Article
Chemistry, Multidisciplinary
Igor Yanilkin, Amir Gumarov, Igor Golovchanskiy, Bulat Gabbasov, Roman Yusupov, Lenar Tagirov
Summary: Experimental and theoretical studies were conducted on standing spin waves in epitaxial films of the ferromagnetic Pd1-xFex alloy with different distributions of the magnetic properties. The influence of the magnetic profile on the spin wave resonances was demonstrated, and the potential application of engineering standing spin waves in graded ferromagnetic films was discussed.
Article
Physics, Multidisciplinary
Eva Schmoranzerova, Jozef Kimak, Richard Schlitz, Sebastian T. B. Goennenwein, Dominik Kriegner, Helena Reichlova, Zbynek Soban, Gerhard Jakob, Er-Jia Guo, Mathias Klaeui, Markus Muenzenberg, Petr Nemec, Tomas Ostatnicky
Summary: All-optical ferromagnetic resonance (AO-FMR) is used to detect micromagnetic parameters in yttrium iron garnet (YIG) thin films with a metallic capping layer (Au, Pt) by triggering magnetization precession through heating of the metallic layer with femtosecond laser pulses. The laser-induced precession corresponds to a uniform (Kittel) magnon mode, allowing for the measurement of local magnetic properties with a resolution determined by the laser spot size.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Alain Portavoce, Elie Assaf, Maxime Bertoglio, Dario Narducci, Sylvain Bertaina
Summary: Magnetic materials can be used to produce thermoelectric materials using spin-related effects, but a clear understanding of the interrelation between localized magnetic moments (μ(I)), free carriers, and Seebeck coefficient (S) is necessary for efficient material design. In this study, we investigate the influence of μ(I) on the spin-dependent S of model ferromagnetic thin films, allowing independent investigation of μ(I) thermal fluctuations, ordering, and density variation influence. We find that the influence of μ(I) on free carrier polarization is of utmost importance for S: efficient coupling of free carrier spin and localized magnetic moment promotes an increase in S, while spin-dependent relaxation time difference between the two spin-dependent conduction channels leads to a decrease in S. Our findings support new avenues for thermoelectric material design based on spin-related effects in ferromagnetic materials.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
S. Azzawi, A. Umerski, L. C. Sampaio, S. A. Bunyaev, G. N. Kakazei, D. Atkinson
Summary: Previous theory suggested that different monolayers within transition metal ferromagnet thin-films contribute different amounts to the total ferromagnetic damping. This study aimed to investigate if electronic engineering of the higher damping regions through localized doping could reduce the thin-film damping. Theoretical analysis and experimental results for sputtered Co thin-films with locally doped upper and lower surface regions with Cr were presented, showing a reduction in damping with increasing local doping up to 30% Cr, and a further decrease in damping with higher local doping potentially due to changes in the film structure. This work paves the way for the creation of low-damping magnetic thin-films.
Article
Materials Science, Multidisciplinary
R. C. Rai, C. Horvatits, S. Deer
Summary: The study reveals that hexagonal HoFeO3 thin films exhibit weak ferromagnetism at low temperatures and a spin reorientation transition caused by Ho3+-Fe3+ interactions. Electronic excitations include Fe3+ d to d on-site transitions and charge transfer excitations from O 2p to Fe 3d, Ho 6s, and 5d.
Article
Physics, Applied
S. M. Bleser, R. M. Greening, M. J. Roos, L. A. Hernandez, X. Fan, B. L. Zink
Summary: Spin-to-charge conversion is a crucial process in spintronics, and this study demonstrates effective spin-to-charge conversion in thermally evaporated chromium thin films. Comparisons with sputtered Pt films show comparable conversion effects, and the opposite sign of the signal indicates a negative spin Hall angle for chromium. The study also reveals the influence of strain state on the conversion efficiency and suggests the possible impact of spin density wave antiferromagnetism in chromium.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
A. Quesada, G. Chen, A. T. N'Diaye, P. Wang, Y. Z. Wu, A. K. Schmid
Summary: CO adsorption on ultrathin film results in a two-stage effect on magnetic properties, initially enhancing perpendicular magnetic anisotropy and later causing magnetization rotation towards in-plane. This CO-induced spin reorientation transition is irreversible and reveals the complexity of adsorbate induced SRT near critical points.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
H. J. Waring, Y. Li, C. Moutafis, I. J. Vera-Marun, T. Thomson
Summary: Researchers have found that synthetic ferromagnets have a unique layer structure, where the dynamic response of the ferromagnetic layers is closely related to the difference in magnetization and interlayer coupling. Experimental results demonstrate that conventional acoustic and optical descriptions do not fully capture the complexities of synthetic ferromagnets' dynamics.
