Article
Physics, Fluids & Plasmas
M. H. Jin, L. Xiong, N. J. Zhou, B. Zheng, T. J. Zhou
Summary: By numerically simulating the creep motion of a magnetic domain wall driven by electric current, we accurately determined the creep exponent and roughness exponent from scaling behaviors, finding that the adiabatic and nonadiabatic spin-transfer torques belong to different universality classes and exhibit different scaling relations. Our results are in line with experimental data, but surpass existing theoretical predictions, revealing the impact of disorder-induced pinning effect on altering the universality class of creep motion.
Article
Physics, Multidisciplinary
Danylo T. Matselyukh, Victor Despre, Nikolay Golubev, Alexander Kuleff, Hans Jakob Woerner
Summary: This study reports the observation of charge migration in neutral silane molecules using X-ray attosecond transient-absorption spectroscopy. The experimental results are supported by quantum-mechanical ab initio calculations, revealing the dynamics and mechanism of this migration phenomenon.
Article
Acoustics
Evgeny Vilkov, Oleg Byshevski-Konopko, Pavel Stremoukhov, Ansar Safin, Mikhail Logunov, Dmitry Kalyabin, Sergey Nikitov, Andrei Kirilyuk
Summary: The dynamic interaction between acoustic and magnetic systems has attracted attention, with research showing that the motion of domain walls in magnetic materials can be controlled by launching shear acoustic waves. At sufficiently large shear displacement amplitudes, the speed of the forced domain wall motion can reach a sizable fraction of the speed of sound, due to certain resonance conditions.
Article
Engineering, Mechanical
Giancarlo Consolo, Giovanna Valenti
Summary: This study develops a theory for voltage-induced control of magnetic domain walls propagating along a magnetostrictive nanostrip. The impact of piezo-induced strains on the magnetoelastic field is analyzed, and explicit expressions for key features of domain-wall propagation are derived. Strategies for optimizing voltage-induced control through the selection of ceramic piezoelectric materials and the orientation of dielectric poling are proposed.
Article
Chemistry, Physical
Jiangfeng Lu, Zicong Miao, Zihan Wang, Ying Liu, Dekuan Zhu, Jihong Yin, Fei Tang, Xiaohao Wang, Wenbo Ding, Min Zhang
Summary: A high-efficiency soft robot system driven by a triboelectric nanogenerator is proposed, which can convert mechanical energy into electricity for self-powering. The robot demonstrates autonomous movement, obstacle avoidance, and real-time video streaming capabilities.
Article
Chemistry, Multidisciplinary
Conor J. McCluskey, Matthew G. Colbear, James P. McConville, Shane J. McCartan, Jesi R. Maguire, Michele Conroy, Kalani Moore, Alan Harvey, Felix Trier, Ursel Bangert, Alexei Gruverman, Manuel Bibes, Amit Kumar, Raymond G. P. McQuaid, J. Marty Gregg
Summary: Recent research has revealed the presence of magnetoresistance in domain walls, providing insight into the conduction properties of homointerfaces.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Chendi Yang, Ke Pei, Mingyue Yuan, Gang Qin, Ruixuan Zhang, Longyuan Wang, Liting Yang, Renchao Che
Summary: This study demonstrates a current-pulse-driving strategy to boost the domain wall velocity in Fe3GeTe2, which could have potential applications in spintronic devices with 2D ferromagnetic materials.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Mathematics, Applied
Chiranjeev K. Shahu, Shruti Dubey
Summary: This work investigates the static and dynamic features of transverse domain walls in a magnetostrictive, linear elastic isotropic ferromagnetic material under the action of magnetic field and electric current. The effects of stresses induced by a piezoelectric actuator and Rashba spin-orbit torque caused by structural inversion asymmetry are considered. The study derives the explicit expression of key quantities such as domain wall profile, velocity, mobility, and displacement, and confirms the agreement of the analytical results with numerical simulations and experimental observations.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Myeonghoe Kim, Seong-Hyub Lee, Minhwan Kim, Kitae Kim, Jaesung Yoon, Jung-Hyun Park, Sug -Bong Choe
