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Nanomaterials
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Nano-Magnets and Nano-Magnetisms
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Nano-Magnets and Nano-Magnetisms

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 16034

Special Issue Editors

Prof. Dr. Xingsen Gao

E-Mail Website
Guest Editor
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, China
Interests: ferroelectric; multiferroic; nanodot; topological domain
Dr. Zhipeng Hou

E-Mail Website
Guest Editor
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, China
Interests: ferromagnetism; multiferroic; topological ferromagnetic domain; skyrmions

Special Issue Information

Dear Colleagues,

The past decade has witnessed fast development in the field of low-dimension magnetic systems, such as nanodots, nanowires, thin film and two-dimensional materials, which have become a cutting-edge area in magnetism. This field has garnered tremendous research interests in both fundamental physics (e.g., unique nanoscale topological domain states, electrical modulation of nano-magnetisms, geometrical confinement effects) as well as practical device applications (e.g., magnetic logic devices, random access memories, racetrack memories).

Despite these advances, there are yet many open issues to be addressed. For instance, it is still very challenging to achieve energy-efficient, multi-state, nonvolatile switching of nanomagnetic domains (e.g., topological domain states), in situ observation and controlled manipulation of nano-magnetisms in antiferromagnetic/ferromagnetic magnetic systems, room-temperature magnetism in two-dimensional magnetic systems, as well as emerging phenomena in association with nano-magnets and nanodomains.

This Special Issue aims to address a broad range of fundamental physics and practical applications referring to nanomagnets and nanomagnetism. The Special Issue will include experimental, theoretical, as well as numerical work. All article types including original research, review articles, and perspectives on the developing direction of this field are welcome.

Prof. Dr. Xingsen Gao
Dr. Zhipeng Hou
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. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • Nanomagnetism
  • Magnetic nanodomains
  • Low-dimensional magnetic system
  • Topological spin configuration
  • Multifield manipulation of magnetism

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Published Papers (5 papers)