Article
Chemistry, Physical
Aleksei S. Komlev, Dmitriy Y. Karpenkov, Dmitry A. Kiselev, Tatiana S. Ilina, Alisa Chirkova, Radel R. Gimaev, Takamasa Usami, Tomoyasu Taniyama, Vladimir Zverev, Nikolai S. Perov
Summary: This study comprehensively characterized the nucleation and evolution of the ferromagnetic phase in the thin Fe49Rh51 film on a MgO substrate near the antiferromagnetic (AFM) to ferromagnetic (FM) phase transition, utilizing measurements of temperature, time, and magnetic field dependencies. The observed relaxation processes of magnetization indicate the nucleation of the FM phase on the film surface and its growth towards the film-substrate interface. The confirmation of FM phase growth evolution was verified through vibrational magnetometry and magnetic force microscopy methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Maciej Dabrowski, Robert J. Hicken, Andreas Frisk, David G. Newman, Christoph Klewe, Alpha T. N'Diaye, Padraic Shafer, Gerrit van der Laan, Thorsten Hesjedal, Graham J. Bowden
Summary: Non-collinear spin structures in [Co/Pt]/Pt/Py films with an additional Pt spacer for coupling control were studied using VNA-FMR and XFMR techniques. Results showed slight pinning of Py dynamic magnetization by [Co/Pt], with observation of PSSW, CSSW, and HSSW states morphing under reduced magnetic field. The CSSW modes are particularly relevant for microwave assisted magnetic recording applications.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Shanquan Chen, Jhong-Yi Chang, Qinghua Zhang, Qiuyue Li, Ting Lin, Fanqi Meng, Haoliang Huang, Yangyang Si, Shengwei Zeng, Xinmao Yin, My Ngoc Duong, Yalin Lu, Lang Chen, Er-Jia Guo, Hanghui Chen, Chun-Fu Chang, Chang-Yang Kuo, Zuhuang Chen
Summary: The spin state of Co ions in epitaxial LaCoO3 thin films under tensile strain has been determined to have mixed high-spin and low-spin states, while it is practically a low-spin state under compressive strain. The identification of this spin state ratio explains the origin of ferromagnetism in LaCoO3 films. This study highlights the importance of spin state degrees of freedom and thin-film strain engineering in creating new physical properties that do not exist in bulk materials.
Article
Chemistry, Multidisciplinary
Meng Zhao, Yifan Zhao, Yaojin Li, Guohua Dong, Zhexi He, Yujing Du, Yuxuan Jiang, Shaoyuan Wu, Chenying Wang, Libo Zhao, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: This study investigates the tunability of spin waves in Co60Al40-alloyed film with natural light. The results show that the critical angle and ferromagnetic resonance field can be shifted under illumination, leading to changes in magnetic anisotropy. The control of spin-wave resonance by sunlight can be understood by the effective photoelectron-doping-induced change of the surface magnetic anisotropy. The study demonstrates the potential of developing sunlight-tunable magnonics/spintronics devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Meng Zhao, Yifan Zhao, Yaojin Li, Guohua Dong, Zhexi He, Yujing Du, Yuxuan Jiang, Shaoyuan Wu, Chenying Wang, Libo Zhao, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: It has been discovered that natural light can modulate spin waves in Co60Al40-alloyed film, enabling reversible switching behavior. This work has significant implications for the development of future sunlight-tunable magnonics/spintronics devices.