Summary: The experimental observation shows that the Dzyaloshinskii-Moriya interaction (DMI) plays a decisive role in the domain-wall tilting for various films, indicating the dominance of DMI-induced mechanism in the efficient current-driven domain-wall motion for practical films.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Engineering, Mechanical
Lipeng He, Da Zhao, Wei Li, Xiaoqiang Wu, Guangming Cheng
Summary: A dual piezoelectric energy harvester driven by an inertial wheel was designed to study the impact of inertial wheel mass on generator performance. The study showed that the harvester performed well under different driving conditions, with an energy conversion efficiency of 18.27%, making it suitable for collecting energy during idle periods to power sensors.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Physics, Applied
Can Onur Avci, Charles-Henri Lambert, Giacomo Sala, Pietro Gambardella
Summary: The study focuses on achieving all-electrical write and readout of magnetization through current injection, and demonstrates that replacing a Pt spacer with a Cu spacer can improve the giant magnetoresistance of the device. This type of device provides an alternative route to fabricate a two-terminal spintronic memory.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Min Wang, Zhaohao Wang, Chao Wang, Weisheng Zhao
Summary: This research proposes a novel field-free deterministic magnetization switching scheme by using two currents sequentially passing interlaced paths in a regular magnetic tunnel junction. The switching is bipolar since the final magnetization state depends on the combination of current paths. The functionality and robustness of the proposed scheme are validated through both macrospin and micromagnetic simulation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Mechanical
Peng-Zhi Li, De-Fu Zhang, Barry Lennox, Farshad Arvin
Summary: This paper investigates a novel 3-degree-of-freedom nanopositioner designed for accurate positioning of objects at the nanometer scale. The nanopositioner utilizes advanced technologies such as a flexure diaphragm guider and walking piezoelectric actuators. Experimental results demonstrate excellent performance in terms of positioning accuracy, coupling displacement, and dynamic response in the Z direction.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Ziyang Yu, Bin Gong, Lun Xiong, Xinran Du, Chenhuinan Wei, Rui Xiong, Zhihong Lu, Yue Zhang
Summary: This paper proposes a racetrack memory with the advantages of small size and high reading speed based on current-induced domain wall motion in a ferromagnetic nanowire. The enhancement of domain wall velocity can be achieved by inter-wire magnetostatic coupling in a double nanowire system. By adjusting the magnetic anisotropy constant difference, the manipulation of working current density is possible.
NANOSCALE ADVANCES
(2022)
Article
Computer Science, Information Systems
Laihu Peng, Yubao Qi, Jianting Liu, Yuan Sun, Hongfei Zu, Xin Ru
Summary: This study designed and demonstrated a dual-piezoelectric energy harvesting system, driven by a cantilever beam and featuring a multipoint energy harvesting strategy. The research found that the dual-piezoelectric energy harvesting device has a higher energy harvesting efficiency than single-piezoelectric energy harvesting devices.
Article
Chemistry, Multidisciplinary
Tom S. Seifert, Ulrike Martens, Florin Radu, Mirkow Ribow, Marco Berritta, Lukas Nadvornik, Ronald Starke, Tomas Jungwirth, Martin Wolf, Ilie Radu, Markus Muenzenberg, Peter M. Oppeneer, Georg Woltersdorf, Tobias Kampfrath
Summary: The anomalous Hall effect (AHE) remains operative from DC up to 40 THz in thin films of technologically relevant magnetic materials, with the large Drude scattering rate of metal thin films smearing out any sharp spectral features of the THz AHE. The intrinsic contribution dominates over the extrinsic mechanisms in the THz AHE for the Co32Fe68 sample, indicating promising potential for future THz spintronic devices operating reliably from DC to 40 Thz.
