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Letter |
Observation of magnetic vortex pairs at room temperature in a planar α-Fe2O3/Co heterostructure
Magnetic vortices formed in antiferromagnetic haematite and imprinted on a Co ferromagnetic over-layer have been observed using X-ray magnetic linear and circular dichroism photoemission electron microscopy. These vortex pairs can be manipulated by the application of magnetic fields.
- F. P. Chmiel
- , N. Waterfield Price
- & P. G. Radaelli
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Letter |
Spin colossal magnetoresistance in an antiferromagnetic insulator
In the antiferromagnetic insulator Cr2O3 a strong modulation of the spin conduction with magnetic field near the Néel temperature is measured. By analogy with its charge counterpart, this effect is termed spin colossal magnetoresistance.
- Zhiyong Qiu
- , Dazhi Hou
- & Eiji Saitoh
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Article |
Significant Dzyaloshinskii–Moriya interaction at graphene–ferromagnet interfaces due to the Rashba effect
Authors investigate graphene/cobalt and graphene/nickel interfaces, and observe a non-zero Dzyaloshinskii–Moriya interaction that they attribute to the Rashba effect; calculations suggest the effect can be enhanced in van der Waals heterostructures.
- Hongxin Yang
- , Gong Chen
- & Mairbek Chshiev
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Letter |
An unusual continuous paramagnetic-limited superconducting phase transition in 2D NbSe
2
Tunnelling spectroscopy reveals a continuous closing of the superconducting gap at low temperature and high in-plane magnetic field in few-layer NbSe2, due to the Ising spin–orbit coupling of these materials.
- Egon Sohn
- , Xiaoxiang Xi
- & Kin Fai Mak
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News & Views |
Gas vesicles as collapsible MRI contrast agents
Microbial gas vesicles have been developed for use as MRI contrast agents whose contrast can be inactivated by applying ultrasound waves to collapse the vesicles.
- Jeff W. M. Bulte
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News & Views |
At the flick of a switch
Voltage control of recently discovered two-dimensional magnets has been demonstrated, highlighting their potential for low-power data storage.
- Ajit Srivastava
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Letter |
Enhanced spin pumping into superconductors provides evidence for superconducting pure spin currents
Ferromagnetic resonance experiments show enhanced spin pumping in superconductors in the presence of spin sink layers.
- Kun-Rok Jeon
- , Chiara Ciccarelli
- & Mark G. Blamire
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Letter |
Electric-field switching of two-dimensional van der Waals magnets
The application of electric fields enables reversible switching of the magnetic order of CrI3 bilayers between antiferromagnetic and ferromagnetic states.
- Shengwei Jiang
- , Jie Shan
- & Kin Fai Mak
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Article |
Acoustically modulated magnetic resonance imaging of gas-filled protein nanostructures
Gas-filled vesicles derived from photosynthetic microbes are shown to elicit magnetic resonance imaging contrast in vitro and in vivo with the potential for acoustically modulated multiplexing and molecular sensing.
- George J. Lu
- , Arash Farhadi
- & Mikhail G. Shapiro
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Letter |
Atomic scale imaging of magnetic circular dichroism by achromatic electron microscopy
By combining electron energy-loss magnetic chiral dichroism and chromatic-aberration-corrected transmission electron microscopy, it becomes possible to achieve atomic-scale imaging of magnetic circular dichroism.
- Zechao Wang
- , Amir H. Tavabi
- & Xiaoyan Zhong
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Article |
Spontaneous exchange bias formation driven by a structural phase transition in the antiferromagnetic material
The exchange bias effect in IrMn/FeCo is driven by a phase transition in the IrMn layer at room temperature, and occurs without the typical field-cooling sequence across the antiferromagnet Neel temperature.
- A. Migliorini
- , B. Kuerbanjiang
- & J. L. Prieto
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News & Views |
A ratchet made of tiny magnets
An artificial spin ice array exploits two-dimensional chirality to take a step towards technology.
- Steven T. Bramwell
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Letter |
Emergent dynamic chirality in a thermally driven artificial spin ratchet
A structurally chiral two-dimensional array of nanomagnets is shown to thermally relax its magnetization by rotation in a preferential direction, behaving as a magnetic ratchet.
- Sebastian Gliga
- , Gino Hrkac
- & Laura J. Heyderman
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News & Views |
A new member of the Hall family
The spin Nernst effect — a spin accumulation in a ferromagnet in the direction normal to an applied thermal gradient and external magnetic field — has been experimentally demonstrated.
