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Search Results (5)

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Keywords = magneto-optical spin Hall effect

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12 pages, 3782 KiB  
Article
Structural, Magnetic and THz Emission Properties of Ultrathin Fe/L10-FePt/Pt Heterostructures
by Claudiu Locovei, Garik Torosyan, Evangelos Th. Papaioannou, Alina D. Crisan, Rene Beigang and Ovidiu Crisan
Nanomaterials 2025, 15(14), 1099; https://doi.org/10.3390/nano15141099 - 16 Jul 2025
Viewed by 289
Abstract
Recent achievements in ultrafast spin physics have enabled the use of heterostructures composed of ferromagnetic (FM)/non-magnetic (NM) thin layers for terahertz (THz) generation. The mechanism of THz emission from FM/NM multilayers has been typically ascribed to the inverse spin Hall effect (ISHE). In [...] Read more.
Recent achievements in ultrafast spin physics have enabled the use of heterostructures composed of ferromagnetic (FM)/non-magnetic (NM) thin layers for terahertz (THz) generation. The mechanism of THz emission from FM/NM multilayers has been typically ascribed to the inverse spin Hall effect (ISHE). In this work, we probe the mechanism of the ISHE by inserting a second ferromagnetic layer in the form of an alloy between the FM/NM system. In particular, by utilizing the co-sputtering technique, we fabricate Fe/L10-FePt/Pt ultra-thin heterostructures. We successfully grow the tetragonal phase of FePt (L10-phase) as revealed by X-ray diffraction and reflection techniques. We show the strong magnetic coupling between Fe and L10-FePt using magneto-optical and Superconducting Quantum Interference Device (SQUID) magnetometry. Subsequently, by utilizing THz time domain spectroscopy technique, we record the THz emission and thus we the reveal the efficiency of spin-to-charge conversion in Fe/L10-FePt/Pt. We establish that Fe/L10-FePt/Pt configuration is significantly superior to the Fe/Pt bilayer structure, regarding THz emission amplitude. The unique trilayer structure opens new perspectives in terms of material choices for the future spintronic THz sources. Full article
(This article belongs to the Special Issue Ferroelectricity, Multiferroicity, and Magnetism in Low-Dimensional Nanomaterials)
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29 pages, 7028 KiB  
Review
Recent Progress in Two-Dimensional Magnetic Materials
by Guangchao Shi, Nan Huang, Jingyuan Qiao, Xuewen Zhang, Fulong Hu, Hanwei Hu, Xinyu Zhang and Jingzhi Shang
Nanomaterials 2024, 14(21), 1759; https://doi.org/10.3390/nano14211759 - 1 Nov 2024
Cited by 2 | Viewed by 5249
Abstract
The giant magnetoresistance effect in two-dimensional (2D) magnetic materials has sparked substantial interest in various fields; including sensing; data storage; electronics; and spintronics. Their unique 2D layered structures allow for the manifestation of distinctive physical properties and precise performance regulation under different conditions. [...] Read more.
The giant magnetoresistance effect in two-dimensional (2D) magnetic materials has sparked substantial interest in various fields; including sensing; data storage; electronics; and spintronics. Their unique 2D layered structures allow for the manifestation of distinctive physical properties and precise performance regulation under different conditions. In this review, we present an overview of this rapidly developing research area. Firstly, these 2D magnetic materials are catalogued according to magnetic coupling types. Then, several vital effects in 2D magnets are highlighted together with theoretical investigation, such as magnetic circular dichroism, magneto-optical Kerr effect, and anomalous Hall effect. After that, we forecast the potential applications of 2D magnetic materials for spintronic devices. Lastly, research advances in the attracting magnons, skyrmions and other spin textures in 2D magnets are discussed. Full article
(This article belongs to the Section 2D and Carbon Nanomaterials)
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13 pages, 7519 KiB  
Article
Magneto-Optical Spin Hall Effect Regulation at Terahertz Frequencies Based on Graphene–Gold Heterojunction
by Li Luo, Junlin Guo, Sui Peng, Bo Liu, Yuting Wang and Xiao Liu
Crystals 2023, 13(1), 78; https://doi.org/10.3390/cryst13010078 - 1 Jan 2023
Viewed by 2102
Abstract
In this paper, we theoretically consider the magneto-optical spin Hall effect of light (MOSHEL) in a graphene–gold heterojunction structure at terahertz frequencies, and determine the maximum value of the transverse shift of the spin Hall effect of light (SHEL) in the designed structure [...] Read more.