ADVANCED MATERIALS
(2023)
Article
Instruments & Instrumentation
Ning Wang, Guofeng Zhu, Zhiqiang Hu, Xuewei Ju, Haobin Su, Feng Huang, Qi Chen, Yiming Cao, Xiangfeng Wang
Summary: In this study, time-domain terahertz magneto-optical spectroscopy was used to investigate spin resonance in a c-cut TmFeO3 single crystal. The behavior of the crystal under different magnetic fields was characterized. By selectively exciting magnetic resonance modes, it was found that the quasi-ferromagnetic mode of the crystal shifted towards higher frequencies as the magnetic field increased, while the quasi-antiferromagnetic mode transformed into the quasi-ferromagnetic mode at low critical magnetic fields.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
I. A. Armijo, R. E. Arias
Summary: This study investigates the relation between surface properties of ferromagnetic films and the propagation of spin waves. The frequencies of spin waves are experimentally determined and their relation with surface properties validates and derives parameters of models. Different parameters are varied to test the relation, and the effects of surface properties on spin waves are significant for certain angles of inclination of the applied magnetic field. The results have important implications for defining film thickness and understanding the influence of spin waves.
Article
Engineering, Electrical & Electronic
A. V. Chumak, P. Kabos, M. Wu, C. Abert, C. Adelmann, A. O. Adeyeye, J. Akerman, F. G. Aliev, A. Anane, A. Awad, C. H. Back, A. Barman, G. E. W. Bauer, M. Becherer, E. N. Beginin, V. A. S. V. Bittencourt, Y. M. Blanter, P. Bortolotti, I. Boventer, D. A. Bozhko, S. A. Bunyaev, J. J. Carmiggelt, R. R. Cheenikundil, F. Ciubotaru, S. Cotofana, G. Csaba, O. V. Dobrovolskiy, C. Dubs, M. Elyasi, K. G. Fripp, H. Fulara, I. A. Golovchanskiy, C. Gonzalez-Ballestero, P. Graczyk, D. Grundler, P. Gruszecki, G. Gubbiotti, K. Guslienko, A. Haldar, S. Hamdioui, R. Hertel, B. Hillebrands, T. Hioki, A. Houshang, C. -M. Hu, H. Huebl, M. Huth, E. Iacocca, M. B. Jungfleisch, G. N. Kakazei, A. Khitun, R. Khymyn, T. Kikkawa, M. Klaui, O. Klein, J. W. Klos, S. Knauer, S. Koraltan, M. Kostylev, M. Krawczyk, I. N. Krivorotov, V. V. Kruglyak, D. Lachance-Quirion, S. Ladak, R. Lebrun, Y. Li, M. Lindner, R. Macedo, S. Mayr, G. A. Melkov, S. Mieszczak, Y. Nakamura, H. T. Nembach, A. A. Nikitin, S. A. Nikitov, V. Novosad, J. A. Otalora, Y. Otani, A. Papp, B. Pigeau, P. Pirro, W. Porod, F. Porrati, H. Qin, B. Rana, T. Reimann, F. Riente, O. Romero-Isart, A. Ross, A. V. Sadovnikov, A. R. Safin, E. Saitoh, G. Schmidt, H. Schultheiss, K. Schultheiss, A. A. Serga, S. Sharma, J. M. Shaw, D. Suess, O. Surzhenko, K. Szulc, T. Taniguchi, M. Urbanek, K. Usami, A. B. Ustinov, T. van der Sar, S. van Dijken, V. I. Vasyuchka, R. Verba, S. Viola Kusminskiy, Q. Wang, M. Weides, M. Weiler, S. Wintz, S. P. Wolski, X. Zhang
Summary: Magnonics is a discipline that explores the physical properties of spin waves and utilizes them for data processing. It offers several advantages, such as scalability to atomic dimensions, operation in high-frequency ranges, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS technology. Although primarily in the academic domain, extensive research is being conducted to address the scientific and technological challenges, with several proof-of-concept prototypes already realized in laboratories.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Nanoscience & Nanotechnology
Cesar Gonzalez-Ruano, Coriolan Tiusan, Michel Hehn, Farkhad G. Aliev
Summary: The article introduces a mechanism based on spin orbit coupling-controlled interfacial states, which effectively enhances TMR by applying bias in V/MgO/Fe/MgO/Fe/Co hybrids, paving the way for new spintronic device schemes.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Aoran Zhou, Yuanzhe Li, Shouheng Zhang, Yicong Huang, Qian Xue, Le Wang, Guoxia Zhao, Derang Cao, Jie Xu, Zhejun Jin, Weihua Zong, Xia Wang, Shandong Li, Guo-Xing Miao
Summary: FeCoB/Ru/FeCoB trilayers with uniaxial magnetic anisotropy were deposited on (011)-cut lead magnesium niobate-lead titanate single crystal ferroelectric substrates using compositional gradient sputtering method, achieving ultrahigh optical mode resonance frequencies. The electric-field controlled switch of magnetic moment configuration was realized by competition between two orthogonal magnetic anisotropic fields, leading to reversible 90 degrees rotation of optical mode resonance intensity under applied E-field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Diego Caso, Farkhad G. Aliev
Summary: In this study, the propagation characteristics of edge spin waves in triangle-shaped amorphous YIG micron-sized ferromagnets were investigated through numerical simulations. It was found that when the aperture angle coincides with one of the localized domain wall modes, the transmission performance of edge spin waves is maximized and shows resonant transmission. The obtained results are consistent with existing theoretical models.
