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| Open AccessQuantum annealing of a frustrated magnet
Quantum annealing is usually discussed as a means of finding an optimal solution for a problem where there are many local minima, such as the travelling salesman. Here, Zhao et al present an intriguing example of quantum annealing in the case of the frustrated magnet α-CoV2O6, where a transverse magnetic field triggers the quantum annealing process.
- Yuqian Zhao
- , Zhaohua Ma
- & Yuesheng Li
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Article
| Open AccessMagnetically propagating Hund’s exciton in van der Waals antiferromagnet NiPS3
Recently, excitons with unconventional properties were reported in a van der Waals antiferromagnet NiPS3. Here, using resonant inelastic x-ray scattering, the authors show that the formation of these excitons is primarily driven by Hund’s coupling and that they propagate similarly to two-magnon excitations.
- W. He
- , Y. Shen
- & M. P. M. Dean
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Article
| Open AccessRe-order parameter of interacting thermodynamic magnets
Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here the authors introduce a dynamic re-order parameter, in particular magnons, and illustrate it in a material with complex magnetic phases.
- Byung Cheol Park
- , Howon Lee
- & Taewoo Ha
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Article
| Open AccessDistinct skyrmion phases at room temperature in two-dimensional ferromagnet Fe3GaTe2
Most 2D magnets support only a single skyrmion phase. Here, the authors observe two distinct topological phases: Bloch and hybrid skyrmions, with high thermostability in the room-temperature ferromagnet Fe3GaTe2.
- Xiaowei Lv
- , Hualiang Lv
- & Renchao Che
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Article
| Open AccessThree-dimensional spin-wave dynamics, localization and interference in a synthetic antiferromagnet
The techniques we typically employ to study spin-waves in magnetic materials, such as Brillouin Light Scattering, are two-dimensional. Spin waves, however, are manifestly three-dimensional. Here, Girardi et al. succeed in such three-dimensional imaging of spin waves in a synthetic antiferromagnet using Time-Resolved Soft X-ray Laminography.
- Davide Girardi
- , Simone Finizio
- & Edoardo Albisetti
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Article
| Open AccessNonlinear optical diode effect in a magnetic Weyl semimetal
Here the authors demonstrate a broadband nonlinear optical diode effect and its electric control in the magnetic Weyl semimetal CeAlSi. Their findings advance ongoing research to identify novel optical phenomena in topological materials.
- Christian Tzschaschel
- , Jian-Xiang Qiu
- & Su-Yang Xu
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Article
| Open AccessHidden non-collinear spin-order induced topological surface states
Several recent experimental studies have found disconnected Fermi surface arcs emerging below the Neel temperature in several rare-earth mono-pnictides. While these electronic states have been attributed to a non-collinear antiferromagnetic order, experimental evidence of this has been lacking. Here Huang et al demonstrate the emergence of non-collinear antiferromagnetic order using spin-polarized scanning tunnelling microscopy.
- Zengle Huang
- , Hemian Yi
- & Weida Wu
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Article
| Open AccessIntrinsic exchange biased anomalous Hall effect in an uncompensated antiferromagnet MnBi2Te4
Exchange bias occurs in a variety of magnetic materials and heterostructures. The quintessential example occurs in antiferromagnetic/ferromagnetic heterostructures and has been employed extensively in magnetic memory devices. Here, via a specific field training protocol, the authors demonstrate an exchange bias of up to 400mT in odd layered MnBi2Te4.
- Su Kong Chong
- , Yang Cheng
- & Kang L. Wang
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Article
| Open AccessCreation of flexible spin-caloritronic material with giant transverse thermoelectric conversion by nanostructure engineering
Nanostructure engineering enables transforming simple magnetic alloys into spincaloritronic materials with large transverse thermoelectric conversion. This has led to a high anomalous Nernst coefficient in flexible Fe-based amorphous alloys.
- Ravi Gautam
- , Takamasa Hirai
- & Hossein Sepehri-Amin
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Article
| Open AccessElectrically controlled nonvolatile switching of single-atom magnetism in a Dy@C84 single-molecule transistor
Manipulating single-atom magnetism via an electric field promotes the downsizing of memories and transistors towards the atomic limit. Wang et al. show the electrically controlled Zeeman effect in Dy@C84 single-molecule transistors with magnetoresistance from 600% to 1,100% at the resonant tunnelling point.