In this paper, we theoretically consider the magneto-optical spin Hall effect of light (MOSHEL) in a graphene–gold heterojunction structure at terahertz frequencies, and determine the maximum value of the transverse shift of the spin Hall effect of light (SHEL) in the designed structure by varying the terahertz frequency, the thickness of the metal layer, the Fermi energy level of the graphene, and the magnetic induction density. When the terahertz frequency was 1.2 THz, the metal layer thickness 50 nm, the Fermi level 0.2 eV, and the magnetic induction density B was 10 T, the SHEL shifts of left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) components was greatest at the critical angle (58°), with as value of 498μm, 1000 times larger than the visible light. At this point, graphene exhibited a significant magneto-optical effect, dramatically enhancing the splitting extrema of LHCP and RHCP. This structure will provide possibilities for enhancement of the transverse shift and efficient regulation of the optical spin Hall effect within the terahertz range. Full article
(This article belongs to the Special Issue Optical Crystals: Optical Properties and Applications in the Terahertz Range)
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8 pages, 1759 KiB  
Article
Ferromagnetic Resonance of a [GeTe/Sb2Te3]6/Py Superlattice
by Satoshi Sumi, Yuichiro Hirano, Hiroyuki Awano and Junji Tominaga
Magnetochemistry 2021, 7(12), 156; https://doi.org/10.3390/magnetochemistry7120156 - 26 Nov 2021
Cited by 2 | Viewed by 2956
Abstract
A [GeTe/Sb2Te3] superlattice is known as a topological insulator. It shows magnetic responses such as magneto-optical effect, magneto resistance, magneto capacitance, and so on. We have reported that [GeTe/Sb2Te3] superlattice film has a large spin–orbit [...] Read more.
A [GeTe/Sb2Te3] superlattice is known as a topological insulator. It shows magnetic responses such as magneto-optical effect, magneto resistance, magneto capacitance, and so on. We have reported that [GeTe/Sb2Te3] superlattice film has a large spin–orbit interaction using a spin pumping method of a [GeTe/Sb2Te3]/Py superlattice. In this paper, we demonstrate a ST-FMR (spin transfer torque ferromagnetic resonance) of the [GeTe/Sb2Te3]6/Py superlattice, compared with a W/Py bilayer. The superlattice film showed a large resonance signal with a symmetric component. The ratio of symmetric components (S) to anti-symmetric (A) components (S/A) was 1.4, which suggests that the superlattice exhibits a large spin Hall angle. The [GeTe/Sb2Te3] superlattice will be suitable as a hetero-interface material required for high performance spintronics devices in future. Full article
(This article belongs to the Section Spin Crossover and Spintronics)
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32 pages, 5263 KiB  
Review
Ultrasensitive Magnetic Field Sensors for Biomedical Applications
by Dmitry Murzin, Desmond J. Mapps, Kateryna Levada, Victor Belyaev, Alexander Omelyanchik, Larissa Panina and Valeria Rodionova
Sensors 2020, 20(6), 1569; https://doi.org/10.3390/s20061569 - 11 Mar 2020
Cited by 193 | Viewed by 24025
Abstract
The development of magnetic field sensors for biomedical applications primarily focuses on equivalent magnetic noise reduction or overall design improvement in order to make them smaller and cheaper while keeping the required values of a limit of detection. One of the cutting-edge topics [...] Read more.
The development of magnetic field sensors for biomedical applications primarily focuses on equivalent magnetic noise reduction or overall design improvement in order to make them smaller and cheaper while keeping the required values of a limit of detection. One of the cutting-edge topics today is the use of magnetic field sensors for applications such as magnetocardiography, magnetotomography, magnetomyography, magnetoneurography, or their application in point-of-care devices. This introductory review focuses on modern magnetic field sensors suitable for biomedicine applications from a physical point of view and provides an overview of recent studies in this field. Types of magnetic field sensors include direct current superconducting quantum interference devices, search coil, fluxgate, magnetoelectric, giant magneto-impedance, anisotropic/giant/tunneling magnetoresistance, optically pumped, cavity optomechanical, Hall effect, magnetoelastic, spin wave interferometry, and those based on the behavior of nitrogen-vacancy centers in the atomic lattice of diamond. Full article
(This article belongs to the Special Issue Magnetic Sensing Technology, Materials and Applications)
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