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Applied Sciences
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Low-Dimensional Magnetic Systems: Physical Principles and Technological Applications
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Low-Dimensional Magnetic Systems: Physical Principles and Technological Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 6282

Special Issue Editor

Prof. Dr. Roberto Zivieri

E-Mail Website1 Website2
Guest Editor
1. Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, Messina, Italy
2. Istituto Nazionale di Alta, Matematica (INdAM), Unit of Messina, Messina, Italy
3. Department of Physics and Earth Sciences, University of Ferrara, 44122 Ferrara, Italy
Interests: solid state physics; crystal lattices; phonon dynamics; magnetic materials and magnetism; magnetic properties; spin waves in confined systems; chemical composition of magnetic materials; magnonic crystals; spintronics; phase transitions; magnetic and seismic metamaterials; superconductivity; high-temperature superconductivity; superfluidity; low-temperature physics; X-ray diffraction; statistical physics and statistical thermodynamics; topological defects; vortices and skyrmions in condensed matter systems; biological physics; biological chemistry; biomathematics and statistical methods applied to medicine; quantum magnetics and acoustic sensors; underwater physics; oceanography; physics of the atmosphere; geophysics; electric distribution networks; electrical engineering and applications
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Special Issue Information

Dear Colleagues,

In the last few years, magnetic materials have attracted the attention of both experimentalists and theorists working in the field of magnetism for their intriguing properties exhibited at the nanoscale level. The underlying physics of complex magnetization dynamics in spintronics, magnonics, and spinorbitronics has been widely studied to implement several technological and industrial applications like magnetic memories, microwave oscillators, modulators, sensors, logic gates, diodes, and transistors. After the first observation of magnetic skyrmions forming in out-of-plane magnetized films under various stimuli such as magnetic fields, electric currents, and temperature gradients, the study of the interplay between topology and physics in low-dimensional magnetic systems via the spin-transfer-torque and spin-Hall effects has opened the route to the fabrication of spintronic devices.

The aim of this Special Issue is to attract world-leading scientists to present the latest exciting theoretical and experimental results in the field of low-dimensional magnetic systems with special regard to magnonics, spintronics, and spinorbitronics discussing their underlying physics in different magnetic configurations and suggesting concrete applications. The accepted contributions will include theoretical developments, experimental observations and measurements, and potential applications.

Prof. Dr. Roberto Zivieri
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 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. Applied Sciences 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 2400 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

  • low-dimensional magnetic systems
  • magnonic crystals
  • spin-wave excitations
  • spin-transfer torque
  • magnetic skyrmions
  • Dzyaloshinskii–Moriya interaction
  • spin-polarized current
  • spin-transfer-torque effect
  • spin-Hall effect

Published Papers (2 papers)

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Research

18 pages, 3867 KiB  
Article
Micromagnetic Modeling of All Optical Switching of Ferromagnetic Thin Films: The Role of Inverse Faraday Effect and Magnetic Circular Dichroism
by Victor Raposo, Rodrigo Guedas, Felipe García-Sánchez, M. Auxiliadora Hernández, Marcelino Zazo and Eduardo Martínez
Appl. Sci. 2020, 10(4), 1307; https://doi.org/10.3390/app10041307 - 14 Feb 2020
Cited by 4 | Viewed by 3444
Abstract
There is a lot of experimental evidence of All Optical Switching (AOS) by applying ultrashort laser pulses on ferromagnetic thin films with perpendicular magnetic anisotropy. However, the physical origin behind these processes remains under debate. In addition to the heating caused by the [...] Read more.
There is a lot of experimental evidence of All Optical Switching (AOS) by applying ultrashort laser pulses on ferromagnetic thin films with perpendicular magnetic anisotropy. However, the physical origin behind these processes remains under debate. In addition to the heating caused by the laser pulses, the Inverse Faraday Effect (IFE) and Magnetic Circular Dichroism (MCD) have been proposed as the most probable phenomena responsible for the observations of helicity-dependent AOS. Here, we review the influence of both phenomena by means of realistic micromagnetic simulations based on the Landau–Lifshitz–Bloch equation coupled to the heat transport caused by the laser heating. The analysis allows us to reveal the similarities and differences between both effects. While both mechanisms may lead to the local inversion of the initial magnetic state of a ferromagnetic sample submitted to a train of circularly polarized laser pulses, the Inverse Faraday Effect proves to be more efficient for nucleation and domain wall movement and it reproduces more accurately the different magnetic configurations that the experiments report for different values of the fluence of the laser beam. Full article
(This article belongs to the Special Issue Low-Dimensional Magnetic Systems: Physical Principles and Technological Applications)
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17 pages, 1636 KiB  
Article
Statistical Properties and Configurational Entropy of a Two-Dimensional Néel Magnetic Skyrmions Population
by Roberto Zivieri
Appl. Sci. 2020, 10(1), 352; https://doi.org/10.3390/app10010352 - 3 Jan 2020
Cited by 5 | Viewed by 2048
Abstract
The study of the thermodynamic properties of topological defects is important not only for understanding their magnetic properties but also for suggesting novel applications. In this paper, the statistical and statistical thermodynamic properties of a population of Néel magnetic skyrmion diameters hosted in [...] Read more.
The study of the thermodynamic properties of topological defects is important not only for understanding their magnetic properties but also for suggesting novel applications. In this paper, the statistical and statistical thermodynamic properties of a population of Néel magnetic skyrmion diameters hosted in an ultrathin cylindrical dot is determined within a two-dimensional analytical approach. The statistical properties such as the skyrmion size are calculated in the region of skyrmion metastability and are compared with the ones obtained using a recent three-dimensional analytical approach based on the analogy with the Maxwell–Boltzmann distribution of dilute gas molecules. The investigation of the statistical thermodynamic properties focus on the calculation of the configurational entropy at thermodynamic equilibrium determined in the continuous limit from the Boltzmann order function. While the statistical properties are quantitatively similar passing from the two-dimensional to the three-dimensional approach, the configurational entropy calculated from the two-dimensional skyrmions distribution is considerably lower than the one obtained from the three-dimensional skyrmions distribution. Because of the strong resemblance between the statistical configurational entropy and Jaynes’s information entropy, it is suggested to use magnetic skyrmions as temperature and external field dependent information entropy carriers for a future potential technological application in the field of low-dimensional magnetic systems and skyrmionics. Full article
(This article belongs to the Special Issue Low-Dimensional Magnetic Systems: Physical Principles and Technological Applications)
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