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Magnetic and Structural Properties of Ferromagnetic Thin Films

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Thin Films and Interfaces".

Deadline for manuscript submissions: closed (10 December 2022) | Viewed by 11830

Special Issue Editors


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Guest Editor
Institut Matériaux Microélectronique Nanosciences de Provence (IM2NP); Aix-Marseille Université, Marseille, France
Interests: magnetic textures in nanostructures; ferromagnetic resonance; spintronics

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Guest Editor
CNRS, IM2NP (UMR 7334), Institut Matériaux Microélectronique et Nanisciences de Provence; Aix-Marseille Université, 13013 Marseille, France
Interests: strongly correlated magnets; low dimensional magnets; electron paramagnetic resonance; quantum coherence; multiferroics; ferromagnetic resonance; electron spin qubits
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Special Issue Information

Dear Colleagues,

Thin film magnetism has led to fundamental advances in the physics of magnetism as well as important technological applications. With the rapid development of deposition and characterisation techniques, new phenomena were discovered, such as the GMR effect, which made a crucial contribution to the storage technology which paved the way for growing research on spin-dependent phenomena and the emergence of the field of spintronics. Spintronic devices rely on the control of spin-polarized currents which, on a magnetic film, may induce magnetization reversal or dynamics without the need for an external magnetic field.

This Special Issue is dedicated to magnetic properties of thin films such as fundamental properties, e.g., the magnetic moment and magnetic anisotropy. It will cover phenomena including, but not limited to, those that arise from the spin-orbit coupling that encompasses magnetocrystalline anisotropy, magnetic damping/relaxation, orbital moment or spin-orbit torques.

This field is in continuous evolution. Authors are invited to submit original articles, communications, and reviews for this Special Issue.

Dr. Voicu Octavian Dolocan
Dr. Sylvain Bertaina
Guest Editors

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

  • ferromagnetic thin films
  • magnetic properties
  • magnetic anisotropy
  • magnetic damping
  • magnetic textures/skyrmions
  • ferromagnetic resonance
  • spin-orbit phenomena
  • magnetization dynamics
  • structural properties

Published Papers (5 papers)

