Article
Engineering, Electrical & Electronic
Youhua Feng, Xi Zhang, Guoping Zhao, Gang Xiang
Summary: This study demonstrates that the skyrmion Hall effect can be utilized to design a useful skyrmion diode, providing a promising pathway for the development of spintronic devices based on unidirectional skyrmion transport.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Multidisciplinary Sciences
R. Brearton, L. A. Turnbull, J. A. T. Verezhak, G. Balakrishnan, P. D. Hatton, G. van der Laan, T. Hesjedal
Summary: Magnetic skyrmions are topologically non-trivial magnetic moments that form lattices in helimagnetic materials, showing promise as efficient information carriers. The skyrmion Hall angle, which measures the deviation of skyrmion motion from the driving force, can be determined using reciprocal space techniques. Skyrmions experience deflection under a shear drive, leading to an additional sideways motion known as the skyrmion hall effect.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Boerge Goebel, Ingrid Mertig
Summary: Recent research has shown that the skyrmion Hall effect can be favorable for spintronic applications, allowing the translation of alternating current into directed motion along a specific track, similar to a ratchet mechanism. The motion of skyrmions exhibits fundamental differences compared to topologically trivial magnetic objects and classical particles driven by periodic forces, with the racetrack geometry affecting the strictness of the ratchet mechanism.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Anthony K. C. Tan, Pin Ho, James Lourembam, Lisen Huang, Hang Khume Tan, Cynthia J. O. Reichhardt, Charles Reichhardt, Anjan Soumyanarayanan
Summary: Researchers have found that skyrmions in dense arrays in Pt/Co/MgO wires exhibit robust dynamic characteristics, with high speeds and sensitivity of SkHE to skyrmion size, but influenced by other factors. This establishes a solid framework for manipulating SkHE to achieve high-throughput skyrmion motion.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Andrei Zadorozhnyi, Yuri Dahnovsky
Summary: In this study, we investigate the topological Hall effect in centrosymmetric skyrmions systems using the Boltzmann equation for a nonequilibrium distribution function. We find that the topological Hall resistivity exhibits nonlinear behavior depending on the chemical potential. Additionally, we propose an experimental setup and provide equations to determine pxy.
Article
Materials Science, Multidisciplinary
N. Swain, M. Shahzad, G. Paradezhenko, A. A. Pervishko, D. Yudin, P. Sengupta
Summary: The Shastry-Sutherland model and its generalizations have been shown to capture emergent complex magnetic properties from geometric frustration in several quasi-two-dimensional quantum magnets, and metallic Shastry-Sutherland magnets can exhibit a topological Hall effect driven by magnetic skyrmions under realistic conditions. The magnetic properties are modeled with competing symmetric Heisenberg and asymmetric Dzyaloshinskii-Moriya exchange interactions, and a coupling between the spins of the itinerant electrons and the localized moments describes the magnetotransport behavior, with evidence for field-driven skyrmion crystal formation provided by complementary Monte Carlo simulations and a novel machine learning analysis.
Article
Physics, Applied
Robin Msiska, Davi R. Rodrigues, Jonathan Leliaert, Karin Everschor-Sitte
Summary: Contrary to previous belief, this study shows that the skyrmion Hall effect does not vanish for spin-orbit-torque-driven objects. The skyrmion Hall angle is directly related to the helicity of the skyrmions and poses an unexpected challenge for developing faster and lower input racetrack memories based on spin-orbit torques.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Yang Zhao, Dongying Guo, Zhongming Zeng, Maokang Shen, Yue Zhang, Riccardo Tomasello, Giovanni Finocchio, Ruilong Wang, Shiheng Liang
Summary: Effective control of skyrmion motion is crucial for skyrmion-based devices. The use of unconventional spin Hall effect can influence the motion characteristics of skyrmions, providing a new degree of freedom for controlling the skyrmion Hall angle.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Akira Matsui, Takuya Nomoto, Ryotaro Arita
Summary: Motivated by recent findings on short-pitch skyrmion lattices, this study investigates the skyrmion-size dependence of the topological Hall effect. The Hall conductivity reaches its extreme value in the crossover region where both real-space and momentum-space Berry curvature are crucial. The optimum skyrmion size lambda(sk)*, separating different regions, is found to be less sensitive to the lifetime of itinerant electrons and coupling constant between electrons and localized spins compared to conventional expectations.
Article
Quantum Science & Technology
Seungmo Yang, Kyoung-Woong Moon, Changsoo Kim, Duck-Ho Kim, Jeonghun Shin, Jinpyo Hong, Se Kwon Kim, Chanyong Hwang
Summary: This research presents new insights into the precise control of half-skyrmion motion by completely suppressing the skyrmion Hall effect through deformation of skyrmions' internal structure, which is experimentally achieved by an external magnetic field to steer current-driven half-skyrmions in the desired direction. Moreover, it demonstrates the potential of half-skyrmions application beyond skyrmion-based electronics based on their unique advantages.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Physics, Applied
Sheng Yang, Kai Wu, Yuelei Zhao, Xue Liang, Jing Xia, Yuqing Zhou, Xiangjun Xing, Yan Zhou
Summary: This study investigates the current-driven dynamics of skyrmion bubbles in Pt/Co/Ru multilayer stacks through experimental and micromagnetic simulation methods, and reveals the formation of long stripe domains along the sample edge to protect the skyrmion bubbles from annihilation. Furthermore, the interaction between the stripe domain wall and the skyrmion bubble increases the velocity of the bubbles.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Takayuki Shigenaga, Andrey O. Leonov
Summary: Numerical simulations show that the skyrmion Hall effect can be suppressed in wedge-shaped nanostructures of cubic helimagnets. Ordinary isolated skyrmions were found to move along straight trajectories parallel to the wedge boundaries under an applied electric current.
Article
Chemistry, Physical
Arnab Bhattacharya, Afsar Ahmed, Samik DuttaGupta, I. Das
Summary: Critical behaviour in magnetism and condensed matter physics is essential for understanding spin-spin interactions. The conventional magnetic isotherm analysis is insufficient in studying critical behavior and spin interactions in mesoscopic magnetic devices. This study introduces a magnetotransport approach using anomalous Hall effect to evaluate the critical parameters of a structurally disordered skyrmion hosting itinerant ferromagnet Co3.6Fe4.4Zn8Mn4 and shows excellent agreement with the results obtained from the conventional magnetic isotherm-based analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Mouad Fattouhi, Felipe Garcia-Sanchez, Rocio Yanes, Victor Raposo, Eduardo Martinez, Luis Lopez-Diaz
Summary: This study proposes a method to control current-driven skyrmions using an electric field in hybrid piezoelectric-magnetic systems, which can suppress the skyrmion Hall angle and increase the maximum achievable velocities. The method shows effectiveness under realistic conditions and allows for control of skyrmion trajectories with moderate voltages.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
A. B. Van'kov, A. S. Koreyev, P. S. Berezhnoy, I. V. Kukushkin
Summary: Offbeat spin textures are observed in strongly correlated quantum Hall ferromagnets, suggesting a breakdown of spin-rotational symmetry in the ground state. These textures involve the orbital degree of freedom and are qualitatively different from ordinary skyrmions.