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Nanomaterials
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Hybrid Magnetic Nanomaterials
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Hybrid Magnetic Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 12171

Special Issue Editors

Prof. Dr. Jordi Sort

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Guest Editor
Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
Interests: metallic alloys; composite materials; nanomaterials; biomaterials; thin films; nanoporous materials; surface treatments; mechanical performance; magnetism
Special Issues, Collections and Topics in MDPI journals
Dr. Gemma Rius

E-Mail Website
Guest Editor
Institut de Microelectrònica de Barcelona, IMB-CNM-CSIC, Campus UAB, E-08193 Bellaterra, Spain
Interests: graphene; silicon; nanostructured carbon; superconductors, transistors; NEMS; electron/ion beam patterning; atomic force microscopy; particle irradiation; nanofabrication; micro/nanoelectronics; quantum computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are launching a Special Issue in Nanomaterials (IF: 5.076) entitled “Hybrid Magnetic Nanomaterials”. The aim of this Special Issue is to publish original research articles as well as topical reviews focused on the preparation, characterization, and study of the functional properties of hybrid magnetic nanomaterials, as well as their integration into operational devices.

Hybrid magnetic materials are appealing for diverse technological applications, encompassing 2D and 3D lithographed magnetic data storage systems, miniaturized magnetic nanoelectromechanical systems (including magnetically wirelessly guided micro/nano-robots), biomedical lab-on-a-chip platforms (for magnetically triggered drug delivery), or magnetorheological fluids (microfluidics), amongst others.

The target investigated materials should contain nanometric materials in at least one of their dimensions. The final properties should take advantage of synergistic or complementary physical and/or chemical properties resulting from the combination of various constituent materials in the studied hybrid magnetic structures.

Examples of materials that will be covered in this Special Issue include mesostructured metallic/oxide films filled with polymeric second phases, magnetic nano- or microparticles embedded in a nonmagnetic matrix (including self-assemblies), lithographed nanocomposite structures (vertically aligned nanostructures, hierarchically assembled frameworks), etc. Special emphasis will be placed on contributions with an interdisciplinary character, merging diverse expertise from physics, chemistry, biomedicine, and materials science engineering fields, while aiming at an optimized material performance at the nanoscale.

Prof. Dr. Jordi Sort
Dr. Gemma Rius
Guest Editors

text
SEM image of a mesoporous magnetic alloy filled with a second phase

 

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 submissions that pass pre-check are 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 semimonthly 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 2900 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

  • hybrid metallic/polymeric magnetic nanomaterials
  • metallic/oxide nanocomposites
  • lithography for 2D and 3D magnetic nanostructures
  • processing for micro/nanostructured magnetic thin films
  • new physical/chemical synthetic approaches
  • magnetic properties, spintronics
  • magnetic nanomaterials for biomedical applications
  • magnetic nanoelectromechanical systems (magnetic NEMS)
  • magnetically actuated nanorobots
  • characterization tools and methods for magnetism at the micro/nanoscale

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Published Papers (6 papers)

