Article
Physics, Applied
Nikita Strelkov, Anatoly Vedyaev, Natalia Ryzhanova, Bernard Dieny
Summary: In this study, the thermally induced fluctuations of spin accumulation were theoretically investigated in the diffusive regime. It was found that the paramagnetic resonance can occur in the spin-current carrying channel due to electron-electron interactions and exchange splitting induced by spin accumulation. Frequency dependence of the magnetic susceptibility and signal-to-noise ratio were calculated analytically for a specific T-shaped lateral spin-valve structure.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Tom Lichtenberg, Youri L. W. van Hees, Maarten Beens, Caspar J. Levels, Reinoud Lavrijsen, Rembert A. Duine, Bert Koopmans
Summary: Several rare-earth transition-metal ferrimagnetic systems exhibit all-optical magnetization switching upon excitation with a femtosecond laser pulse. The role of nonlocal spin transport in these systems is scarcely understood. In this study, the contribution of rare-earth materials to the generated spin currents was investigated using Co/Gd and Co/Tb bilayers. The results indicate a significant contribution of Gd to the spin current, while Tb does not contribute.
Article
Physics, Multidisciplinary
Yujun Zhang, Tsukasa Katayama, Akira Chikamatsu, Christian Schuessler-Langeheine, Niko Pontius, Yasuyuki Hirata, Kou Takubo, Kohei Yamagami, Keisuke Ikeda, Kohei Yamamoto, Tetsuya Hasegawa, Hiroki Wadati
Summary: Investigation of ultrafast dynamic behaviors can provide novel insights about the coupling mechanisms among multiple degrees of freedom in condensed matters. Here, the authors investigate a photo-induced antiferromagnetic-ferromagnetic transition in a strongly correlated thin film using time resolved X-ray based techniques, and observe unusual dynamic behaviors of the magnetism.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Alexey Neilo, Sergey Bakurskiy, Nikolay Klenov, Igor Soloviev, Mikhail Kupriyanov
Summary: We theoretically studied the transport properties of the SIsN(SO)F structure, which consists of thick and thin superconductor films, an insulator layer, a thin film of normal metal with spin-orbit interaction (SOI), and a monodomain ferromagnetic layer. The interplay between superconductivity, ferromagnetism, and spin-orbit interaction allows for smooth variation of the critical current of this Josephson junction by rotating the magnetization direction in the single F-layer. We investigated the amplitude of the spin valve effect and identified the optimal parameter ranges.
Article
Materials Science, Multidisciplinary
Wenyu Liu, Zuoquan Tan, Gehui Zhang, Meijie Zhu, Hua Xu, Le Wang
Summary: Clear spin accumulation signals were observed in Co/MgO/Graphene/ MgO/Co lateral spin valves after thermal annealing at 270 degrees Celsius, providing a robust way to achieve spin injection in graphene lateral spin valves.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
Junta Igarashi, Wei Zhang, Quentin Remy, Eva Diaz, Jun-Xiao Lin, Julius Hohlfeld, Michel Hehn, Stephane Mangin, Jon Gorchon, Gregory Malinowski
Summary: The authors demonstrate ultrafast magnetization reversal induced by light in rare-earth-free spin valves of [Pt/Co]/Cu/[Co/Pt] within a picosecond. The discovery of spin-transfer torque (STT) allowed the control of magnetization direction in nanoseconds using electrical current. Ultrashort optical pulses have been used to manipulate the magnetization of ferrimagnets in picoseconds by driving the system out of equilibrium. In this study, the authors show ultrafast magnetization reversal induced by light in commonly used [Pt/Co]/Cu/[Co/Pt] spin valves for STT switching, bridging concepts from spintronics and ultrafast magnetism.
