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Advances in Spintronics of Noncollinear Magnets

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 April 2023) | Viewed by 3872

Special Issue Editor


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Guest Editor
Physics Department, Technical University of Munich, 85748 Garching, Germany
Interests: magnetization dynamics; topological quantum materials; spin-transport phenomenon and nanotechnology

Special Issue Information

Dear Colleagues,

The term noncollinear magnetic materials refers to the class of materials in which the direction of spins depends on position in such a way that there is no specific direction in which all the spins are aligned (anti)parallel. This spin arrangement can be coplanar or noncoplanar, including systems with spin spirals and helicoids, canted spins and skyrmions. These noncollinear spin structures, which produce real-space or momentum-space Berry phases, can give rise to novel physical phenomena including the topological Hall effect, anomalous Hall effect, spin-polarized current, spin Hall effect, multiferroicity and Weyl fermions.

Noncollinear magnetic materials have attracted considerable attention in recent years due to the non-trivial nature of their magnetic structures. Nevertheless, their application to the emerging field of spintronics requires coherent efforts of the community.

This Special Issue calls for original research and review articles on key developments of noncollinear magnets for spintronics. This includes novel theoretical developments towards the understanding of noncollinear spin effects and experimental works utilizing these effects to realize novel spintronic applications and device functionalities. Research topics of interest include, but are not limited to:

1) Electric-field control of the noncollinear spin structure and the detection of spin-polarized currents;

2) Anisotropic magnetoresistance and domain-wall-related magnetoresistance effects;

3) Possible applications with coupled noncollinear and collinear magnetic systems in spintronics;

4) Dynamic excitation such as spin waves, surface acoustic waves and microwaves in spintronic devices;

5) Review and perspective articles for future research on spintronics of noncollinear magnets.

Dr. Aisha Aqeel
Guest Editor

Manuscript Submission Information

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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. Materials 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 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

  • noncollinear spin interaction
  • spin-momentum locking
  • non-reciprocity of spin waves
  • spin pumping
  • spin diode effect
  • helical magnetic phases
  • spin Hall effect
  • skyrmions
  • magnetoresistance
  • topological hall effect

Published Papers (2 papers)

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Research

9 pages, 3147 KiB  
Article
Mixed-Type Skyrmions in Symmetric Pt/Co/Pt Multilayers at Room Temperature
by Min He, Tiankuo Xu, Yang Gao, Chaoqun Hu, Jianwang Cai and Ying Zhang
Materials 2022, 15(22), 8272; https://doi.org/10.3390/ma15228272 - 21 Nov 2022
Cited by 2 | Viewed by 1581
Abstract
We demonstrate the generation of mixed-type skyrmions (all are about 200 nm) that are primarily Bloch-type, hybrid-type, and a negligible amount of Néel-type in symmetric Pt/Co(1.55)/Pt multilayers at room temperature. The magnetic field dependence of skyrmion evolution is reversible. Brillouin light-scattering is used [...] Read more.
We demonstrate the generation of mixed-type skyrmions (all are about 200 nm) that are primarily Bloch-type, hybrid-type, and a negligible amount of Néel-type in symmetric Pt/Co(1.55)/Pt multilayers at room temperature. The magnetic field dependence of skyrmion evolution is reversible. Brillouin light-scattering is used to quantitatively quantify the Dzyaloshinskii-Moriya interaction constant D in order to comprehend the mechanism. Interestingly, the D value is high enough to generate skyrmions in a symmetric sandwich structure. Micromagnetic simulations show that Néel-type skyrmions transform into Bloch-type skyrmions as the D value decreases. The interface-induced non-uniform D may be the cause to generate mixed-type skyrmions. This work broadens the flexibility to generate skyrmions by engineering skyrmion-based devices with nominally symmetric multilayers without the requirement of very large DMI. Full article
(This article belongs to the Special Issue Advances in Spintronics of Noncollinear Magnets)
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10 pages, 2960 KiB  
Article
Theoretical Investigation of Skyrmion Dynamics in Pt/Co/MgO Nanodots
by Djoudi Ourdani, Mohamed Belmeguenai, Mihai Gabor, Andrey Stashkevich and Yves Roussigné
Materials 2022, 15(21), 7474; https://doi.org/10.3390/ma15217474 - 25 Oct 2022
Viewed by 1460
Abstract
In this article, we present a numerical study on stabilization and eigenmodes of the so-called skyrmion chiral spin texture in nanometric dots. The first aim of this study is to identify the appropriate multilayer in a set of Pt/Co/MgO structures with different Co [...] Read more.
In this article, we present a numerical study on stabilization and eigenmodes of the so-called skyrmion chiral spin texture in nanometric dots. The first aim of this study is to identify the appropriate multilayer in a set of Pt/Co/MgO structures with different Co thicknesses that have been previously experimentally characterized. Stabilization occurs if the energy favoring skyrmions is greater than the geometric mean of the exchange and anisotropy energies. Both the energy favoring skyrmions and the anisotropy contribution depend on the Co thickness. The appropriate multilayer is obtained for a specific Co thickness. MuMax simulations are used to calculate the precise static magnetization configuration for the experimental parameters, allowing us select the appropriate structure. Moreover, in view of experimental study of skyrmion dynamics by means of Brillouin light scattering, the eigenfrequency, eigenmode profile, and spectral density are calculated for different dot sizes. Finally, the optimal dot size that allows for a feasible experiment is obtained. Full article
(This article belongs to the Special Issue Advances in Spintronics of Noncollinear Magnets)
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