Article
Chemistry, Multidisciplinary
Fabian Kammerbauer, Won-Young Choi, Frank Freimuth, Kyujoon Lee, Robert Froemter, Dong-Soo Han, Reinoud Lavrijsen, Henk J. M. Swagten, Yuriy Mokrousov, Mathias Klaeui
Summary: The recently discovered interlayer Dzyaloshinskii-Moriya interaction (IL-DMI) in multilayers with perpendicular magnetic anisotropy can stabilize intriguing spin textures such as Hopfions. To control the IL-DMI, the influence of an electric current on a synthetic antiferromagnet with growth-induced IL-DMI was investigated. The study revealed that the azimuthal dependence of IL-DMI shifts with increasing current, suggesting the presence of an additional current-induced term that linearly increases the IL-DMI in the direction of current flow, opening the possibility of easily manipulating 3D spin textures by currents.
Article
Chemistry, Multidisciplinary
Qiyao Liu, Taeheon Kim, Kyusup Lee, Dongsheng Yang, Dushyant Kumar, Fanrui Hu, Hyunsoo Yang
Summary: The high-frequency optical mode of α-Fe2O3 is studied, and it is found that Dzyaloshinskii-Moriya (DM) interaction generates a new type of torque on the magnetic resonance. The optical mode spectra is measured using a continuous-wave terahertz interferometer, and an asymmetric absorption with a large amplitude and broad linewidth is observed near the magnetic transition point, Morin temperature (T-M ≈ 254.3 K). Based on the spin wave model, the spectral anomaly is attributed to the DM interaction-induced torque, allowing for the extraction of a DM interaction field strength of 4 T. This work opens up a new avenue for characterizing spin resonance behaviors at antiferromagnetic singular points for next-generation and high-frequency spin-based information technologies.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sukanta Kumar Jena, Rajibul Islam, Ewelina Milinska, Marcin M. Jakubowski, Roman Minikayev, Sabina Lewinska, Artem Lynnyk, Aleksiej Pietruczik, Pawel Aleszkiewicz, Carmine Autieri, Andrzej Wawro
Summary: In this study, the relationship between magnetization reversal, magnetic domain alignment, and strength of DMI with the crystalline structure of W/Co/Pt multilayers grown by molecular beam epitaxy was investigated. The high value of DMI strength was determined from the aligned magnetic domain stripe structure, which greatly exceeded 2 mJ m(-2), and originated from the additive contributions of the interfacial atomic Co layers at the two types of interfaces. The experimental results were in good agreement with micromagnetic modelling and density functional theory calculations, confirming the significant role of the interfacial atomic Co layers in enhancing DMI strength.
Article
Chemistry, Inorganic & Nuclear
Shivani Sharma, Pavitra N. Shanbhag, Fabio Orlandi, Pascal Manuel, Sean Langridge, Devashibhai Adroja, Milan K. Sanyal, Athinarayanan Sundaresan
Summary: The study revealed the coexistence of C-type and G-type antiferromagnetic ordering in polycrystalline YVO3 at 115K, with the G-type phase growing at the expense of the C-type phase on cooling until it ceases at around 77K. Symmetry analysis showed different origins for the Dzyaloshinskii-Moriya interaction in each phase, possibly explaining the observed magnetization reversal between TN and TS. Additionally, the discussion suggested that magnetic phase separation and weak ferromagnetism may be common mechanisms underlying the magnetization reversal phenomenon in other RVO3 systems.
INORGANIC CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Zhongyi Zhang, Shengshan Qin, Jiadong Zang, Chen Fang, Jiangping Hu, Fu-Chun Zhang
Summary: The presence of Dzyaloshinskii-Moriya (DM) interaction in limited noncentrosymmetric materials leads to unique spin textures and exotic chiral physics. The emergence of DM interaction in centrosymmetric crystals has the potential to greatly enhance material realization. In this study, we demonstrate that an itinerant centrosymmetric crystal respecting a nonsymmorphic space group can serve as a new platform for the DM interaction. Our findings reveal the role of nonsymmorphic symmetries in influencing magnetism and suggest that nonsymmorphic crystals can be promising platforms for designing magnetic interactions.
