Article
Physics, Multidisciplinary
Yu-Shan Lu, Jian-Lin Li, Chien-Te Wu
Summary: The study examines the topological phase transitions in magnonic systems in honeycomb ferromagnets, where the magnon-magnon interactions cause the magnonic energy gap to close and reopen at a critical temperature. The Chern numbers of the magnonic bands are distinct above and below the critical temperature, serving as a signature for the topological phase transitions. Additionally, the thermal Hall conductivity in the magnonic system exhibits a sign reversal at the critical temperature, which can be experimentally observed and validated in materials like CrI3.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Dingwen Qian, Monica Olvera de la Cruz
Summary: In this study, we investigate oppositely charged colloids with size and charge asymmetry under the influence of an external electric field. The large colloidal particles are connected by harmonic springs, arranging themselves into a hexagonal lattice, while the small particles demonstrate fluid-like motion without bonds. Our findings reveal that the system exhibits cluster formation with stable wave packets in the vibrations of the large particles when the external driving force exceeds a critical value.
Article
Physics, Condensed Matter
Zulfidin Khodzhaev, Emrah Turgut
Summary: Resonant spin dynamics of three-dimensional topological spin textures, namely Neel and Bloch hopfions, were investigated using micromagnetic simulations. The ground state spin configuration, effects of anisotropies, geometric confinements, and demagnetizing fields were identified for both hopfions. Hopf numbers and resonance frequencies were calculated to confirm the topological nature and guide experimental studies in identifying the three-dimensional topological spin texture of hopfions in functioning chiral magnets.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Qi-Hui Chen, Fei-Jie Huang, Yong-Ping Fu
Summary: We investigate the magnon excitations and their interactions in honeycomb antiferromagnets with the Dzyaloshinskii-Moriya interaction. The classical ground state of the system is noncollinear antiferromagnetic order under an applied magnetic field, so considering the interactions between magnons is crucial. We find an exact solution of the bosonic Bogoliubov-de Gennes Hamiltonian and analytically study the topological properties and damping effects of the magnon bands.
Article
Materials Science, Multidisciplinary
Vishal Kumar, Gaurav K. K. Shukla, Nisha Shahi, Sanjay Singh
Summary: Topologically protected nontrivial spin structures have attracted significant interest in the field of condensed matter physics due to their potential applications in low-power-consumption spintronics devices and memory devices. The topological Hall effect (THE) is an extra Hall resistivity that arises from real-space Berry curvature in materials with nontrivial spin texture. In this study, THE in the (Mn1-xFex)(3.25)Ge (x = 0.4) alloy was investigated using magneto-transport measurements. The results showed that the maximum THE in the system was about 0.65 μΩcm at 150 K, in contrast to the zero THE in the pristine Mn3Ge. The strong temperature dependence of THE indicated that the noncoplanar spin structure, resulting from the competition among magneto-crystalline anisotropy, antiferromagnetic coupling, and ferromagnetic exchange interaction, was the main source of THE in the present system. Moreover, chemical doping was shown to be an effective approach to induce THE in materials with zero THE in their parent phase.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Rui Wu, Di Zhang, Tuhin Maity, Ping Lu, Jie Yang, Xingyao Gao, Shishun Zhao, Xiucheng Wei, Hao Zeng, Ahmed Kursumovic, Guang Tian, Weiwei Li, Chao Yun, Yongqiang Wang, Zengyao Ren, Ziyao Zhou, Ming Liu, Kelvin H. L. Zhang, Quanxi Jia, Jinbo Yang, Haiyan Wang, Judith L. MacManus-Driscoll
Summary: Adding antiferromagnet to a 3-1-type multiferroic nanocomposite can result in a large, self-biased magnetoelectric effect at room temperature.
NATURE ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
John A. Schneeloch, Yu Tao, Yongqiang Cheng, Luke Daemen, Guangyong Xu, Qiang Zhang, Despina Louca
Summary: Gapless Dirac magnons are present in bulk CrCl3, with inelastic neutron scattering intensity approaching zero at low temperatures. Upon warming, magnon-magnon interactions induce strong renormalization and decreased lifetimes.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Characterization & Testing
Rajat K. Roy, Premkumar Murugaiyan, Rajinikanth Veerappan, S. P. S. Pundir, Subrata Sarkar, Ashis K. Panda, Amitava Mitra
Summary: This research investigated the quality assessment of cold rolled grain oriented (CRGO) steels by evaluating the microstructure, texture, and magnetic properties. The findings revealed that the service exposed CRGO sheets exhibited oxidation, precipitation, and widening at the grain boundary, indicating structural deterioration. Furthermore, their misorientation of Goss grains was greater compared to the virgin CRGO, and they displayed poor magnetic properties with high core loss. The non-destructive evaluation explained the deterioration of magnetic anisotropy in the service exposed CRGO sheets, which could be beneficial for the rapid inspection of CRGO quality. Overall, this research provides a baseline for transformer manufacturers to identify inferior quality CRGO sheets among good ones.