ADVANCED MATERIALS
(2021)
Article
Physics, Multidisciplinary
Rafael Gonzalez-Hernandez, Libor Smejkal, Karel Vyborny, Yuta Yahagi, Jairo Sinova, Tomas Jungwirth, Jakub Zelezny
Summary: Through ab initio calculations, it was discovered that the metallic collinear antiferromagnet RuO2 can efficiently generate spin current at room temperature, with a 34 degrees propagation angle between spin-up and spin-down currents. The corresponding spin conductivity is three times larger than the highest value found in a survey of 20,000 nonmagnetic spin-Hall materials. A versatile spin-splitter-torque concept is proposed to overcome limitations in current magnetic memory devices.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Sonka Reimers, Dominik Kriegner, Olena Gomonay, Dina Carbone, Filip Krizek, Vit Novak, Richard P. Campion, Francesco Maccherozzi, Alexander Bjorling, Oliver J. Amin, Luke X. Barton, Stuart F. Poole, Khalid A. Omari, Jan Michalicka, Ondrej Man, Jairo Sinova, Tomas Jungwirth, Peter Wadley, Sarnjeet S. Dhesi, Kevin W. Edmonds
Summary: This study reveals that the antiferromagnetic (AF) domain structure in CuMnAs thin films is dominated by nanoscale structural twin defects, which play a crucial role in determining the location and orientation of AF domain walls. The results provide insights into the interplay of crystalline defects, strain, and magnetic ordering in AF materials, offering a route to optimize device performance.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Libor Smejkal, Anna Birk Hellenes, Rafael Gonzalez-Hernandez, Jairo Sinova, Tomas Jungwirth
Summary: In this study, we propose that giant and tunneling magnetoresistance effects can be achieved in unconventional collinear antiferromagnets. We present archetype model mechanisms for these effects in multilayers composed of these unconventional collinear antiferromagnets and predict an approximately 100% scale for the effects based on first-principles calculations. We also highlight the ability of the alternating spin-momentum coupling to enable magnetic excitation by spin-transfer torque.
Article
Physics, Applied
J. J. F. Heitz, L. Nadvornik, V Balos, Y. Behovits, A. L. Chekhov, T. S. Seifert, K. Olejnik, Z. Kaspar, K. Geishendorf, V Novak, R. P. Campion, M. Wolf, T. Jungwirth, T. Kampfrath
Summary: The study demonstrates complete suppression of terahertz-pulse-induced resistance switching in antiferromagnetic CuMnAs thin films using ultrafast gating. Gating functionality is achieved through optically generated transiently conductive parallel channels in the semiconductor substrate, with suppression timescale determined by photocarrier lifetime. Effects observed are mediated primarily by the substrate, with potential application for transient low-power masking of structured areas with feature sizes of about 200 nm and smaller.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Physical
Yang Zhang, Qiunan Xu, Klaus Koepernik, Roman Rezaev, Oleg Janson, Jakub Zelezny, Tomas Jungwirth, Claudia Felser, Jeroen van den Brink, Yan Sun
Summary: The study found a strong relationship between spin Hall conductivity (SHC) and crystalline symmetry, with large SHC typically associated with mirror symmetry-protected nodal line band structures. They also identified 11 materials with substantial SHC, comparable to or larger than that of Pt. Different types of spin currents were found, and it was discovered that they can be obtained by rotating applied electrical fields.
NPJ COMPUTATIONAL MATERIALS
(2021)
Review
Nanoscience & Nanotechnology
Libor Smejkal, Allan H. MacDonald, Jairo Sinova, Satoru Nakatsuji, Tomas Jungwirth
Summary: This review organizes the current understanding of anomalous antiferromagnetic materials that generate a Hall effect and discusses their applications in spintronics, topological condensed matter, and multipole magnetism.
NATURE REVIEWS MATERIALS
(2022)
Article
Multidisciplinary Sciences
Filip Krizek, Sonka Reimers, Zdenek Kaspar, Alberto Marmodoro, Jan Michalicka, Ondrej Man, Alexander Edstrom, Oliver J. Amin, Kevin W. Edmonds, Richard P. Campion, Francesco Maccherozzi, Samjeet S. Dhesi, Jan Zubac, Dominik Kriegner, Dina Carbone, Jakub Zelezny, Karel Vyborny, Kamil Olejnik, Vit Novak, Jan Rusz, Juan-Carlos Idrobo, Peter Wadley, Tomas Jungwirth
Summary: This paper explores magnetic textures at the ultimate atomic scale in antiferromagnetic CuMnAs and achieves atomic resolution imaging using differential phase-contrast imaging within aberration-corrected scanning transmission electron microscopy. The study reveals abrupt domain walls corresponding to the Neel order reversal between neighboring atomic planes. The findings shed light on the development of electrical and ultrafast optical antiferromagnetic devices with magnetic field-insensitive neuromorphic functionalities.