Article
Materials Science, Multidisciplinary
I. V. Solovyev
Summary: We investigate the abilities of various linear response based techniques for extracting parameters of antisymmetric Dzyaloshinskii-Moriya (DM) interactions from first-principles electronic structure calculations. In our analysis, we discuss the magnetic force theorem (MFT) and the exact approach formulated in terms of the inverse response. We also propose a downfolding procedure for transferring the effect of ligand spins into parameters of effective interactions between localized spins.
Article
Chemistry, Multidisciplinary
W. Zhang, R. Chen, B. Jiang, X. Zhao, W. Zhao, S. S. Yan, G. Han, S. Yu, G. Liu, S. Kang
Summary: In this study, the interfacial Dzyaloshinskii-Moriya interaction (i-DMI) was utilized to enhance the overall i-DMI in symmetrical Au/[Fe/Au](n) structures. By controlling the chirality at the Au/Fe interface and changing the stacking number, the tunability of i-DMI was demonstrated. The chirality change was attributed to a large tensile stress at the bottom of Fe due to lattice mismatch, leading to a reversal of the i-DMI chirality from left-handed to right-handed in a multilayer system.
Article
Chemistry, Multidisciplinary
Jijun Yun, Baoshan Cui, Qirui Cui, Xiaodong He, Yuhan Chang, YingMei Zhu, Ze Yan, Xi Guo, Hongfei Xie, Jianrong Zhang, Qiaoning Bai, Yongbo Zhai, Hengyi Xu, Yalu Zuo, Dezheng Yang, Chenglong Jia, Guoqiang Yu, Hao Wu, Hongxin Yang, Desheng Xue, Li Xi
Summary: The interlayer Dzyaloshinskii-Moriya interaction (DMI) in synthetic ferromagnetic/antiferromagnetic Pt/Co/Pt/Ru/Pt/Co/Ta structures shows uniaxial anisotropic characteristics and can be tuned by the thickness of the Ru layer, which is beneficial for designing future spintronic devices with 3D spin textures.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Sergey Erokhin, Dmitry Berkov, Andreas Michels
Summary: Motivated by recent experimental results, a numerical study was conducted to investigate the interfacial Dzyaloshinskii-Moriya interaction (DMI) in nanocrystalline terbium. It was found that the DMI-induced spin misalignment between adjacent nanograins is responsible for the observed asymmetric positive-negative pattern in polarized neutron scattering experiments. The analysis of the remagnetization process suggests the general impact of DMI on the macroscopic magnetic parameters of defect-rich polycrystalline materials.
NEW JOURNAL OF PHYSICS
(2023)
Review
Chemistry, Physical
Robert E. Camley, Karen L. Livesey
Summary: This article reviews the recent research on the Dzyaloshinskii-Moriya interaction (DMI) in magnetic and multiferroic materials, covering topics such as new magnetic structures, changes in domain wall structures, and the influence of DMI on spin wave behavior. It also briefly discusses multiferroic materials and new two-dimensional materials with DMI.
SURFACE SCIENCE REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Fengjun Zhuo, Hang Li, Zhenxiang Cheng, Aurelien Manchon
Summary: A magnonic metamaterial with spatially modulated Dzyaloshinskii-Moriya interaction is proposed and demonstrated through micromagnetic simulations. The magnonic Snell's law is established to describe the behavior of spin waves passing through an interface between two media with different dispersion relations due to different Dzyaloshinskii-Moriya interactions. Based on this law, total internal reflection of spin waves is observed, with the critical angle depending on the sign and strength of Dzyaloshinskii-Moriya interaction. Furthermore, spin-wave beam fiber and spin-wave lens are designed using the artificial magnonic metamaterials. These findings open up new possibilities for spin wave manipulation in magnonics.