JOURNAL OF NONDESTRUCTIVE EVALUATION
(2022)
Article
Materials Science, Multidisciplinary
Mohsen Aghadavoudi Jolfaei, Jun Liu, Lei Frank Zhou, Frenk Van Den Berg, Claire Davis
Summary: Interstitial free (IF) steels, a type of deep drawing steel, are widely used in the automotive industry due to their excellent formability, strength, and surface quality. The formability of IF steels is achieved by a specific crystallographic texture, and a non-destructive magnetic anisotropy measurement technique is proposed in this study to evaluate the texture on production material. The findings indicate that the proposed U-shaped electromagnetic (EM) sensor shows promise for rapid assessment of the magnetic anisotropy in IF steels.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Review
Mathematics, Applied
Gabriel D. Chaves-O'Flynn, D. L. Stein
Summary: In this paper, the authors review the challenges associated with thermal activation in nanoscopic magnetic systems and discuss transitions between different magnetic structures. The findings have important implications for understanding the behavior of thermal activation in nanoscale magnetic systems.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Physics, Multidisciplinary
Carmen Rubio-Verdu, Javier Zaldivar, Rok Zitko, Jose Ignacio Pascual
Summary: This letter reports on the generation of coupled YSR states through intramolecular exchange interactions on a molecular platform. Evidence of two distinct interaction channels and the inversion of particle-hole asymmetry across the molecule were found. Numerical calculations show that this asymmetry pattern is caused by two spin-hosting orbitals with opposite potential scattering and strong coupling.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Daniel G. Mazzone, Derek Meyers, Yue Cao, James G. Vale, Cameron D. Dashwood, Youguo Shi, Andrew J. A. James, Neil J. Robinson, Jiaqi Lin, Vivek Thampy, Yoshikazu Tanaka, Allan S. Johnson, Hu Miao, Ruitang Wang, Tadesse A. Assefa, Jungho Kim, Diego Casa, Roman Mankowsky, Diling Zhu, Roberto Alonso-Mori, Sanghoon Song, Hasan Yavas, Tetsuo Katayama, Makina Yabashi, Yuya Kubota, Shigeki Owada, Jian Liu, Junji Yang, Robert M. Konik, Ian K. Robinson, John P. Hill, Desmond F. McMorrow, Michael Forst, Simon Wall, Xuerong Liu, Mark P. M. Dean
Summary: Using ultrafast resonant inelastic X-ray scattering, we have shown that femtosecond laser pulses can excite transient magnons at large wavevectors in gapped antiferromagnets, persisting for several picoseconds. Our work suggests that materials with isotropic magnetic interactions are preferred for achieving rapid manipulation of magnetism.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Optics
S. S. Seidov, M. Fistul
Summary: This theoretical study examines the coherent quantum dynamics of a single magnetic fluxon trapped in Josephson-junction parallel arrays with large kinetic inductances. The dynamics of the magnetic fluxon are analyzed in detail, including energy bands, quantum tunneling, and oscillations controlled by external factors like voltage and bias current. The study shows how these quantum effects manifest in the current-voltage characteristics of the arrays.
Article
Chemistry, Physical
Zhi-Hong Li, Guo-Dong Wang, Hai-Tao Liu
Summary: Fabricating ultrathin non-oriented electrical steels (NOES) sheets has been a challenge due to undesired texture caused by severe plastic deformation. In this study, a one-stage rolling route and a two-stage rolling route were used to prepare 0.10 mm-thick 3.1Si-0.8Al NOES. The severe plastic deformation in the one-stage route split the orientations of alpha grains and caused lattice curvature, leading to the formation of undesirable textures. In comparison, the two-stage route favored the development of shear bands and increased the final grain size, resulting in improved magnetic induction and decreased core loss.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Junqiang Cong, Feihu Guo, Jialong Qiao, Shengtao Qiu, Haijun Wang
Summary: This study investigated the effects of grain size and crystallographic texture on the magnetic properties of Fe-0.65%Si non-oriented electrical steel produced by the CSP process. The results showed that grain size had a significant impact on core loss, while crystallographic texture primarily influenced magnetic flux density.