- Feng Wang
- , Wangqiang Shen
- & Fengqi Song
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Article
| Open AccessStructural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure
Recently superconductivity with Tc of about 80 K was discovered in a bilayer nickelate La3Ni2O7 under high pressure. Here the authors report a density functional theory and random phase approximation study of structural and electronic properties as a function of pressure and discuss the pairing mechanism.
- Yang Zhang
- , Ling-Fang Lin
- & Elbio Dagotto
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Article
| Open AccessUltrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet
Magnetic type-II Weyl semimetals host a variety of intriguing physical phenomena due to the combination of magnetic ordering and the electronic properties of the Weyl nodes. Herein, the authors explore the ultrafast spin dynamics of the magnetic Weyl semimetal, Co3Sn2S2, observing a transient enhanced magnetization as a result of laser excitation.
- Xianyang Lu
- , Zhiyong Lin
- & Yongbing Xu
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Article
| Open AccessQuantum spin liquid signatures in monolayer 1T-NbSe2
Recently, signatures of quantum spin liquid have been reported in monolayer transition metal dichalcogenides. Here the authors report evidence of such state in 1T-NbSe2 via the measurements of the Kondo effect in a 1T-1H heterostructure, further supported by measurements for magnetic molecules on 1T-NbSe2.
- Quanzhen Zhang
- , Wen-Yu He
- & Yeliang Wang
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Article
| Open AccessRevealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal
The authors study the field-induced ferromagnetic state of MnBi2-xSbxTe4 by quantum oscillations and high-field Hall effect measurements. They confirm a single pair of type-II Weyl nodes, the long-sought “ideal” Weyl semimetal.
- Qianni Jiang
- , Johanna C. Palmstrom
- & Jiun-Haw Chu
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Article
| Open AccessPressure-tuned quantum criticality in the large-D antiferromagnet DTN
Gapped quantum antiferromagnets can undergo field or pressure induced phase transitions to the magnetically ordered state, which have distinct critical exponents. While there are many examples of field induced transitions, thus far the pressure induced case has proven difficult to realize. Herein, the authors demonstrate such a pressure driven phase transition in the quantum antiferromagnet, DTN.
- Kirill Yu. Povarov
- , David E. Graf
- & Sergei A. Zvyagin
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Article
| Open AccessVortex-based soft magnetic composite with ultrastable permeability up to gigahertz frequencies
The development of higher frequency transformers and inductors requires soft magnetic materials with stable permeability up to GHz frequencies, however, such soft magnetic materials are current lacking. Here Bai et al demonstrate a soft magnetic composite featuring isolated magnetic vortices, which endow the material with a stable permeability over a GHz range of frequency.
- Guohua Bai
- , Jiayi Sun
- & Xuefeng Zhang
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Article
| Open AccessReconfigurable spin current transmission and magnon–magnon coupling in hybrid ferrimagnetic insulators
Recently there has been a surge of interest in using magnons, the quasi-particles of spin-waves in magnetic systems, for information processing, driven by the potentially very low energy consumption. Here, by adjusting the magnetic compensation in a ferrimagnet, Li et al demonstrate magnon–magnon coupling, and controllable spin wave mediated spin current transmission.
- Yan Li
- , Zhitao Zhang
- & Xixiang Zhang
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Article
| Open AccessThree-dimensional magnetic nanotextures with high-order vorticity in soft magnetic wireframes
The spin texture of a magnetic system can host a variety of topological spin textures, the most famous of these being skyrmions. Here, Volkov et al demonstrate higher order vorticity in magnetic wireframe nanostructures and introduce a general protocol for the creation of arbitrary numbers of vortices and antivortices in such wireframe structures.
- Oleksii M. Volkov
- , Oleksandr V. Pylypovskyi
- & Denys Makarov
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Article
| Open AccessUltrastrong to nearly deep-strong magnon-magnon coupling with a high degree of freedom in synthetic antiferromagnets
Deep-strong coupling in hybrid magnonic systems is yet to be explored. Here, the authors unveil unconventional coupling properties in synthetic antiferromagnets. The systems’ high degree of freedom enables a near-realization of deep-strong coupling.
- Yuqiang Wang
- , Yu Zhang
- & Guoqiang Yu
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Article
| Open AccessSelf-assembly of Co/Pt stripes with current-induced domain wall motion towards 3D racetrack devices
The authors report an alternative approach to build 3D magnetic memories by rolling Co/Pt stripes on flexible polymers in compact geometry, and simultaneously offering current-induced domain wall motion and strain-induced domain wall speed control.