Article
Physics, Applied
Chaiyawan Saipaopan, Wachiraporn Choopan, Watchara Liewrian
Summary: The influence of spatial variation of Fermi velocity on the spin-polarized transport properties of massless Dirac fermions in proximity-induced ferromagnetic graphene junction was investigated. It was found that the width of the spin conductance dip near the Dirac point broadens as the Fermi velocity ratio increases, but this does not affect the shifting of the Dirac point. The Fermi velocity ratio can be indirectly measured through spin-dependent conductance, leading to the occurrence of high spin filtering under certain conditions.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Chemistry, Multidisciplinary
Xiangyu Zeng, Ge Ye, Fazhi Yang, Qikai Ye, Liang Zhang, Boyang Ma, Yulu Liu, Mengwei Xie, Yan Liu, Xiaozhi Wang, Yue Hao, Genquan Han
Summary: A unique antisymmetric magnetoresistance behavior has been observed in a lateral vdW structure, and its mechanism has been explored, providing new possibilities for the development of spintronic devices and integrated circuits.
Article
Chemistry, Multidisciplinary
Yifan Zhao, Yujing Du, Lei Wang, Kai Chen, Zhenlin Luo, Wensheng Yan, Qian Li, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: A novel photovoltaic heterojunction structure is proposed for manipulating magnetism under sunlight illumination, expanding the application of non-volatile, low-power spintronic devices.
Article
Physics, Multidisciplinary
Risto Ojajarvi, F. S. Bergeret, M. A. Silaev, Tero T. Heikkila
Summary: This paper investigates the influence of spin supercurrent phenomenon between superconductor and ferromagnet on magnetization dynamics. By observing magnetic hysteresis and ferromagnetic resonance response in experiments, the analog of the current-phase relation is determined and the mechanism of spin supercurrent is explored.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
P. Padmanabhan, F. L. Buessen, R. Tutchton, K. W. C. Kwock, S. Gilinsky, M. C. Lee, M. A. McGuire, S. R. Singamaneni, D. A. Yarotski, A. Paramekanti, J-X Zhu, R. P. Prasankumar
Summary: The authors investigate the coupling between magnetically ordered spins and lattice distortions in CrI3 using ultrafast optical spectroscopy, revealing a coherent spin-coupled phonon mode. This discovery adds to the understanding of van der Waals materials and provides a new platform for exploring the optical control of magnetic and vibrational degrees of freedom at the nanoscale.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Massimiliano d'Aquino, Salvatore Perna, Matteo Pancaldi, Riccardo Hertel, Stefano Bonetti, Claudio Serpico
Summary: In this study, we investigate the possibility of exciting ultrashort spin waves in ferromagnetic thin films using time-harmonic electromagnetic fields with terahertz frequency. We consider the inertial Landau-Lifshitz-Gilbert equation and develop an analytical theory for exchange-dominated inertial spin waves. Numerical micromagnetic simulations are performed to verify the theory and provide insights into realistic ultrafast dynamics experiments.
Article
Physics, Applied
Xiaomin Cui, Shaojie Hu, Takashi Kimura
Summary: By reducing the lateral dimension of the nonmagnetic spin channel, the spin accumulation signal in lateral spin valves can be effectively enhanced. The temperature dependence of the spin accumulation signal and the influence of thermal spin injection under high bias current are also discussed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Seungho Lee, Se Kwon Kim
Summary: In this study, we theoretically investigated the current-induced dynamics of a domain wall in a ferromagnetic nanotube. The domain wall with nontrivial magnetization winding possesses finite orbital angular momentum, which can be changed by the current-induced torque, thereby driving the domain wall. The current-induced torque is interpreted as the transfer of orbital angular momentum from electrons to the domain wall, revealing a previously unrecognized utility of the orbital degree of freedom of magnetic solitons.