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Research

12 pages, 3018 KiB  
Article
Engineering the Exchange Spin Waves in Graded Thin Ferromagnetic Films
by Igor Yanilkin, Amir Gumarov, Igor Golovchanskiy, Bulat Gabbasov, Roman Yusupov and Lenar Tagirov
Nanomaterials 2022, 12(24), 4361; https://doi.org/10.3390/nano12244361 - 7 Dec 2022
Cited by 2 | Viewed by 1616
Abstract
The results of experimental and theoretical studies of standing spin waves in a series of epitaxial films of the ferromagnetic Pd1−xFex alloy (0.02 < x < 0.11) with different distributions of the magnetic properties across the thickness are presented. [...] Read more.
The results of experimental and theoretical studies of standing spin waves in a series of epitaxial films of the ferromagnetic Pd1−xFex alloy (0.02 < x < 0.11) with different distributions of the magnetic properties across the thickness are presented. Films with linear and stepwise, as well as more complex Lorentzian, sine and cosine profiles of iron concentration in the alloy, and thicknesses from 20 to 400 nm are considered. A crucial influence of the magnetic properties profile on the spectrum of spin wave resonances is demonstrated. A capability of engineering the standing spin waves in graded ferromagnetic films for applications in magnonics is discussed. Full article
(This article belongs to the Special Issue Nano-Magnets and Nano-Magnetisms)
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10 pages, 5079 KiB  
Article
A Novel Method to Synthesize Co/Fe3O4 Nanocomposites with Optimal Magnetic and Microwave Performance
by Chi Zhang, Yao Wang, Yun Chen, Yatao Wang, Peng Wang and Qiong Wu
Nanomaterials 2022, 12(16), 2764; https://doi.org/10.3390/nano12162764 - 12 Aug 2022
Cited by 4 | Viewed by 1682
Abstract
The magnetic interactions between neighboring magnetic nanoparticles make the synthesis of nanocomposites made of two kinds of magnetic nanoparticles extremely difficult. In this paper, to achieve an effective nanocomposite of Co and Fe3O4 nanoparticles, a special urchin-like Co nanomatrix was [...] Read more.
The magnetic interactions between neighboring magnetic nanoparticles make the synthesis of nanocomposites made of two kinds of magnetic nanoparticles extremely difficult. In this paper, to achieve an effective nanocomposite of Co and Fe3O4 nanoparticles, a special urchin-like Co nanomatrix was used to prepare the Co/Fe3O4 nanocomposites. The Fe3O4 nanoparticles are evenly embedded into the branches of the CO clusters, bringing the two types of particles into close contact and ensuring the optimal magnetic and microwave properties. The electromagnetic (EM) parameters at 1–18 GHz and the magnetic loss tangents can be effectively modulated, and the absorption frequency bands of the EM waves are shifted to the X-Ku bands (8–18 GHz) from the S-C bands (2–8 GHz) after the Fe3O4 nanoparticles are compounded. Full article
(This article belongs to the Special Issue Nano-Magnets and Nano-Magnetisms)
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10 pages, 1202 KiB  
Article
Transverse Magnetoresistance Induced by the Nonuniformity of Superconductor
by Duo Zhao, Zhiyuan Zhao, Yaohan Xu, Shucheng Tong, Jun Lu and Dahai Wei
Nanomaterials 2022, 12(8), 1313; https://doi.org/10.3390/nano12081313 - 12 Apr 2022
Cited by 1 | Viewed by 2306
Abstract
The transverse magnetoresistance (Rxy) caused by inhomogeneous superconductivity is symmetric about the magnetic field around the critical magnetic field region. This has caused many disturbances during the study of vortex dynamics by Hall signals. Here, we found that the peak [...] Read more.
The transverse magnetoresistance (Rxy) caused by inhomogeneous superconductivity is symmetric about the magnetic field around the critical magnetic field region. This has caused many disturbances during the study of vortex dynamics by Hall signals. Here, we found that the peak of Rxy measured in our samples was induced by the nonuniformity of the superconductors. The peak values of Rxy decrease with increasing applied current and temperature, which can be described by the theory of superconductivity inhomogeneity. Based on this, we have proposed and verified a method for separating the transverse voltage caused by the inhomogeneity of superconductivity. Additionally, quantity ΔB(0) can also be used to characterize the uniformity of superconductivity. This clears up the obstacles for studying vortex motion dynamics and reveals a way to study the influence of the domain wall on superconductivity. Full article
(This article belongs to the Special Issue Nano-Magnets and Nano-Magnetisms)
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14 pages, 4085 KiB  
Article
Manipulation of Skyrmion Motion Dynamics for Logical Device Application Mediated by Inhomogeneous Magnetic Anisotropy
by Jia-Qiang Lin, Ji-Pei Chen, Zhen-Yu Tan, Yuan Chen, Zhi-Feng Chen, Wen-An Li, Xing-Sen Gao and Jun-Ming Liu
Nanomaterials 2022, 12(2), 278; https://doi.org/10.3390/nano12020278 - 16 Jan 2022
Cited by 8 | Viewed by 2940
Abstract
Magnetic skyrmions are promising potential information carriers for future spintronic devices owing to their nanoscale size, non-volatility and high mobility. In this work, we demonstrate the controlled manipulation of skyrmion motion and its implementation in a new concept of racetrack logical device by [...] Read more.
Magnetic skyrmions are promising potential information carriers for future spintronic devices owing to their nanoscale size, non-volatility and high mobility. In this work, we demonstrate the controlled manipulation of skyrmion motion and its implementation in a new concept of racetrack logical device by introducing an inhomogeneous perpendicular magnetic anisotropy (PMA) via micromagnetic simulation. Here, the inhomogeneous PMA can be introduced by a capping nano-island that serves as a tunable potential barriers/well which can effectively modulate the size and shape of isolated skyrmion. Using the inhomogeneous PMA in skyrmion-based racetrack enables the manipulation of skyrmion motion behaviors, for instance, blocking, trapping or allowing passing the injected skyrmion. In addition, the skyrmion trapping operation can be further exploited in developing special designed racetrack devices with logic AND and NOT, wherein a set of logic AND operations can be realized via skyrmion–skyrmion repulsion between two skyrmions. These results indicate an effective method for tailoring the skyrmion structures and motion behaviors by using inhomogeneous PMA, which further provide a new pathway to all-electric skyrmion-based memory and logic devices. Full article
(This article belongs to the Special Issue Nano-Magnets and Nano-Magnetisms)
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6 pages, 787 KiB  
Article
Magnon Torque Transferred into a Magnetic Insulator through an Antiferromagnetic Insulator
by Zhiren Chen, Zehan Chen, Xiaotian Zhao, Baoshan Cui, Hongnan Zheng, Lin Liu, Wei Jia, Tianhui Li, Zhixiang Ye, Mingxia Qiu, Ning Wang, Lei Ma and Hongyu An
Nanomaterials 2021, 11(11), 2766; https://doi.org/10.3390/nano11112766 - 20 Oct 2021
Viewed by 6567
Abstract
Electrical spin-orbit torque (SOT) in magnetic insulators (MI) has been intensively studied due to its advantages in spin-orbitronic devices with ultralow energy consumption. However, the magnon torque in the MIs, which has the potential to further lower the energy consumption, still remains elusive. [...] Read more.
Electrical spin-orbit torque (SOT) in magnetic insulators (MI) has been intensively studied due to its advantages in spin-orbitronic devices with ultralow energy consumption. However, the magnon torque in the MIs, which has the potential to further lower the energy consumption, still remains elusive. In this work, we demonstrate the efficient magnon torque transferred into an MI through an antiferromagnetic insulator. By fabricating a Pt/NiO/Tm3Fe5O12 heterostructure with different NiO thicknesses, we have systematically investigated the evolution of the transferred magnon torque. We show that the magnon torque efficiency transferred through the NiO into the MI can retain a high value (∼50%), which is comparable to the previous report for the magnon torque transferred into the metallic magnet. Our study manifests the feasibility of realizing the pure magnon-based spin-orbitronic devices with ultralow energy consumption and high efficiency. Full article
(This article belongs to the Special Issue Nano-Magnets and Nano-Magnetisms)
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