- Pavel Fedorov
- , Ivan Soldatov
- & Daniil Karnaushenko
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Article
| Open AccessOrbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments
Several recent works have highlighted the importance of the orbital currents in transferring angular momentum within materials. In combination with spin-orbit coupling, such orbital currents can be used to alter the magnetization of a material. Herein, the authors demonstrate the inverse effect, showing orbital current driven terahertz emission in Nickel based heterostructures.
- Yong Xu
- , Fan Zhang
- & Weisheng Zhao
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Article
| Open AccessCompeting itinerant and local spin interactions in kagome metal FeGe
FeGe is a Kagome metal that exhibits a very rich array of magnetic and electronic phases. Here, using neutron scattering, Chen et al add to this zoo, by showing the emergence of a spin density wave order.
- Lebing Chen
- , Xiaokun Teng
- & Pengcheng Dai
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Article
| Open AccessField-free spin–orbit torque switching in ferromagnetic trilayers at sub-ns timescales
Magnetic random access memory current uses spin transfer torque for switching, which limits the speed of switching operation, and the number of times the device can be switched before failure. Here, Yang et al. demonstrate field free switching using spin-orbit torque offering a pathway to overcome these limitations.
- Qu Yang
- , Donghyeon Han
- & Hyunsoo Yang
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Article
| Open AccessFinite-momentum Cooper pairing in proximitized altermagnets
An altermagnet has highly anisotropic spin splitting but zero net magnetization. Here, S.-B. Zhang et al. theoretically study the behavior of s-wave superconductor/altermagnet hybrid structures, finding that Cooper pairs in the proximitized altermagnet have an anisotropic non-zero momentum.
- Song-Bo Zhang
- , Lun-Hui Hu
- & Titus Neupert
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Article
| Open AccessHomochiral antiferromagnetic merons, antimerons and bimerons realized in synthetic antiferromagnets
Topological antiferromagnetic spin textures, including merons, antimerons, and bimerons, are demonstrated in synthetic antiferromagnets by three-dimensional vector imaging of the Néel order parameter and investigated by micromagnetic analysis.
- Mona Bhukta
- , Takaaki Dohi
- & Mathias Kläui
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Article
| Open AccessChiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers
S. X. M. Riberolles et al. study the kagome Chern insulator TbMn6Sn6 via inelastic neutron scattering. They observe signatures of chiral and flat-band magnons, which are highly localized in real space and strongly damped in the time domain.
- S. X. M. Riberolles
- , Tyler J. Slade
- & R. J. McQueeney
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Article
| Open AccessHighly anisotropic Fe3C microflakes constructed by solid-state phase transformation for efficient microwave absorption
Fe3C microflakes with high magnetic anisotropy are prepared through solid-state phase transformation and electrochemical dealloying. The magnetic anisotropy can be tuned by adjusting the morphology, resulting in optimized ferromagnetic resonance behavior for microwave absorption
- Rongzhi Zhao
- , Tong Gao
- & Gaowu Qin
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Article
| Open AccessTunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi
Topological semimetals with space-inversion and time-reversal symmetry breaking have attracted attention recently. Here, using a combination of experimental techniques and calculations, the authors demonstrate the tunability of the Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi.
- Erjian Cheng
- , Limin Yan
- & Bernd Büchner
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Article
| Open AccessElectric control of optically-induced magnetization dynamics in a van der Waals ferromagnetic semiconductor
The combination of strong light-matter interactions and controllable magnetic properties make magnetic semiconductors attractive for both fundamental physics and the development of devices. Here, Hendriks et al show how the optically driven magnetization dynamics in Cr2Ge2Te6 can be controlled via electrostatic gating.
- Freddie Hendriks
- , Rafael R. Rojas-Lopez
- & Marcos H. D. Guimarães
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Article
| Open AccessOptical Tellegen metamaterial with spontaneous magnetization
Here the authors propose an isotropic three-dimensional metamaterial with nonreciprocal magnetoelectric resonant responses at visible and mid-infrared frequencies. The proposed metamaterials do not require external magnetization.
- Shadi Safaei Jazi
- , Ihar Faniayeu
- & Viktar Asadchy
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Article
| Open AccessInterfacial magnetic spin Hall effect in van der Waals Fe3GeTe2/MoTe2 heterostructure
Charge-to-spin conversion allows for the generation and control of spin polarization via a charge current. Typically, this is done with non-magnetic materials with large spin-orbit interactions such as Platinum. Herein, Dai et al demonstrate an intriguing charge-to-spin mechanism, a magnetic spin Hall effect, in a van der Waals heterostructure.