Article
Engineering, Electrical & Electronic
I. G. Bostrem, Vl E. Sinitsyn, M. Mokronosov, A. S. Ovchinnikov, J. Kishine, E. G. Ekomasov, M. Fakhretdinov
Summary: This study demonstrates the existence of magnetic discrete breathers in a monoaxial chiral helimagnet and describes the numerical algorithm used to search for them. The conditions for the occurrence of these modes are identified, and their stability is examined through Floquet analysis.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Physics, Multidisciplinary
Y. Shimamoto, Y. Matsushima, T. Hasegawa, Y. Kousaka, I Proskurin, J. Kishine, A. S. Ovchinnikov, F. J. T. Goncalves, Y. Togawa
Summary: Chiral spin soliton lattices (CSL), which exhibit reconfigurability and controllability, can generate phononlike elementary excitations. In this study, higher-order magnetic resonance modes were observed in the CSL phase of a chiral helimagnet through experiments. The resonance frequency of the CSL phonon can be adjusted, making chiral helimagnets potentially useful for broadband signal processing in the millimeter-wave band.
PHYSICAL REVIEW LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Jun-ichiro Kishine, Hiroaki Kusunose, Hiroshi M. Yamamoto
Summary: This article discusses the order parameter for molecular and crystal chirality and the various effects associated with it, such as spin selectivity and chiral resolution.
ISRAEL JOURNAL OF CHEMISTRY
(2022)
Article
Physics, Multidisciplinary
Kyosuke Ishito, Huiling Mao, Yusuke Kousaka, Yoshihiko Togawa, Satoshi Iwasaki, Tiantian Zhang, Shuichi Murakami, Jun-ichiro Kishine, Takuya Satoh
Summary: In this study, truly chiral phonons were identified in bulk crystals using circularly polarized Raman spectroscopy and first-principles calculations. The findings have significant implications for the development of opto-phononic-spintronic devices, enabling the transfer of pseudo-angular momentum from photons to electron spins through propagating chiral phonons.
Article
Physics, Applied
M. Ohkuma, M. Mito, Y. Kousaka, J. Ohe, J. Akimitsu, J. Kishine, K. Inoue
Summary: MnNb3S6 is a monoaxial chiral magnet that can stabilize magnetic solitons under a magnetic field. The number of solitons can be controlled by adjusting the magnetic field. Additionally, MnNb3S6 exhibits magnetization relaxation due to soliton annihilation and shows both equilibrium and nonequilibrium chiral soliton lattice states through soliton locking phenomena. This study also found that the soliton number remains constant in the soliton locking region, resulting in no magnetization relaxation.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Medicinal
Kyosuke Ishito, Huiling Mao, Kaya Kobayashi, Yusuke Kousaka, Yoshihiko Togawa, Hiroaki Kusunose, Jun-ichiro Kishine, Takuya Satoh
Summary: Recently, the study of chiral phonons, which possess angular and pseudoangular momenta, has gained significant attention. The detection of peak splitting in circularly polarized Raman spectroscopy provides evidence for the presence of chiral phonons in chiral crystals. This study presents observation of chiral phonons in a unary crystal, Te, and confirms the conservation law of pseudoangular momentum in Raman scattering, which determines the handedness of chiral crystals. The true chirality of the phonons is evaluated using a measure similar to an electric toroidal monopole.
Article
Chemistry, Inorganic & Nuclear
A. A. Bykov, N. M. Chubova, E. V. Altinbaev, Yu Kousaka, A. S. Ovchinnikov, J. Kishine, S. V. Grigoriev
Summary: The magnetic structure of Cr1/3NbS2 compound was studied using small-angle neutron scattering. At zero magnetic field, the compound forms a helical structure with magnetic moments of Cr3+ ions. The magnetic field leads to the formation of a chiral soliton lattice with different behaviors depending on the orientation of the helix wave vector. Strong ferromagnetic fluctuations are observed during the transition from the chiral soliton lattice to the field-induced ferromagnetic state.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
I. G. Bostrem, A. S. Ovchinnikov, E. G. Ekomasov, Vl. E. Sinitsyn, A. E. Fedorov, A. A. Voronina
Summary: In this study, we extend the theory of breather solutions from the anticontinuous limit to discrete spin systems. We formulate necessary conditions and determine the upper bound of the intersite coupling constant for the extension procedure. Using a numerical algorithm, we obtain breather modes of a discrete spin chain associated with single-site and two-site excitations of the anticontinuous limit and demonstrate their linear stability.