Article
Physics, Multidisciplinary
Libor Smejkal, Jairo Sinova, Tomas Jungwirth
Summary: Recent research has focused on spintronic and spin-splitting phenomena that break time-reversal symmetry. This study introduces a new approach based on nonrelativistic spin-symmetry groups to resolve the conflicting notions of unconventional ferromagnetism or antiferromagnetism and proposes a third type of magnetic phase. The research identifies crystal-rotation symmetries and characteristics of materials hosting this phase, including alternating spin-splitting sign and broken time-reversal symmetry.
Article
Physics, Multidisciplinary
R. D. Gonzalez Betancourt, J. Zubac, R. Gonzalez-Hernandez, K. Geishendorf, Z. Soban, G. Springholz, K. Olejnik, L. Smejkal, J. Sinova, T. Jungwirth, S. T. B. Goennenwein, A. Thomas, H. Reichlova, J. Zelezny, D. Kriegner
Summary: A spontaneous anomalous Hall signal was observed in an epitaxial film of MnTe, a semiconductor with collinear antiparallel magnetic ordering and zero net magnetization, even in the absence of an external magnetic field. The anomalous Hall effect originates from the unconventional phase with strong time-reversal symmetry breaking and alternating spin polarization. The anisotropic crystal environment of Mn atoms, caused by nonmagnetic Te atoms, plays a vital role in establishing the unconventional phase and generating the anomalous Hall effect.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Libor Smejkal, Jairo Sinova, Tomas Jungwirth
Summary: Magnetism is a significant and technologically relevant field in condensed-matter physics, traditionally characterized by ferromagnetism and antiferromagnetism. However, a new magnetic phase called altermagnetism has recently been discovered, which exhibits unique features in spin symmetry and net magnetization. Investigating this phenomenon allows for a deeper understanding of condensed-matter physics and its impact on other research areas.
Correction
Engineering, Electrical & Electronic
Zexin Feng, Xiaorong Zhou, Libor Smejkal, Lei Wu, Zengwei Zhu, Huixin Guo, Rafael Gonzalez-Hernandez, Xiaoning Wang, Han Yan, Peixin Qin, Xin Zhang, Haojiang Wu, Hongyu Chen, Ziang Meng, Li Liu, Zhengcai Xia, Jairo Sinova, Tomas Jungwirth, Zhiqi Liu
NATURE ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zexin Feng, Xiaorong Zhou, Libor Smejkal, Lei Wu, Zengwei Zhu, Huixin Guo, Rafael Gonzalez-Hernandez, Xiaoning Wang, Han Yan, Peixin Qin, Xin Zhang, Haojiang Wu, Hongyu Chen, Ziang Meng, Li Liu, Zhengcai Xia, Jairo Sinova, Tomas Jungwirth, Zhiqi Liu
Summary: This study reports an anomalous Hall effect in collinear altermagnetic ruthenium dioxide, with an anomalous Hall conductivity exceeding 1,000 omega(-1) cm(-1). The phenomenon arises from an alternative magnetic phase in RuO2, characterized by alternating spin polarization in both real-space crystal structure and momentum-space band structure. The results could potentially lead to the exploration of topological Berry phases and dissipationless quantum transport in crystals of abundant elements and with a compensated antiparallel magnetic order.
NATURE ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Jan Zubac, Zdenek Kaspar, Filip Krizek, Tobias Foerster, Richard P. Campion, Vit Novak, Tomas Jungwirth, Kamil Olejnik
Summary: This paper investigates magnetoresistance effects in antiferromagnetic CuMnAs upon switching into high-resistive states, revealing hysteresis phenomena and the resilience of the switching signal. These properties are discussed in the context of recent studies of antiferromagnetic textures in CuMnAs.
Article
Materials Science, Multidisciplinary
J. Zelezny, Z. Fang, K. Olejnik, J. Patchett, F. Gerhard, C. Gould, L. W. Molenkamp, C. Gomez-Olivella, J. Zemen, T. Tichy, T. Jungwirth, C. Ciccarelli
Summary: This research investigates spin-orbit torque and unidirectional magnetoresistance in the room-temperature ferromagnet NiMnSb with inversion asymmetry. The competition of Rashba- and Dresselhaus-type spin-orbit couplings plays a crucial role in determining the effects, and commonly used approaches for interpreting experiments may not be directly applicable. The unidirectional magnetoresistance has both longitudinal and transverse components, which complicates its separation from thermoelectric contributions in experimental techniques.