Article
Chemistry, Multidisciplinary
Shixuan Liang, Ruyi Chen, Qirui Cui, Yongjian Zhou, Feng Pan, Hongxin Yang, Cheng Song
Summary: Conduction electron spins interacting with magnetic impurity spins can mediate the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, opening up significant technological developments in magnetic storage and spintronics. While symmetric coupling of magnetism has been found with the RKKY-type interlayer interaction, the asymmetric counterpart has not been explored. This study reports an unprecedented RKKY-type interlayer Dzyaloshinskii-Moriya (DMI) interaction in synthetic magnets, exhibiting a damped oscillatory feature. The asymmetric interlayer interaction is found to be highly dependent on the intermediate coupling layer.
Article
Chemistry, Multidisciplinary
Chenglong Hu, Xiaochen Shen, Lan Bo, Rongzhi Zhao, Dapeng Zhu, Lianze Ji, Guohua Bai, Xuefeng Zhang
Summary: This study reports a DMI-like behavior in permalloy through the study of coupled vortices in confined structures. The observed asymmetric phenomenon mainly arises from a DMI-like behavior, which is associated with the increased total energy difference between different ground-state coupled vortices. Additionally, the junction between disks accelerates the annihilation of vortices moving toward it and is also the starting point of vortex nucleation.
Article
Physics, Applied
B. Ravi Kumar, Sreekar Guddeti, P. S. Anil Kumar
Summary: The magnetic field driven domain-wall motion in out-of-plane magnetized Ta/Pt/CoFeB/Pt multilayers, both as-deposited and annealed, was investigated using Kerr microscopy. The study focused on the modified interfacial Dzyaloshinskii-Moriya interaction (iDMI) that controls the dynamics of chiral domain walls. The strength of iDMI was found to decrease with increasing CoFeB thickness and annealing temperature, which can be attributed to changes in the interface properties and annealing-induced effects.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Yabing Zhang, Xiangjie Kong, Guofu Xu, Ying Jin, Changjun Jiang, Guozhi Chai
Summary: In this work, we studied the temperature dependence of the Dzyaloshinskii-Moriya interaction (DMI) in Co/Pt thin film by analyzing the asymmetric spin-wave dispersion. The results showed that the DMI constant decreased monotonically with increasing temperature, and there was a proportional relationship between DMI and the saturation magnetization and uniaxial anisotropy. These findings suggest that temperature can be used as a possible way to control DMI, and the temperature dependence of DMI in thin films has significant implications for potential applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Hiroaki Niwa, Naotaka Yoshikawa, Masashi Kawaguchi, Masamitsu Hayashi, Ryo Shimano
Summary: This study introduces a method of generating two fundamental terahertz cylindrical vector beams (THz-CVBs) using a spintronic THz emitter, demonstrating the production of azimuthally- and radially-polarized THz pulses. By employing mode conversion with a triangular Si prism, both experimental and numerical results confirm the generation of these THz vector beams, opening up possibilities for sophisticated polarization control in the terahertz regime.
Correction
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: The magnetic properties of rare earth-transition metal ferrimagnetic thin films are studied. It is found that the compensation of magnetic moments of rare earth and transition metal sublattices increases with decreasing film thickness. For thin TbFeCo films, Tb atoms do not contribute to the magnetization. The perpendicular magnetic anisotropy increases with a thin Co layer but drops to zero with a thin Tb layer. The Tb concentration at which magnetic compensation occurs decreases when the underlayer is changed from Pt to Ta.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Hiroki Matsumoto, Takuya Kawada, Mio Ishibashi, Masashi Kawaguchi, Masamitsu Hayashi
Summary: In this study, the transmission of surface acoustic waves (SAWs) in ferromagnetic/non-magnetic/ferromagnetic trilayers was investigated. It was found that the SAW transmission amplitude depends on its propagation direction when the two ferromagnetic layers are coupled antiferromagnetically. The degree of SAW nonreciprocity increases with increasing exchange coupling strength and reaches 37 dB mm(-1) for a device with the thinnest spacer layer. These findings demonstrate the potential of interlayer exchange coupled synthetic antiferromagnets for acoustic nonreciprocal transmission devices.