THEORETICAL AND MATHEMATICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Yoshihiko Togawa, Alexander S. Ovchinnikov, Jun-ichiro Kishine
Summary: This paper reviews recent advances in the study of magnetic, electronic, spintronic, and phononic properties of chiral crystals, focusing on the connection between the Dzyaloshinskii-Moriya interaction (DMI) and chirality. In chiral crystals, the microscopic DMI is elevated to a macroscopic Lifshitz invariant (LI), breaking mirror reflection and inversion symmetry globally. As a result, chiral crystals exhibit nontrivial physical responses at a macroscopic scale. Specifically, chiral magnetism gives rise to a chiral spin soliton lattice (CSL) in monoaxial chiral magnetic crystals, characterized by coherent and topological properties. The emergence of a giant spin polarization is observed in a wide range of chiral materials, from organic molecules to inorganic crystals. Additionally, a first-order spatial dispersion, similar to the LI, is also observed in elastic or phonon degrees of freedom in chiral crystals. These examples demonstrate the realization of a time-even pseudoscalar term, representing a generalized concept of the DMI and LI, in chiral media.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Materials Science, Multidisciplinary
Masaki Mito, Takayuki Tajiri, Yusuke Kousaka, Jun Akimitsu, Jun-ichiro Kishine, Katsuya Inoue
Summary: This study investigates the effects of magnetic structure and temperature on the magnetostriction of CrNb3S6 using powder x-ray diffraction analysis. It is found that the magnetostriction below the magnetic ordering temperature depends on the lattice constants. The observed effect is explained in terms of the hybridization between Nb(4 f)'s z2 orbital and Cr's a1 orbital, as well as the structural symmetry of the CrS6 octahedron.
Article
Materials Science, Multidisciplinary
A. A. Tereshchenko, A. S. Ovchinnikov, D. I. Gorbunov, D. S. Neznakhin
Summary: This study discusses the possibility of experimentally observing ultrasonic attenuation in the ferromagnet LuCo3 near the low-spin-high-spin crossover. The researchers show that ultrasound propagation in the material leads to transitions between magnon band states through the absorption of phonons, and this process is highly sensitive to the magnetization value. The presence of a high magnetic field alters the ultrasound propagation regime from off-resonant to resonant, and the researchers propose a criterion for this change. Calculations demonstrate anomalies in the temperature and field dependence of ultrasonic wave number and attenuation near the crossover point at intermediate temperatures far below the Curie temperature.
Article
Materials Science, Multidisciplinary
A. S. Ovchinnikov, J. G. Ruziev, N. M. Nosova, E. M. Sherokalova, N. V. Selezneva, N. V. Baranov
Summary: Magnetic susceptibility data suggests the presence of short-range magnetic correlations in a wide temperature range above the magnetic critical temperatures of CrxNbSe2 and FexTiS2. These compounds are considered appropriate systems for the appearance of the Griffiths phase. The consistency of magnetization behavior with the scaling law proposed by Chan et al. was used to identify Griffiths behavior, and it was found that CrxNbSe2 compounds with x = 0.33 and x = 0.45 and Fe0.25TiS2 compound exhibit the Griffiths phase above magnetic ordering temperatures.
Article
Materials Science, Multidisciplinary
Akihito Kato, Hiroshi M. Yamamoto, Jun-ichiro Kishine
Summary: This paper presents a theoretical study of chirality-induced spin selectivity (CISS) using a model chiral molecule belonging to the C-3 point group. By considering molecular symmetry, time-reversal symmetry, and classifying molecular ground states, the paper shows that chirality can act as an efficient spin filter. Additionally, the role of nuclear vibrations in mediating coupling and enhancing spin-filtering efficiency is discovered.
Article
Materials Science, Multidisciplinary
Masaki Mito, Takayuki Tajiri, Yusuke Kousaka, Yoshihiko Togawa, Jun Akimitsu, Jun-ichiro Kishine, Katsuya Inoue
Summary: We report on the magnetostriction effects in the paramagnetic state of the chiral magnet CrNb3S6, showing that these effects are influenced by the strength and direction of the magnetic field. The study reveals the sensitivity of the symmetry of the CrS6 octahedron to the magnetic field even at room temperature.
