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Micromachines
Special Issues
Magnetic Materials and Devices
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Magnetic Materials and Devices

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 2403

Special Issue Editors

Prof. Dr. Lucio Strazzabosco Dorneles

E-Mail Website1 Website2
Guest Editor
Physics Department, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil
Interests: magnetism; biomaterials; thin films
Prof. Dr. Artur Harres De Oliveira

E-Mail Website1 Website2
Guest Editor
Physics Department, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil
Interests: spintronics; skyrmions; exchange bias

Special Issue Information

Dear Colleagues,

Nanosized magnetic materials are key components for devices that find applications in microelectronics, bioengineering, data science, computing, telecommunications, and medicine.

Novel and exciting magnetic phenomena have been observed in the past few decades, and they will certainly be useful in designing devices that might revolutionize those fields in the future.

Ranging from memories based on skyrmion manipulation to ultrafast resonant devices, the search for potential applications is challenging. We are looking for studies discussing potential applications of magnetic systems with at least one nanometric dimension, based on phenomena such as exchange bias, spin dependent transport, topologically protected spin textures, or antiferromagnetic resonance.

This Special Issue seeks to showcase communications, research papers, and review articles that focus on magnetic systems with technological appeal, not necessarily presenting a working device.

Prof. Dr. Lucio Strazzabosco Dorneles
Prof. Dr. Artur Harres De Oliveira
Guest Editors

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 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. Micromachines 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 2600 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

  • spintronics
  • skyrmions
  • exchange bias
  • multilayered thin films
  • nanoparticles
  • ferromagnetic resonance
  • antiferromagnetic resonance
  • magnetoimpedance

Published Papers (3 papers)

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Research

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20 pages, 12516 KiB  
Article
Passive Electrical Components Based on Cotton Fabric Decorated with Iron Oxides Microfibers: The Influence of Static and Pulsed Magnetic Fields on the Equivalent Electrical Properties
by Ioan Bica, Eugen Mircea Anitas, Hyoung-Jin Choi and Shizhao Wang
Micromachines 2023, 14(11), 2061; https://doi.org/10.3390/mi14112061 - 04 Nov 2023
Viewed by 737
Abstract
In this work, environmentally friendly and low-cost passive electrical components (PECs) are manufactured based on composites consisting of cotton fabrics soaked with solutions of silicone oil and different amounts of iron oxides microfibers (μFe). The μFe consists of a mixture [...] Read more.
In this work, environmentally friendly and low-cost passive electrical components (PECs) are manufactured based on composites consisting of cotton fabrics soaked with solutions of silicone oil and different amounts of iron oxides microfibers (μFe). The μFe consists of a mixture of three phases: hematite (α-Fe2O3), maghemite (γ-Fe2O3), and magnetite (Fe3O4). The equivalent electrical capacitance (Cp) and resistance (Rp) of PECs are measured as a function of magnetic flux density B in a static and pulsed magnetic field superimposed on an alternating electric field of frequency 1 kHz. The relative variation in the hysteresis curves for both Cp and Rp are obtained by measuring them in the ascending and then the descending mode of B. We show that all these three quantities are sensibly influenced by the volume fractions of μFe and by the values of B. The main influence on this behavior is attributed to the semiconductor properties of the α-Fe2O3 and γ-Fe2O3 components of the oxide microfibers. In addition, it is found that at B≃ 175 mT, the maximum relative variance of the hysteresis curve is about 3.35% for Cp and 3.18 % for Rp. When a pulsed magnetic field is used, it is shown that Cp and Rp closely follow the variation in the magnetic field. Thus, the resulting electrical properties of PECs, together with the fast response to the application of pulsed magnetic fields, make them useful in the fabrication of various devices, such as electric, magnetic, and deformation fields, or mechanical stress sensors with applications in protection against electromagnetic smog, healthcare monitoring, or for human–machine interfacing. Full article
(This article belongs to the Special Issue Magnetic Materials and Devices)
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10 pages, 2109 KiB  
Article
Lattice Deformation of Tb0.29Dy0.71Fe1.95 Alloy during Magnetization
by Jiaxin Gong, Jiheng Li, Xiaoqian Bao and Xuexu Gao
Micromachines 2023, 14(10), 1861; https://doi.org/10.3390/mi14101861 - 28 Sep 2023
Viewed by 713
Abstract
In Tb-Dy-Fe alloy systems, Tb0.29Dy0.71Fe1.95 alloy shows giant magnetostrictive properties under low magnetic fields, thus having great potential for transducer and sensor applications. In this work, the lattice parameters of Tb0.29Dy0.71Fe1.95 compounds as [...] Read more.
In Tb-Dy-Fe alloy systems, Tb0.29Dy0.71Fe1.95 alloy shows giant magnetostrictive properties under low magnetic fields, thus having great potential for transducer and sensor applications. In this work, the lattice parameters of Tb0.29Dy0.71Fe1.95 compounds as a function of a magnetic field were investigated using in situ X-ray diffraction under an applied magnetic field. The results showed that the c-axis elongation of the rhombohedral unit cell was the dominant contributor to magnetostriction at a low magnetic field (0–500 Oe). As the magnetic field intensity increased from 500 Oe to 1500 Oe, although the magnetostrictive coefficient continued to increase, the lattice constant did not change, which indicated that the elongated c-axis of the rhombohedral unit cell rotated in the direction of the magnetic field. This rotation mainly contributed to the magnetostriction phenomenon at magnetic fields of above 500 Oe. The structural origin of the magnetostriction performance of these materials was attributed to the increase in rhombohedral lattice parameters and the rotation of the extension axis of the rhombohedral lattice. Full article
(This article belongs to the Special Issue Magnetic Materials and Devices)
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Review

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17 pages, 907 KiB  
Review
Recent Developments in Magnetic Hyperthermia Therapy (MHT) and Magnetic Particle Imaging (MPI) in the Brain Tumor Field: A Scoping Review and Meta-Analysis
by Frederika Rentzeperis, Daniel Rivera, Jack Y. Zhang, Cole Brown, Tirone Young, Benjamin Rodriguez, Alexander Schupper, Gabrielle Price, Jack Gomberg, Tyree Williams, Alexandros Bouras and Constantinos Hadjipanayis
Micromachines 2024, 15(5), 559; https://doi.org/10.3390/mi15050559 - 24 Apr 2024
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Abstract
Magnetic hyperthermia therapy (MHT) is a promising treatment modality for brain tumors using magnetic nanoparticles (MNPs) locally delivered to the tumor and activated with an external alternating magnetic field (AMF) to generate antitumor effects through localized heating. Magnetic particle imaging (MPI) is an [...] Read more.
Magnetic hyperthermia therapy (MHT) is a promising treatment modality for brain tumors using magnetic nanoparticles (MNPs) locally delivered to the tumor and activated with an external alternating magnetic field (AMF) to generate antitumor effects through localized heating. Magnetic particle imaging (MPI) is an emerging technology offering strong signal-to-noise for nanoparticle localization. A scoping review was performed by systematically querying Pubmed, Scopus, and Embase. In total, 251 articles were returned, 12 included. Articles were analyzed for nanoparticle type used, MHT parameters, and MPI applications. Preliminary results show that MHT is an exciting treatment modality with unique advantages over current heat-based therapies for brain cancer. Effective application relies on the further development of unique magnetic nanoparticle constructs and imaging modalities, such as MPI, that can enable real-time MNP imaging for improved therapeutic outcomes. Full article
(This article belongs to the Special Issue Magnetic Materials and Devices)
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