- Yudi Dai
- , Junlin Xiong
- & Feng Miao
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Article
| Open AccessRoom-temperature sub-100 nm Néel-type skyrmions in non-stoichiometric van der Waals ferromagnet Fe3-xGaTe2 with ultrafast laser writability
Authors uncover room-temperature skyrmions in 2D van der Waals material, attributing their presence to Fe-deficiency-induced symmetry breaking, enabling topological Hall effect and small Néel-type skyrmions with femtosecond laser writability.
- Zefang Li
- , Huai Zhang
- & Xuewen Fu
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Article
| Open AccessClocked dynamics in artificial spin ice
Artificial spin ices are nanomagnetic metamaterials, whose collective magnetization self-organizes into extended domains. However, controlling when, where and how domains change has proven difficult, yet is crucial for technological applications. Here, Jensen and Strømberg et al. introduce astroid clocking, which enables controlled, stepwise growth and reversal of magnetic domains, using only global fields.
- Johannes H. Jensen
- , Anders Strømberg
- & Erik Folven
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Article
| Open AccessHigh-throughput computational stacking reveals emergent properties in natural van der Waals bilayers
2D bilayers have recently attracted significant attention due to fundamental properties like interlayer excitons and interfacial ferroelectricity. Here, the authors report a density functional theory approach to identify 2586 stable homobilayer systems and calculate their stacking-dependent electronic, magnetic and vibrational properties.
- Sahar Pakdel
- , Asbjørn Rasmussen
- & Kristian S. Thygesen
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Article
| Open AccessPhase transitions associated with magnetic-field induced topological orbital momenta in a non-collinear antiferromagnet
Recent work has demonstrated the potential of polycrystalIine antiferromagnetic materials for spintronics. Here the authors report evidence of magnetic phase transitions in a polycrystalline non-collinear antiferromagnet, which are explained by a phenomenological model with topological orbital momenta.
- Sihao Deng
- , Olena Gomonay
- & Christoph Sürgers
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Article
| Open AccessEffective electrical manipulation of a topological antiferromagnet by orbital torques
Electrical control of topological magnets is of great interest for future spintronic applications. Here, the authors demonstrate the effective manipulation of antiferromagnetic order in a Weyl semimetal using orbital torques, with implications for neuromorphic device applications.
- Zhenyi Zheng
- , Tao Zeng
- & Jingsheng Chen
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Article
| Open AccessUltrafast and persistent photoinduced phase transition at room temperature monitored by streaming powder diffraction
Photoinduced phase transitions occur in a variety of materials and allow for the optical control of the materials properties. Here, Herve et al present a streaming powder X-ray diffraction method allowing them to study the ultrafast photoinduced phase transition of Rb0.94Mn0.94Co0.06[Fe(CN)6]0.9 within thermal hysteresis.
- Marius Hervé
- , Gaël Privault
- & Eric Collet
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Article
| Open AccessMagnon thermal Hall effect via emergent SU(3) flux on the antiferromagnetic skyrmion lattice
Strongly correlated and topological phases of matter can be often described using the tools of quantum field theory. Here the authors report the thermal Hall effect in the antiferromagnetic skyrmion lattice of MnSc2S4, revealing transport features that can be attributed to an emergent SU(3) gauge field.
- Hikaru Takeda
- , Masataka Kawano
- & Chisa Hotta
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Article
| Open AccessField control of quasiparticle decay in a quantum antiferromagnet
Quasiparticles’ have formed an extremely effective explanation for the charge, spin and lattice excitations of materials, allowing for the otherwise complex response to be explained in terms of a single (quasi)particle with an effective Hamiltonian. Here, Hasegawa et al demonstrate the tuning of magnon quasiparticle decay in the quantum antiferromagnet, RbFeCl3.’
- Shunsuke Hasegawa
- , Hodaka Kikuchi
- & Takatsugu Masuda
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Article
| Open AccessTracking a spin-polarized superconducting bound state across a quantum phase transition
The Yu-Shiba-Rusinov state, arising from exchange coupling between a magnetic impurity and a superconductor, undergoes a quantum phase transition at a critical coupling. In a scanning tunnelling microscopy experiment, Karan et al. reveal distinct tunnelling spectra on each side of the transition in a magnetic field, which allows them to distinguish the free spin regime from the screened spin regime.