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Research

12 pages, 3501 KiB  
Article
Remanence Increase in SrFe12O19/Fe Exchange-Decoupled Hard-Soft Composite Magnets Owing to Dipolar Interactions
by Jesús Carlos Guzmán-Mínguez, Cecilia Granados-Miralles, Patrick Kuntschke, César de Julián Fernández, Sergey Erokhin, Dmitry Berkov, Thomas Schliesch, Jose Francisco Fernández and Adrián Quesada
Nanomaterials 2023, 13(14), 2097; https://doi.org/10.3390/nano13142097 - 18 Jul 2023
Cited by 1 | Viewed by 1446
Abstract
In the search for improved permanent magnets, fueled by the geostrategic and environmental issues associated with rare-earth-based magnets, magnetically hard (high anisotropy)-soft (high magnetization) composite magnets hold promise as alternative magnets that could replace modern permanent magnets, such as rare-earth-based and ceramic magnets, [...] Read more.
In the search for improved permanent magnets, fueled by the geostrategic and environmental issues associated with rare-earth-based magnets, magnetically hard (high anisotropy)-soft (high magnetization) composite magnets hold promise as alternative magnets that could replace modern permanent magnets, such as rare-earth-based and ceramic magnets, in certain applications. However, so far, the magnetic properties reported for hard-soft composites have been underwhelming. Here, an attempt to further understand the correlation between magnetic and microstructural properties in strontium ferrite-based composites, hard SrFe12O19 (SFO) ceramics with different contents of Fe particles as soft phase, both in powder and in dense injection molded magnets, is presented. In addition, the influence of soft phase particle dimension, in the nano- and micron-sized regimes, on these properties is studied. While Fe and SFO are not exchange-coupled in our magnets, a remanence that is higher than expected is measured. In fact, in composite injection molded anisotropic (magnetically oriented) magnets, remanence is improved by 2.4% with respect to a pure ferrite identical magnet. The analysis of the experimental results in combination with micromagnetic simulations allows us to establish that the type of interaction between hard and soft phases is of a dipolar nature, and is responsible for the alignment of a fraction of the soft spins with the magnetization of the hard. The mechanism unraveled in this work has implications for the development of novel hard-soft permanent magnets. Full article
(This article belongs to the Special Issue Hybrid Magnetic Nanomaterials)
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12 pages, 1846 KiB  
Article
Exploring Spin-Phonon Coupling in Magnetic 2D Metal-Organic Frameworks
by Diego López-Alcalá, Alberto M. Ruiz and José J. Baldoví
Nanomaterials 2023, 13(7), 1172; https://doi.org/10.3390/nano13071172 - 25 Mar 2023
Cited by 1 | Viewed by 2534
Abstract
Layered magnetic metal-organic frameworks (MOFs) are an emerging class of materials that can combine the advantages of both MOFs and 2D magnetic crystals. The recent discovery of large coercivity and long-range magnetic ordering up to 515 K in a layered MOF of general [...] Read more.
Layered magnetic metal-organic frameworks (MOFs) are an emerging class of materials that can combine the advantages of both MOFs and 2D magnetic crystals. The recent discovery of large coercivity and long-range magnetic ordering up to 515 K in a layered MOF of general formula MCl2(pyz)2 (M = transition metal, pyz = pyrazine) offers an exciting versatile platform to achieve high-TC magnetism at the 2D limit. In this work, we investigate the exfoliation feasibility down to the monolayer of VCl2(pyz)2 and CrCl2(pyz)2 by means of first-principles calculations. We explore their structural, electronic, magnetic and vibrational properties, as well as the effect of halide substitution. Then, we provide a full analysis of the spin-phonon coupling (SPC) in both 2D derivatives. Our calculations reveal a low SPC and thermal evolution of the magnetic exchange interactions and single-ion anisotropy mainly governed by low-frequency phonon modes. Finally, we provide chemical insights to improve the performance of these magnetic 2D MOFs based on the effective manipulation of the phonon modes that can present a major impact on their magnetic properties. Full article
(This article belongs to the Special Issue Hybrid Magnetic Nanomaterials)
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10 pages, 1250 KiB  
Article
Magnetoresistive Properties of Nanocomposites Based on Ferrite Nanoparticles and Polythiophene
by Roma Wirecka, Krzysztof Maćkosz, Antoni Żywczak, Mateusz Marek Marzec, Szczepan Zapotoczny and Andrzej Bernasik
Nanomaterials 2023, 13(5), 879; https://doi.org/10.3390/nano13050879 - 26 Feb 2023
Cited by 6 | Viewed by 1920
Abstract
In the presented study, we have synthesized six nanocomposites based on various magnetic nanoparticles and a conducting polymer, poly(3-hexylthiophene-2,5-diyl) (P3HT). Nanoparticles were either coated with squalene and dodecanoic acid or with P3HT. The cores of the nanoparticles were made of one of three [...] Read more.
In the presented study, we have synthesized six nanocomposites based on various magnetic nanoparticles and a conducting polymer, poly(3-hexylthiophene-2,5-diyl) (P3HT). Nanoparticles were either coated with squalene and dodecanoic acid or with P3HT. The cores of the nanoparticles were made of one of three different ferrites: nickel ferrite, cobalt ferrite, or magnetite. All synthesized nanoparticles had average diameters below 10 nm, with magnetic saturation at 300 K varying between 20 to 80 emu/g, depending on the used material. Different magnetic fillers allowed for exploring their impact on the conducting properties of the materials, and most importantly, allowed for studying the influence of the shell on the final electromagnetic properties of the nanocomposite. The conduction mechanism was well defined with the help of the variable range hopping model, and a possible mechanism of electrical conduction was proposed. Finally, the observed negative magnetoresistance of up to 5.5% at 180 K, and up to 1.6% at room temperature, was measured and discussed. Thoroughly described results show the role of the interface in the complex materials, as well as clarify room for improvement of the well-known magnetoelectric materials. Full article
(This article belongs to the Special Issue Hybrid Magnetic Nanomaterials)
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15 pages, 4227 KiB  
Article
Electroless Cobalt Deposition on Dealloyed Nanoporous Gold Substrate: A Versatile Technique to Control Morphological and Magnetic Properties
by Gabriele Barrera, Federico Scaglione, Federica Celegato, Marco Coïsson, Paola Tiberto and Paola Rizzi
