Special Issue "Magnetic Nanoparticles and Nanodevices"

A special issue of Condensed Matter (ISSN 2410-3896). This special issue belongs to the section "Magnetism".

Deadline for manuscript submissions: 1 November 2021.

Special Issue Editors

Prof. Tomasz Blachowicz
E-Mail Website
Guest Editor
Institute of Physics – Center for Science and Education, Silesian University of Technology, Konarskiego 22B str., 44-100 Gliwice, Poland
Interests: elastic and magnetic phenomena in low-dimensional structures; magnetic anisotropies; magnetization reversal; nanoelectronics; micromagnetic simulations
Prof. Dr. Andrea Ehrmann
E-Mail Website
Guest Editor
Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
Interests: biopolymers; electrospinning; magnetism; spintronics; optics; dye-sensitized solar cells (DSSCs); smart textiles
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Special Issue Information

Dear Colleagues,

Magnetic nanoparticles are intensively investigated in basic research as well as for diverse applications. On the one hand, due to their small dimensions, the shape anisotropy plays an important role since it competes with exchange contribution, which can be used to tailor the overall anisotropy and thus magnetization reversal processes. On the other hand, magnetic nanostructures are often included in nanodevices for different applications, e.g., in magnetic random access memories (MRAM) and generally in spin valves, in the Racetrack memory and as bit patterned media in a novel type of memories, as well as in other, diverse spintronics devices.

Investigations of single magnetic nanoparticles are possible through magnetic force microscopy and through a few other specialized techniques based on X-rays, while ensembles or arrays can be investigated by more common thin layer technologies. Micromagnetic simulations, on the other hand, can be used to investigate in detail the full magnetization reversal processes, possible nucleation of domain walls, vortices or even skyrmions, and their propagation due to an external magnetic or electric field.

For this Special Issue, we are interested in original research or comprehensive review manuscripts, dealing with all facets of experimental and theoretical investigations of magnetic nanoparticles and nanodevices. Papers of high quality are welcome and will be carefully reviewed.

Prof. Tomasz Blachowicz
Prof. Andrea Ehrmann
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 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. Condensed Matter is an international peer-reviewed open access quarterly 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 1400 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
  • nanodevices
  • spintronics
  • magnetism
  • magnetic anisotropies
  • magnetization reversal
  • domain walls
  • vortices
  • magnetic memory
  • magnetic skyrmions

Published Papers (3 papers)

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Research

Article
Micromagnetic Simulation of Round Ferromagnetic Nanodots with Varying Roughness and Symmetry
Condens. Matter 2021, 6(2), 19; https://doi.org/10.3390/condmat6020019 - 26 May 2021
Viewed by 473
Abstract
Magnetic nanodots are of high interest for basic research due to their broad spectrum of possible magnetic states and magnetization reversal processes. Besides, they are of technological interest since they can be applied in magnetic data storage, especially if vortex states occur in [...] Read more.
Magnetic nanodots are of high interest for basic research due to their broad spectrum of possible magnetic states and magnetization reversal processes. Besides, they are of technological interest since they can be applied in magnetic data storage, especially if vortex states occur in closed dots or open rings. While producing such nanorings and nanodots from diverse magnetic materials by lithographic techniques is quite common nowadays, these production technologies are naturally prone to small deviations of the borders of these nanoparticles. Here we investigate the influence of well-defined angular-dependent roughness of the edges, created by building the nanoparticles from small cubes, on the resulting hysteresis loops and magnetization reversal processes in five different round nanodots with varying open areas, from a thin ring to a closed nanodot. By varying the orientation of the external magnetic field, the impact of the angle-dependent roughness can be estimated. Especially for the thinnest ring, significant dependence of the transverse magnetization component on the field orientation can be found. Full article
(This article belongs to the Special Issue Magnetic Nanoparticles and Nanodevices)
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Article
Magnetization Reversal in Concave Iron Nano-Superellipses
Condens. Matter 2021, 6(2), 17; https://doi.org/10.3390/condmat6020017 - 12 May 2021
Viewed by 382
Abstract
Square magnetic nanodots can show intentional or undesired shape modifications, resulting in superellipses with concave or convex edges. Some research groups also concentrated on experimentally investigating or simulating concave nano-superellipses, sometimes called magnetic astroids due to their similarity to the mathematical shape of [...] Read more.
Square magnetic nanodots can show intentional or undesired shape modifications, resulting in superellipses with concave or convex edges. Some research groups also concentrated on experimentally investigating or simulating concave nano-superellipses, sometimes called magnetic astroids due to their similarity to the mathematical shape of an astroid. Due to the strong impact of shape anisotropy in nanostructures, the magnetization-reversal process including coercive and reversibility fields can be expected to be different in concave or convex superellipses than that in common squares. Here, we present angle-dependent micromagnetic simulations on magnetic nanodots with the shape of concave superellipses. While magnetization reversal occurs via meander states, horseshoe states or the 180° rotation of magnetization for the perfect square, depending on the angle of the external magnetic field, more complicated states occur for superellipses with strong concaveness. Even apparently asymmetric hysteresis loops can be found along the hard magnetization directions, which can be attributed to measuring minor loops since the reversibility fields become much larger than the coercive fields. Full article
(This article belongs to the Special Issue Magnetic Nanoparticles and Nanodevices)
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Article
Asymmetric Hysteresis Loops in Co Thin Films
Condens. Matter 2020, 5(4), 71; https://doi.org/10.3390/condmat5040071 - 05 Nov 2020
Cited by 3 | Viewed by 784
Abstract
Asymmetric magnetic hysteresis loops are usually found in exchange bias (EB) systems, typically after field cooling a system below the Néel temperature of an antiferromagnet exchange coupled to a ferromagnet. Alternatively, asymmetric hysteresis loops may occur due to undetected minor loops or in [...] Read more.
Asymmetric magnetic hysteresis loops are usually found in exchange bias (EB) systems, typically after field cooling a system below the Néel temperature of an antiferromagnet exchange coupled to a ferromagnet. Alternatively, asymmetric hysteresis loops may occur due to undetected minor loops or in systems with a rotational anisotropy. Here, we report on an exchange bias thin film system MgO(100)/Co/CoO, examined at room temperature, which is far above the blocking temperature, by the magneto-optical Kerr effect (MOKE). While the longitudinal hysteresis loops partly show steps which are well-known from diverse purely ferromagnetic systems, the transverse hysteresis loops exhibit clear asymmetries, similar to exchange biased systems at low temperatures, and unusual transverse magnetization values at saturation. Since minor loops and a rotational anisotropy can be excluded in this case, this asymmetry can possibly be a residue of the exchange bias coupling at lower temperatures. Full article
(This article belongs to the Special Issue Magnetic Nanoparticles and Nanodevices)
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