arranged iron oxide nanocube-based clusters (i.e., chain-like dimer/trimer, centrosymmetric clusters, and enzymatically cleavable two-dimensional clusters) as magnetic particle imaging and magnetic resonance imaging probes. Our findings demonstrate that the short nanocube chain assemblies exhibit remarkable magnetic particle imaging signal enhancement with respect to the individually dispersed or the centrosymmetric cluster analogues. This result can be attributed to the beneficial uniaxial magnetic dipolar coupling occurring in the chain-like nanocube assembly. Moreover, we could effectively synthesize enzymatically cleavable two-dimensional nanocube clusters, which upon exposure to a lytic enzyme, exhibit a progressive increase in magnetic particle imaging signal at well-defined incubation time points. The increase in magnetic particle imaging signal can be used to trace the disassembly of the large planar clusters into smaller nanocube chains by enzymatic polymer degradation. These studies demonstrate that chain-like assemblies of iron oxide nanocubes offer the best spatial arrangement to improve magnetic particle imaging signals. In addition, the nanocube clusters synthesized in this study also show remarkable transverse magnetic resonance imaging relaxation signals. These nanoprobes, previously showcased for their outstanding heat performance in magnetic hyperthermia applications, have great potential as dual imaging probes and could be employed to improve the tumor thermo-therapeutic efficacy, while offering a readable magnetic signal for image mapping of material disassemblies at tumor sites. Full article
(This article belongs to the Special Issue Interactions Effects in Nanoscaled Magnetic Assemblies)
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Open AccessArticle
Exploring the Different Degrees of Magnetic Disorder in TbxR1−xCu2 Nanoparticle Alloys
Nanomaterials 2020, 10(11), 2148; https://doi.org/10.3390/nano10112148 - 28 Oct 2020
Abstract
Recently, potential technological interest has been revealed for the production of magnetocaloric alloys using Rare-Earth intermetallics. In this work, three series of TbxR1xCu2 (R ≡ Gd, La, Y) alloys have been produced in bulk and nanoparticle [...] Read more.
Recently, potential technological interest has been revealed for the production of magnetocaloric alloys using Rare-Earth intermetallics. In this work, three series of TbxR1xCu2 (R ≡ Gd, La, Y) alloys have been produced in bulk and nanoparticle sizes via arc melting and high energy ball milling. Rietveld refinements of the X-ray and Neutron diffraction patterns indicate that the crystalline structure in all alloys is consistent with TbCu2 orthorhombic Imma bulk crystalline structure. The analyses of the DC-magnetisation (MDC) and AC-susceptibility (χAC) show that three distinct degrees of disorder have been achieved by the combination of both the Tb3+ replacement (dilution) and the nanoscaling. These disordered states are characterised by transitions which are evident to MDC, χAC and specific heat. There exists an evolution from the most ordered Superantiferromagnetic arrangement of the Tb0.5La0.5Cu2 NPs with Néel temperature, TN 27 K, and freezing temperature, Tf 7 K, to the less ordered weakly interacting Superparamagnetism of the Tb0.1Y0.9Cu2 nanoparticles (TN absent, and TB 3 K). The Super Spin Glass Tb0.5Gd0.5Cu2 nanoparticles (TN absent, and Tf 20 K) are considered an intermediate disposition in between those two extremes, according to their enhanced random-bond contribution to frustration. Full article
(This article belongs to the Special Issue Interactions Effects in Nanoscaled Magnetic Assemblies)
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