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Research

9 pages, 3750 KiB  
Article
Magnetic Properties of GaAs/NiFe Coaxial Core-Shell Structures
by Eduard V. Monaico, Vadim Morari, Maksim Kutuzau, Veaceslav V. Ursaki, Kornelius Nielsch and Ion M. Tiginyanu
Materials 2022, 15(18), 6262; https://doi.org/10.3390/ma15186262 - 9 Sep 2022
Cited by 4 | Viewed by 1305
Abstract
Uniform nanogranular NiFe layers with Ni contents of 65%, 80%, and 100% have been electroplated in the potentiostatic deposition mode on both planar substrates and arrays of nanowires prepared by the anodization of GaAs substrates. The fabricated planar and coaxial core-shell ferromagnetic structures [...] Read more.
Uniform nanogranular NiFe layers with Ni contents of 65%, 80%, and 100% have been electroplated in the potentiostatic deposition mode on both planar substrates and arrays of nanowires prepared by the anodization of GaAs substrates. The fabricated planar and coaxial core-shell ferromagnetic structures have been investigated by means of scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). To determine the perspectives for applications, a comparative analysis of magnetic properties, in terms of the saturation and remanence moment, the squareness ratio, and the coercivity, was performed for structures with different Ni contents. Full article
(This article belongs to the Special Issue Magnetic and Structural Properties of Ferromagnetic Thin Films)
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8 pages, 3781 KiB  
Article
Micromagnetic Study on Branch Hybridizations of Spin-Wave Modes in Ferromagnetic Nanostrips
by Binghui Yin, Mingming Yang, Xiaoyan Zeng and Ming Yan
Materials 2022, 15(17), 6144; https://doi.org/10.3390/ma15176144 - 5 Sep 2022
Cited by 2 | Viewed by 1351
Abstract
Magnonics is an emerging field in spintronics, aiming at the development of new-concept magnetic devices processing information via the manipulation of spin waves (SWs) in magnetic nanostructures. One of the most popular SW waveguides exploited currently is ferromagnetic nanostrips. Due to quantization caused [...] Read more.
Magnonics is an emerging field in spintronics, aiming at the development of new-concept magnetic devices processing information via the manipulation of spin waves (SWs) in magnetic nanostructures. One of the most popular SW waveguides exploited currently is ferromagnetic nanostrips. Due to quantization caused by the lateral confinements, the dispersion of SWs propagating in a strip is characterized by a multi-branched structure. Consequently, SWs excited in the system involve superpositions of degenerate modes from different branches of the dispersion curves. In this work, we theoretically study the SW branch hybridization effect for two types of excitation methods, either by using a local oscillating magnetic field or a fast-moving field pulse. The former is based on the resonance effect and the latter on the Cherenkov-like emission mechanism. Micromagnetic simulations yield a variety of SW profiles with rather complex structures, which can be well explained by mode superpositions. These results draw attention to the significance of the SW branch hybridization effect when dealing with SWs in nanostrips and provide new aspects for the manipulation of SWs. Full article
(This article belongs to the Special Issue Magnetic and Structural Properties of Ferromagnetic Thin Films)
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12 pages, 2860 KiB  
Article
Tuning of Magnetic Damping in Y3Fe5O12/Metal Bilayers for Spin-Wave Conduit Termination
by Adam Krysztofik, Nikolai Kuznetsov, Huajun Qin, Lukáš Flajšman, Emerson Coy and Sebastiaan van Dijken
Materials 2022, 15(8), 2814; https://doi.org/10.3390/ma15082814 - 12 Apr 2022
Cited by 6 | Viewed by 2439
Abstract
In this work, we investigate the structural and dynamic magnetic properties of yttrium iron garnet (YIG) films grown onto gadolinium gallium garnet (GGG) substrates with thin platinum, iridium, and gold spacer layers. Separation of the YIG film from the GGG substrate by a [...] Read more.
In this work, we investigate the structural and dynamic magnetic properties of yttrium iron garnet (YIG) films grown onto gadolinium gallium garnet (GGG) substrates with thin platinum, iridium, and gold spacer layers. Separation of the YIG film from the GGG substrate by a metal film strongly affects the crystalline structure of YIG and its magnetic damping. Despite the presence of structural defects, however, the YIG films exhibit a clear ferromagnetic resonance response. The ability to tune the magnetic damping without substantial changes to magnetization offers attractive prospects for the design of complex spin-wave conduits. We show that the insertion of a 1-nm-thick metal layer between YIG and GGG already increases the effective damping parameter enough to efficiently absorb spin waves. This bilayer structure can therefore be utilized for magnonic waveguide termination. Investigating the dispersionless propagation of spin-wave packets, we demonstrate that a damping unit consisting of the YIG/metal bilayers can dissipate incident spin-wave signals with reflection coefficient R < 0.1 at a distance comparable to the spatial width of the wave packet. Full article
(This article belongs to the Special Issue Magnetic and Structural Properties of Ferromagnetic Thin Films)
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9 pages, 1276 KiB  
Article
Electron-Phonon Coupling Parameter of Ferromagnetic Metal Fe and Co
by Kyuhwe Kang and Gyung-Min Choi
Materials 2021, 14(11), 2755; https://doi.org/10.3390/ma14112755 - 23 May 2021
Cited by 7 | Viewed by 2441
Abstract
The electron-phonon coupling (g) parameter plays a critical role in the ultrafast transport of heat, charge, and spin in metallic materials. However, the exact determination of the g parameter is challenging because of the complicated process during the non-equilibrium state. In [...] Read more.
The electron-phonon coupling (g) parameter plays a critical role in the ultrafast transport of heat, charge, and spin in metallic materials. However, the exact determination of the g parameter is challenging because of the complicated process during the non-equilibrium state. In this study, we investigate the g parameters of ferromagnetic 3d transition metal (FM) layers, Fe and Co, using time-domain thermoreflectance. We measure a transient increase in temperature of Au in an FM/Au bilayer; the Au layer efficiently detects the strong heat flow during the non-equilibrium between electrons and phonons in FM. The g parameter of the FM is determined by analyzing the temperature dynamics using thermal circuit modeling. The determined g values are 8.8–9.4 × 1017 W m−3 K−1 for Fe and 9.6–12.2 × 1017 W m−3 K−1 for Co. Our results demonstrate that all 3d transition FMs have a similar g value, in the order of 1018 W m−3 K−1. Full article
(This article belongs to the Special Issue Magnetic and Structural Properties of Ferromagnetic Thin Films)
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9 pages, 746 KiB  
Article
Magnetic Anisotropy and Damping Constant of Ferrimagnetic GdCo Alloy near Compensation Point
by Sungjung Joo, Rekikua Sahilu Alemayehu, Jong-Guk Choi, Byong-Guk Park and Gyung-Min Choi
Materials 2021, 14(10), 2604; https://doi.org/10.3390/ma14102604 - 17 May 2021
Cited by 10 | Viewed by 3398
Abstract
Metallic ferrimagnets with rare earth-transition metal alloys can provide novel properties that cannot be obtained using conventional ferromagnets. Recently, the compensation point of ferrimagnets, where the net magnetization or net angular momentum vanishes, has been considered a key aspect for memory device applications. [...] Read more.
Metallic ferrimagnets with rare earth-transition metal alloys can provide novel properties that cannot be obtained using conventional ferromagnets. Recently, the compensation point of ferrimagnets, where the net magnetization or net angular momentum vanishes, has been considered a key aspect for memory device applications. For such applications, the magnetic anisotropy energy and damping constant are crucial. In this study, we investigate the magnetic anisotropy and damping constant of a GdCo alloy, with a Gd concentration of 12–27%. By analyzing the equilibrium tilting of magnetization as a function of the applied magnetic field, we estimate the uniaxial anisotropy to be 1–3 × 104 J m−3. By analyzing the transient dynamics of magnetization as a function of time, we estimate the damping constant to be 0.08–0.22. Full article
(This article belongs to the Special Issue Magnetic and Structural Properties of Ferromagnetic Thin Films)
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