- Joseph P. Heremans
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Letter |
Fast domain wall motion in the vicinity of the angular momentum compensation temperature of ferrimagnets
Fast field-driven antiferromagnetic spin dynamics is realized in ferrimagnetic Gd23Fe67.4Co9.6 thin films at the angular momentum compensation point. In particular, at this point, the field-driven domain wall mobility is found to be enhanced.
- Kab-Jin Kim
- , Se Kwon Kim
- & Teruo Ono
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Letter |
Evidence for magnetic Weyl fermions in a correlated metal
Experimental evidence for the realization of magnetic Weyl fermions in the strongly correlated metal Mn3Sn is reported.
- K. Kuroda
- , T. Tomita
- & S. Nakatsuji
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Letter |
Observation of the spin Nernst effect
The observation of the spin Nernst effect in platinum thin film is reported. This and the spin Hall effects are found to be of similar magnitude.
- S. Meyer
- , Y.-T. Chen
- & S. T. B. Goennenwein
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News & Views |
Magnetization without polarization
A pure electrical generation of magnetization through electrons' valley magnetic moment has been observed in a strained two-dimensional semiconductor.
- Hongyi Yu
- & Wang Yao
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Article |
A magnetic topological semimetal Sr1−yMn1−zSb2 (y, z < 0.1)
Sr1−yMn1−zSb2 (y, z < 0.1) is reported to be a magnetic topological semimetal exhibiting nearly massless relativistic fermions.
- J. Y. Liu
- , J. Hu
- & Z. Q. Mao
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Article |
Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
A multilayer system based on Ir/Fe/Co/Pt repetitions is found to host magnetic skyrmions at room temperature, while allowing control of the skyrmions’ properties such as size and density.
- Anjan Soumyanarayanan
- , M. Raju
- & C. Panagopoulos
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Letter |
Giant thermal Hall effect in multiferroics
Giant coupling between magnetism and phonons — or the giant thermal Hall effect — is reported in the insulating polar magnet (ZnxFe1−x)2Mo3O8.
- T. Ideue
- , T. Kurumaji
- & Y. Tokura
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Letter |
Multi-stimuli manipulation of antiferromagnetic domains assessed by second-harmonic imaging
Sub-coercive electric fields and sub-picosecond light pulses are shown to enable low-power manipulation of antiferromagnetic domains in the multiferroic BiFeO3.
- J.-Y. Chauleau
- , E. Haltz
- & M. Viret
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Letter |
Electric field control of deterministic current-induced magnetization switching in a hybrid ferromagnetic/ferroelectric structure
An electric field is shown to induce an in-plane effective magnetic field enabling the deterministic magnetization switching of a magnetic multilayer on a piezoelectric substrate.
- Kaiming Cai
- , Meiyin Yang
- & Kaiyou Wang
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News & Views |
Let's twist again
The magnetization in a chiral ferromagnetic fluid can be twisted and linked to form a stable three-dimensional topological soliton known as a hopfion.
- Paul Sutcliffe
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News & Views |
Current-switched magnetic insulator
Exploiting the spin Hall effect acting on magnetic oxides outlines an unprecedented path towards low-power, non-volatile spintronics devices.
- Jörg Wunderlich
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Letter |
Universal lower limit on vortex creep in superconductors
A very slow vortex creep in BaFe2(As0.67P0.33)2 films is found experimentally. The authors also claim the existence of a universal lower limit on vortex creep for any superconductor.
- S. Eley
- , M. Miura
- & L. Civale
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News & Views |
Controlling magnetism
Manipulation of the magnetic state in spin valve structures by superconductivity has now been achieved, opening a new route for the development of ultra-fast cryogenic memories.
- Alexander A. Golubov
- & Mikhail Yu. Kupriyanov
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News & Views |
Engineered heterostructures
The combination of topological properties and magnetic order can lead to new quantum states and exotic physical phenomena. In particular, the coupling between topological insulators and antiferromagnets enables magnetic and electronic structural engineering.
- Thorsten Hesjedal
- & Yulin Chen
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News & Views |
Particles or waves
A first-order phase transition between two crystalline phases of magnetic whirls sheds light on the role of topology in magnetic transitions.