APPLIED PHYSICS EXPRESS
(2022)
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: We conducted a systematic study on the current-induced motion of domain walls in TbFeCo ferrimagnetic thin films with a Pt underlayer. By varying the Tb concentration, we investigated the effect of magnetization compensation on the domain wall motion. We observed that the direction of domain wall movement changes at the magnetization compensation point, with FeCo-rich films moving against the current flow. When the film composition is slightly Tb-rich, the domain wall initially moves along the current but reverses its direction with increased current. These findings suggest the presence of competing torques in Tb-based ferrimagnets, resulting in slower domain wall velocity compared to Gd-based ferrimagnets.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Yuto Shoka, Genki Okano, Hiroyuki Suto, Satoshi Sumi, Hiroyuki Awano, Kenji Tanabe
Summary: We have discovered a new phenomenon called the anisotropic magneto-inductance (AML) effect, where inductance oscillates in permalloy films as a function of the angle between an in-plane magnetic field and an electric current direction. We have investigated the dependence of the AML effect on size and voltage, and found that it should be evaluated in terms of inductivity based on length, frequency, and amplitude dependences. Inductors utilizing this AML effect have potential to be variable, on-chip, and significantly smaller than small commercial inductors.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Applied
Isamu Yasuda, Takuya Kawada, Hiroki Matsumoto, Masashi Kawaguchi, Masamitsu Hayashi
Summary: We investigated helicity-resolved Raman scattering in PtSe2 flakes of varying thicknesses. The peak amplitude of helicity-switched Raman scattering is significantly larger than that of helicity-conserved scattering for the in-plane E (g) mode, in agreement with Raman tensor analyses and the conservation law of angular momentum. The peak amplitude of the helicity-switched E (g) mode is greater for thinner flakes. Additionally, we observed Raman peaks near the energy levels of IR-active E (u) and A (2u) modes, but only in monolayer and a few-layers-thick flakes. Interestingly, these peaks are only present in helicity-switched Raman scattering and are nearly absent in helicity-conserved scattering.
APPLIED PHYSICS EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Takahiro Ishikawa, Ryosuke Akashi, Kotaro Kubo, Yuta Toga, Koji Inukai, Itti Rittaporn, Masamitsu Hayashi, Shinji Tsuneyuki
Summary: In this paper, we used an evolutionary algorithm and first-principles calculations to explore metastable phases in bulk tungsten with large intrinsic spin Hall conductivity (SHC). We identified the Fddd and Cmcm structures as having larger SHC than the stable alpha-W and metastable beta-W phases. Although the energy of Fddd and Cmcm structures is higher than that of alpha-W, their SHC values at the Fermi level are almost twice as large as alpha-W and exceed the SHC of beta-W.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Guanxiong Qu, Masamitsu Hayashi, Masao Ogata, Junji Fujimoto
Summary: We studied the intrinsic spin Hall effect of a Dirac Hamiltonian system with ferromagnetic exchange coupling. The introduction of a Stoner-type ferromagnetic ordering breaks the spherical symmetry of the pristine Dirac model, leading to anisotropy in the spin Hall conductivity along the direction of the external electric field. Interestingly, this anisotropy persists even in the limit of zero magnetization.
Article
Materials Science, Multidisciplinary
Tomohiro Taniguchi, Shinji Isogami, Yohei Shiokawa, Yugo Ishitani, Eiji Komura, Tomoyuki Sasaki, Seiji Mitani, Masamitsu Hayashi
Summary: We study magnetization switching in the dynamical regime for in-plane magnetized systems and develop a formula for the switching probability. The formula agrees well with numerical simulations and experiments. We find that the transition width of the switching probability increases with decreasing pulse width and the shape of the probability density changes with varying pulse width.
Article
Materials Science, Multidisciplinary
Zhendong Chi, Guanxiong Qu, Yong-Chang Lau, Masashi Kawaguchi, Junji Fujimoto, Koki Takanashi, Masao Ogata, Masamitsu Hayashi
Summary: The spin Hall effect of a Dirac Hamiltonian system is studied using semiclassical analyses and the Kubo formula. It is found that the spin Hall conductivity is dependent on the definition of spin current, and when defined as the flow of spin magnetic moment, it has non-zero off-diagonal components. The analytical formula derived in this study is able to quantitatively explain the experimental results, indicating that the giant spin magnetic moment with an effective g factor approaching 100 is responsible for the spin Hall effect in Bi.