SN APPLIED SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Zhaohui Li, Hengjun Liu, Zhiqiang Zhao, Qinghua Zhang, Xingke Fu, Xiangkun Li, Fangchao Gu, Hai Zhong, Yuanyuan Pan, Guihuan Chen, Qinghao Li, Hongsen Li, Yanxue Chen, Lin Gu, Kuijuan Jin, Shishen Yan, Guo-xing Miao, Chen Ge, Qiang Li
Summary: Ferromagnetic metals have the potential for use in ultralow-power-consumption spintronic devices due to their high Curie temperature and robust magnetization. However, there is a lack of reliable solutions for giant and reversible voltage control of magnetism in ferromagnetic metal films. In this study, a novel space-charge approach is proposed, which allows for achieving a large modulation of magnetism in Co/TiO2 multilayer granular films under low voltage. The results demonstrate the potential of this approach in modulating magnetism in ferromagnetic metals and pave the way for the development of ionic-magnetic-electric coupled applications.
ADVANCED MATERIALS
(2023)
Article
Geosciences, Multidisciplinary
M. A. Nosov, K. A. Sementsov, S. Kolesov, V. V. Pryadun
Summary: The manifestations and propagation of the atmospheric Lamb wave caused by the explosive eruption of the Hunga Tonga-Hunga HaModified Letter Turned Commaapai volcano on January 15, 2022, in the Pacific region were investigated using data from deep ocean sea level stations and ground-based barographs. The study also made theoretical estimations of the amplitude of the Lamb wave and the surface gravity waves excited in the ocean.
DOKLADY EARTH SCIENCES
(2022)
Article
Physics, Applied
Rabiul Islam, Peng Li, Marijan Beg, Manoj Sachdev, Guo-Xing Miao
Summary: In this study, a helimagnet-based emerging memory device design is presented, which can store multiple bits of information per device. The device consists of a helimagnet layer placed between two ferromagnetic layers, allowing specific spin configurations to be locked in. The writing of memory states is simulated by applying an in-plane magnetic field that rotates and transforms the spin configurations of the device. By simply changing the direction of the field, multi-bit data storage per unit memory cell can be achieved.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Cesar Gonzalez-Ruano, Diego Caso, Jabir Ali Ouassou, Coriolan Tiusan, Yuan Lu, Jacob Linder, Farkhad G. Aliev
Summary: Superconductor-ferromagnet tunnel junctions have been used to engineer ultrasensitive terahertz radiation detectors by exploiting their giant thermoelectric effects. In this study, we experimentally observe complete magnetic control over the thermoelectric effects in a superconducting spin valve, including a dependence on the magnetism of the spin valve. The application of high in-plane magnetic fields leads to a double sign inversion of the thermoelectric effect, which remains large even at fields twice the superconducting critical field.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
David Sanchez-Manzano, S. Mesoraca, F. Cuellar, M. Cabero, S. Rodriguez-Corvillo, V Rouco, F. Mompean, M. Garcia-Hernandez, J. M. Gonzalez-Calbet, C. Feuillet-Palma, N. Bergeal, J. Lesueur, C. Leon, Javier E. Villegas, J. Santamaria
Summary: The recent discovery of a long-range unconventional Josephson effect between YBa2Cu3O7 high Tc cuprates separated by a manganite ferromagnet has revealed a novel triplet proximity effect. The temperature dependence of the critical current in planar Josephson junctions was examined, and it was found that the behavior of the critical current follows the predictions of traditional superconductor-normal metal-superconductor junctions, suggesting that triplet pairs in a ferromagnet are transported similarly to singlet pairs in a normal metal. This result calls for theoretical studies of the new triplet Josephson effect and highlights its potential in future superconducting spintronics.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Hengjun Liu, Fangchao Gu, Xiancheng Sang, Yuanyuan Han, Feihu Zou, Zhaohui Li, Yufeng Qin, Li Cai, Yuanyuan Pan, Qiang Cao, Guo-xing Miao, Qiang Li