- Sujoy Karan
- , Haonan Huang
- & Christian R. Ast
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Article
| Open AccessField-induced bound-state condensation and spin-nematic phase in SrCu2(BO3)2 revealed by neutron scattering up to 25.9 T
SrCu2(BO3)2 realizes the Shastry-Sutherland model (SSM), a 2D frustrated dimer model. Here, via high-magnetic-field inelastic neutron scattering measurements and matrix-product-state calculations, Fogh et al. find evidence for Bose-Einstein condensation of S = 2 two-triplon bound states, which is a spin-nematic phase.
- Ellen Fogh
- , Mithilesh Nayak
- & Henrik M. Rønnow
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Article
| Open AccessThermal Hall effects due to topological spin fluctuations in YMnO3
The thermal Hall effect has been reported in several materials, but it is not expected in triangular lattice systems due to chirality cancellation. Kim et al. report the thermal Hall effect attributed to topological spin fluctuations in the supposedly paramagnetic phase of YMnO3 with a trimerized triangular lattice.
- Ha-Leem Kim
- , Takuma Saito
- & Je-Geun Park
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Article
| Open AccessField-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe2
The superconductor UTe2 exhibits a reentrant superconducting phase at magnetic fields above 40 T for particular field angles. Here, from high-field Hall-effect measurements, T. Helm et al. find evidence for a partial compensation between the applied field and an exchange field, pointing to the Jaccarino-Peter effect as a possible mechanism for the reentrant superconductivity.
- Toni Helm
- , Motoi Kimata
- & Jean-Pascal Brison
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Article
| Open AccessTransition to the Haldane phase driven by electron-electron correlations
At the microscopic level, the localized spins arise due to the electron-electron interactions. Here, the authors show how a topological phase of the Haldane spin chain emerges in a two-orbital Hubbard model with increasing interaction strength.
- A. Jażdżewska
- , M. Mierzejewski
- & J. Herbrych
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Article
| Open AccessMagnetic order in 2D antiferromagnets revealed by spontaneous anisotropic magnetostriction
Van der Waals antiferromagnets offer a unique platform for studying magnetism in reduced dimensions, however, the low dimensionality, combined with lack of net magnetization, renders investigation challenging with conventional experimental probes. Here, Houmes et al show how van der Waals antiferromagnets can be investigated via the resonances of a vibrating rectangular membranes of this material.
- Maurits J. A. Houmes
- , Gabriele Baglioni
- & Herre S. J. van der Zant
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Article
| Open AccessLarge exchange bias enhancement and control of ferromagnetic energy landscape by solid-state hydrogen gating
“Exchange bias” occurs in heterostructures of antiferromagnets and ferromagnetic materials, which biases the magnetization of the ferromagnet so that it exhibits a preferred direction. This phenomenon has proven critical for the development of a variety of spintronic devices. Here, Hasan et al demonstrate reversible control of exchange bias via solid-state hydrogen gating.
- M. Usama Hasan
- , Alexander E. Kossak
- & Geoffrey S. D. Beach
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Article
| Open AccessA hard molecular nanomagnet from confined paramagnetic 3d-4f spins inside a fullerene cage
Shortening the inter-spin distance is an effective way to enhance magnetic coupling. However, it is typically challenging to change the inter-ion distance in most magnetic systems. Here, Huang et al present a strategy for enhancing magnetic interactions, by confining a molecular magnetic system inside a carbon fullerene cage, leading to enhanced magnetic properties.
- Chenli Huang
- , Rong Sun
- & Song Gao
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Article
| Open AccessTetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co1/3TaS2
Skyrmion crystals, where skyrmions are arranged close packed in a triangular lattice arise due to the superposition of three magnetic spin spirals, each with a distinct wave vector, Q. Such skrymion crystals have been found in a diverse array of materials. Here, Park et al find a short wavelength (or dense skyrmion) limit of this skyrmion crystal structure in Co1/3TaS2, a metallic triangular lattice antiferromagnet, in the form of a triple Q magnetic ordering, with four magnetic sublattices.’
- Pyeongjae Park
- , Woonghee Cho
- & Je-Geun Park
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Article
| Open AccessHyperbolic exciton polaritons in a van der Waals magnet
Hyperbolic exciton polaritons (HEPs) are anisotropic light-matter excitations with promising applications, but their steady-state observation is challenging. Here, the authors report experimental evidence of HEPs in a van der Waals magnet, CrSBr, via cryogenic infrared near-field microscopy.
- Francesco L. Ruta
- , Shuai Zhang
- & D. N. Basov