Article
Materials Science, Multidisciplinary
Pradeep Raj Sharma, Young Kwang Kim, Tae Wan Kim, Hwayong Noh
Summary: In this study, spin injection and detection were investigated in a lateral spin valve using perpendicularly magnetized electrodes made from an amorphous ferromagnetic multilayer film. The results show that the magnitude of the spin signal switches with the magnetization directions of the injecting and detecting electrodes at different temperatures. Spin relaxation time and diffusion length were extracted from Hanle precession, showing values of 10.2 ps and 311 nm, respectively.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Physics, Condensed Matter
Minoru Yafuso, Keishi Miyazaki, Yusei Takayama, Sora Obinata, Takashi Kimura
Summary: The static and dynamic magnetization properties of a NiFe/Pt/CoFeB tri-layered film were investigated. It was found that the two ferromagnetic layers separated by a Pt spacer exhibit ferromagnetic coupling even at room temperature. In addition, the damping constant of the NiFe layer was observed to significantly increase with a non-linear power dependence. These unique magnetic features in the NiFe layer can be explained by the weak ferromagnetism induced in the Pt spacer.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Review
Physics, Multidisciplinary
Jorge Puebla, Yunyoung Hwang, Kouta Kondou, Yoshichika Otani
Summary: This paper provides an overview of the progress in spin conversion and discusses the additional consequences beyond efficient spin conversion that arise from the formation of quasiparticles at band crossings.
ANNALEN DER PHYSIK
(2022)
Article
Physics, Applied
Riku Iimori, Sora Obinata, Akihiro Mitsuda, Takashi Kimura
Summary: We experimentally investigate the influence of pressure on the spin-charge conversion efficiency in a CoFeB/Pt bilayer system. The results show that the dc voltage spectra systematically increase with increasing pressure, indicating an enhancement of the spin-charge conversion efficiency. This suggests that pressure can be used to modulate the physical constants in spintronic devices.
APPLIED PHYSICS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
T. Iwahori, K. Mizokami, R. Matsuda, K. Ohnishi, T. Kimura
Summary: We have developed a mesoscopic multi-terminal superconducting Nb strip with a spin injection terminal, and investigated the influence of spin polarization on the relaxation process of quasiparticles in the superconducting Nb. The position dependence of the nonlocal voltage provides the quasiparticle relaxation length. It is found that the relaxation length for spin-polarized quasiparticles shows a 12.5% increase compared to unpolarized quasiparticles. This demonstration opens up a new avenue for utilizing spin current in superconducting devices.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
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
Physics, Applied
J. Puebla, Y. Hwang, S. Maekawa, Y. Otani
Summary: Surface acoustic waves (SAWs) are elastic waves propagating on the surface of solids with the amplitude decaying into the solid. SAWs can manipulate the magnetization states by magnetostriction and magnetoelastic effects. This review discusses the characteristics of SAW devices and their interaction with the magnetization in thin films.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Kei Yamamoto, Mingran Xu, Jorge Puebla, Yoshichika Otani, Sadamichi Maekawa
Summary: In this paper, a theoretical description of magnon-phonon interactions in multilayer structures containing a ferromagnetic thin film is presented. The formalism takes into account external magnetic fields in arbitrary directions and various types of acoustic waves, including Rayleigh and Love surface modes. By paying attention to the spatial profile of acoustic wave modes and deriving analytical expressions for effective coupling coefficients, the study successfully reproduces a strongly anisotropic and non-reciprocal linewidth observed in recent experiments of acoustic ferromagnetic resonance.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kouta Kondou, Masanobu Shiga, Shoya Sakamoto, Hiroyuki Inuzuka, Atsuko Nihonyanagi, Fumito Araoka, Masaki Kobayashi, Shinji Miwa, Daigo Miyajima, YoshiChika Otani
Summary: This study investigates chirality-induced current-in-plane magnetoresistance in a chiral molecule/ferromagnetic metal bilayer, and finds that the magnetoresistance is related to thermally driven spontaneous spin polarization in chiral molecules.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Sora Obinata, Riku Iimori, Kohei Ohnishi, Takashi Kimura
Summary: In this study, the contribution of dynamical spin injection in a ferromagnetic resonance is investigated, and the heating effect is pointed out as an important factor. By combining proper spin pumping and heat-flow control, efficient dynamical spin injection can be achieved.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Kun Zhang, Lei Chen, Yue Zhang, Bin Hong, Yu He, Kelian Lin, Zhizhong Zhang, Zhenyi Zheng, Xueqiang Feng, Youguang Zhang, Yoshichika Otani, Weisheng Zhao
Summary: This study demonstrates efficient bulk spin-orbit torque-induced perpendicular magnetization switching under relatively low critical current density in thick Pt/Co multilayers with gradient-induced symmetry breaking. Through tuning the thickness gradient of Pt, the efficiency and chirality of spin-orbit torque can be highly controlled. Atomic intermixing is found to significantly enhance the spin-orbit torque efficiency.