Summary: In this study, FeO nanoparticles were prepared based on the lithium-battery reaction mechanism, and operando magnetometry measurements were carried out. The results showed strong ferromagnetism and a high Curie temperature of nanosized FeO, attributed to surface frustration and the surface-bulk exchange interaction. These findings confirm the surface ferromagnetism of FeO and provide valuable insights for the design of spintronic devices.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Diego Caso, Pablo Tuero, Javier Garcia, Konstantin Y. Guslienko, Farkhad G. Aliev
Summary: By adjusting parameters such as the length of the nanowire, excitation frequency, microwave pulse duration, and spin-current value, reversible transitions between single-vortex and Bloch-point vortex structures can be achieved, enabling fast and efficient switching of nanomagnets in magnetic memories.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Edwin Herrera, Beilun Wu, Evan O'Leary, Alberto M. Ruiz, Miguel Agueda, Pablo Garcia Talavera, Victor Barrena, Jon Azpeitia, Carmen Munuera, Mar Garcia-Hernandez, Lin-Lin Wang, Adam Kaminski, Paul C. Canfield, Jose J. Baldovi, Isabel Guillamon, Hermann Suderow
Summary: The orthorhombic compound AuSn4 is similar to the Dirac node arc semimetal PtSn4 in composition. Unlike PtSn4, AuSn4 is a superconductor with a critical temperature of T-c = 2.35 K. Recent measurements indicate quasi-two-dimensional superconducting behavior in AuSn4.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Roberto Munoz, Laia Leon-Boigues, Elena Lopez-Elvira, Carmen Munuera, Luis Vazquez, Federico Mompean, Jose Angel Martin-Gago, Irene Palacio, Mar Garcia-Hernandez
Summary: The modification of graphene surface with polymers allows for expanding its applications as a hybrid material. However, the chemical inertness of graphene poses a challenge for covalent functionalization. Researchers have developed a clean and scalable method to enhance the graphene chemical activity and synthesized a large-scale graphene-polymer hybrid material.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Multidisciplinary
M. A. Nosov, K. A. Sementsov, S. V. Kolesov, V. V. Pryadun
Summary: This paper presents a theoretical analysis of wave motions in the ocean induced by traveling disturbances of atmospheric pressure. Formulas for a fixed-depth ocean have been derived to describe the bottom pressure variations resulting from these disturbances. Additionally, formulas have been derived to estimate the amplitude of free gravity waves generated in the ocean by traveling atmospheric disturbances in regions of abrupt depth changes. Using data from ground-based barographs and DART stations, the study investigates the manifestation of atmospheric Lamb waves in bottom pressure variations caused by the explosive eruption of the Hunga Tonga-Hunga Ha'apai volcano on January 15, 2022. The results show that Lamb waves are indeed manifested in bottom pressure variations and exhibit amplification, with consistent waveforms recorded by the barographs and pressure sensors. A Lamb wave with an amplitude of 500 Pa can excite surface gravity waves with an amplitude of 0.5 m in deepwater trench regions.
MOSCOW UNIVERSITY PHYSICS BULLETIN
(2022)
Article
Materials Science, Multidisciplinary
Jabir Ali Ouassou, Cesar Gonzalez-Ruano, Diego Caso, Farkhad G. Aliev, Jacob Linder
Summary: Giant thermoelectric effects can be achieved at the interface between superconductors and strongly polarized ferromagnets, allowing for efficient control of thermopower using a magnetic input signal. The thermopower can be toggled on and off, and even reversed, providing in situ control that differs from conventional thermoelectrics.