Nanomaterials 2023, 13(3), 494; https://doi.org/10.3390/nano13030494 - 26 Jan 2023
Cited by 2 | Viewed by 1796
Abstract
The connection of multidisciplinary and versatile techniques capable of depositing and modeling thin films in multistep complex fabrication processes offers different perspectives and additional degrees of freedom in the realization of patterned magnetic materials whose peculiar physical properties meet the specific needs of [...] Read more.
The connection of multidisciplinary and versatile techniques capable of depositing and modeling thin films in multistep complex fabrication processes offers different perspectives and additional degrees of freedom in the realization of patterned magnetic materials whose peculiar physical properties meet the specific needs of several applications. In this work, a fast and cost-effective dealloying process is combined with a fast, low-cost, scalable electroless deposition technique to realize hybrid magnetic heterostructures. The gold nanoporous surface obtained by the dealloying of an Au40Si20Cu28Ag7Pd5 ribbon is used as a nanostructured substrate for the electrodeposition of cobalt. In the first steps of the deposition, the Co atoms fill the gold pores and arrange themselves into a patterned thin film with harder magnetic properties; then they continue their growth into an upper layer with softer magnetic properties. The structural characterization of the hybrid magnetic heterostructures is performed using an X-ray diffraction technique and energy-dispersive X-ray spectroscopy, while the morphology of the samples as a function of the electrodeposition time is characterized by images taken in top and cross-section view using scanning electron microscopy. Then, the structural and morphologic features are correlated with the room-temperature magnetic properties deduced from an alternating-gradient magnetometer’s measurements of the hysteresis loop and first order reversal curves. Full article
(This article belongs to the Special Issue Hybrid Magnetic Nanomaterials)
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13 pages, 3360 KiB  
Article
Combination of Micelle Collapse and CuNi Surface Dissolution for Electrodeposition of Magnetic Freestanding Chitosan Film
by Jingyuan Bai, Meilin Zhang, Xuejiao Wang, Jin Zhang, Zhou Yang, Longyi Fan, Yanan An and Renguo Guan
Nanomaterials 2022, 12(15), 2629; https://doi.org/10.3390/nano12152629 - 30 Jul 2022
Cited by 1 | Viewed by 1549
Abstract
Magnetic chitosan hydrogel has aroused immense attention in recent years due to their biomedical significance and magnetic responsiveness. Here, A new electrodeposition method is reported for the fabrication of a novel CuNi-based magnetic chitosan freestanding film (MCFF) in an acidic chitosan plating bath [...] Read more.
Magnetic chitosan hydrogel has aroused immense attention in recent years due to their biomedical significance and magnetic responsiveness. Here, A new electrodeposition method is reported for the fabrication of a novel CuNi-based magnetic chitosan freestanding film (MCFF) in an acidic chitosan plating bath containing SDS-modified CuNi NPs. Contrary to chitosan’s anodic and cathodic deposition, which typically involves electrochemical oxidation, the synthetic process is triggered by coordination of chitosan with Cu and Ni ions in situ generated by the controlled surface dissolution of the suspended NPs with the acidic plating bath. The NPs provide not only the ions required for chitosan growth but also become entrapped during electrodeposition, thereby endowing the composite with magnetic properties. The obtained MCFF offers a wide range of features, including good mechanical strength, magnetic properties, homogeneity, and morphological transparency. Besides the fundamental interest of the synthesis itself, sufficient mechanical strength ensures that the hydrogel can be used by either peeling it off of the electrode or by directly building a complex hydrogel electrode. Its fast and easy magnetic steering, separation and recovery, large surface area, lack of secondary pollution, and strong chelating capability could lead to it finding applications as an electrochemical detector or adsorbent. Full article
(This article belongs to the Special Issue Hybrid Magnetic Nanomaterials)
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15 pages, 4746 KiB  
Article
Effect of Liquid Crystalline Host on Structural Changes in Magnetosomes Based Ferronematics
by Peter Bury, Marek Veveričík, František Černobila, Matúš Molčan, Katarína Zakuťanská, Peter Kopčanský and Milan Timko
Nanomaterials 2021, 11(10), 2643; https://doi.org/10.3390/nano11102643 - 8 Oct 2021
Cited by 9 | Viewed by 1495
Abstract
The effect of the liquid crystalline host on structural changes in magnetosomes based on ferronematics is studied using the surface acoustic wave (SAW) technique supported by some capacitance and light transmission measurements. The measurement of the attenuation response of SAW propagating along the [...] Read more.
The effect of the liquid crystalline host on structural changes in magnetosomes based on ferronematics is studied using the surface acoustic wave (SAW) technique supported by some capacitance and light transmission measurements. The measurement of the attenuation response of SAW propagating along the interface between LC and the piezoelectric substrate is used to study processes of structural changes under magnetic field. The magnetosome nanoparticles of the same volume concentration were added to three different nematic LCs, 5CB, 6CB, and E7. Unlike to undoped LCs, the different responses of SAW attenuation under the influence of magnetic and electric fields in LCs doped with magnetosomes were observed due to characteristic structural changes. The decrease of the threshold field for doped LCs as compared with pure LCs and slight effects on structural changes were registered. The threshold magnetic fields of LCs and composites were determined from capacitance measurements, and the slight shift to lower values was registered for doped LCs. The shift of nematic-isotropic transition was registered from dependencies of SAW attenuation on temperature. The acoustic anisotropy measurement approved the previous supposition about the role of bulk viscosity in used SAW measurements. In addition, capacitance and light transmition investigations supported SAW results and pointed out conclusions about their magnetic field behavior. Obtained results are discussed and confronted with previous ones and coincide well with those observed using acoustic, optical, or dielectric techniques. Full article
(This article belongs to the Special Issue Hybrid Magnetic Nanomaterials)
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