APPLIED PHYSICS REVIEWS
(2022)
Article
Optics
T. P. Lyons, D. J. Gillard, C. Leblanc, J. Puebla, D. D. Solnyshkov, L. Klompmaker, I. A. Akimov, C. Louca, P. Muduli, A. Genco, M. Bayer, Y. Otani, G. Malpuech, A. I. Tartakovskii
Summary: In this study, we investigate the relationship between spin polarization of a 2DEG in a monolayer semiconductor and light-matter interactions modified by an optical microcavity. We observe a pronounced spin-susceptibility of the 2DEG, leading to the observation of a giant effective valley Zeeman splitting for trion-polaritons. We also demonstrate effective optical nonlinearity and all-optical tuning of the polaritonic Zeeman splitting. This study lays the groundwork for engineering topological phases with true unidirectionality in monolayer semiconductors.
Article
Chemistry, Multidisciplinary
Shaojie Hu, Xiaomin Cui, Kang Wang, Satoshi Yakata, Takashi Kimura
Summary: In this study, the resonance property of a magnetic vortex contained within a micron-sized square Py dot was investigated using an amplitude-modulated magnetic field excitation technique. The resonant spectra showed significant modulation as the external magnetic field changed. Micromagnetic simulations confirmed that this behavior was due to the unusual resistance change depending on the vortex core center position. Furthermore, the power dependence of the anti-Lorentzian-like spectra revealed a persistent coexistence of peak and dip.
Article
Quantum Science & Technology
Surya Narayan Panda, Bivas Rana, YoshiChika Otani, Anjan Barman
Summary: This study investigates magnetization dynamics in different NM/Co20Fe60B20 heterostructures using femtosecond pulsed laser-induced time-resolved magneto-optical Kerr effect magnetometry. It is found that the SOC strength of the underlayer has a systematic influence on ultrafast demagnetization time, fast remagnetization time, and the Gilbert damping parameter. The spin pumping formalism estimates that higher SOC strength results in more efficient transport of spin current.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Physics, Multidisciplinary
Angshuman Deka, Bivas Rana, Ryo Anami, Katsuya Miura, Hiromasa Takahashi, YoshiChika Otani, Yasuhiro Fukuma
Summary: This study investigates the application of electric field controlled magnetization dynamics in low-power spintronic devices. Electric field induced parametric excitation was successfully achieved by using interfacial in-plane magnetic anisotropy. The excitation wavelength can be tuned by changing the input power and frequency of the applied voltage. A phenomenological model was developed to explain the role of electric field torque. This research offers an opportunity for developing nanoscale magnonic devices and exploring nonlinear dynamics in nanomagnetic systems.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Liyang Liao, Fenghua Xue, Lei Han, Junyeon Kim, Ruiqi Zhang, Lun Li, Jiuming Liu, Xufeng Kou, Cheng Song, Feng Pan, YoshiChika Otani
Summary: A strong torque effect was observed in CoFeB/Ru/Al2O3 polycrystalline stacks, where the unfilled d-shell and small spin-orbit coupling in Ru provide an ideal platform for orbital generation and transport. Orbit transport in polycrystalline materials exhibits a unique random precession behavior, which leads to higher efficiency compared to single crystals.