- Achim Rosch
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Article |
Current-induced switching in a magnetic insulator
Spin-current-induced magnetization reversal of a perpendicularly magnetized thulium iron garnet film is reported. The spin current is driven by the current flowing through a Pt overlayer.
- Can Onur Avci
- , Andy Quindeau
- & Geoffrey S. D. Beach
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Article |
Tailoring exchange couplings in magnetic topological-insulator/antiferromagnet heterostructures
Heterostructures formed by the magnetic topological insulator Cr-doped (Bi,Sb)2Te and the antiferromagnet CrSb are shown to exhibit emergent interfacial magnetic phenomena that can be tuned with the heterostructure geometry.
- Qing Lin He
- , Xufeng Kou
- & Kang L. Wang
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News & Views |
Magnetically induced
The half-Heusler GdPtBi is found to show transport and calorimetric signatures of the existence of Weyl fermions under the application of a magnetic field. The half-Heusler alloys form a big family of tunable compounds that may substantially enlarge the number of Weyl semimetals known.
- Claudia Felser
- & Binghai Yan
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Letter |
Superconducting exchange coupling between ferromagnets
The superconductivity is found to control the magnetic configuration in GdN/Nb/GdN spin valves as a result of an antiferromagnetic exchange interaction arising from the coupling between the superconducting condensation energy and the magnetic state.
- Yi Zhu
- , Avradeep Pal
- & Zoe H. Barber
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Letter |
Robust metastable skyrmions and their triangular–square lattice structural transition in a high-temperature chiral magnet
A room-temperature metastable skyrmion phase, which undergoes reversible transitions between a triangular and square lattice upon varying the temperature and magnetic field, is found in β-Mn-type Co8Zn8Mn4.
- K. Karube
- , J. S. White
- & Y. Taguchi
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News & Views |
Probing quantum chaos
Giant Rydberg excitons reveal signatures of quantum chaotic behaviour in the presence of time-reversal symmetry breaking enforced by the background solid-state lattice, and they provide a new mesoscopic platform for fundamental studies of quantum chaos.
- Elena A. Ostrovskaya
- & Franco Nori
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News & Views |
A glimpse of spin motion
Ultrashort pulses of X-rays from a free-electron laser capture the spatiotemporal evolution of spins in the different crystallographic directions of a complex magnetic material.
- Fabrizio Carbone
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Letter |
Ultrafast energy- and momentum-resolved dynamics of magnetic correlations in the photo-doped Mott insulator Sr2IrO4
The dynamics of the magnetic correlations after photo-doping Sr2IrO4 are studied through ultrafast time-resolved resonant inelastic X-ray spectroscopy. The timescales are found to depend on the dimensionality of the correlations.
- M. P. M. Dean
- , Y. Cao
- & J. P. Hill
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Article |
Quantum chaos and breaking of all anti-unitary symmetries in Rydberg excitons
Applying an external magnetic field to cuprous oxide causes the energy spacings in the exciton spectrum to transition from a Poissonian distribution to one governed by the Gaussian unitary ensemble statistics, revealing a signature of quantum chaos.
- Marc Aßmann
- , Johannes Thewes
- & Manfred Bayer
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Article |
Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
Inelastic neutron scattering characterization shows that α-RuCl3 is close to an experimental realization of a Kitaev quantum spin liquid on a honeycomb lattice. The collective excitations provide evidence for deconfined Majorana fermions.
- A. Banerjee
- , C. A. Bridges
- & S. E. Nagler
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Letter |
Elastically driven cooperative response of a molecular material impacted by a laser pulse
A cooperative elastic response leads to stabilization of the volume change after light-induced switching of a spin-crossover crystal.
- Roman Bertoni
- , Maciej Lorenc
- & Eric Collet
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Article |
Tuning magnetic anisotropy by interfacially engineering the oxygen coordination environment in a transition metal oxide
The thickness of Ca0.5Sr0.5TiO3 is found to modify the oxygen coordination environment of SrRuO3 in the heterostructure GdScO3/Ca0.5Sr0.5TiO3/SrRuO3, also allowing the magnetic anisotropy to be tuned in the entire SrRuO3 layer.
- Daisuke Kan
- , Ryotaro Aso
- & Yuichi Shimakawa
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Article |
Controlled lateral anisotropy in correlated manganite heterostructures by interface-engineered oxygen octahedral coupling
Strong oxygen octahedral coupling is found to transfer the octahedral rotation between NdGaO3 and La2/3Sr1/3MnO3, allowing manipulation of the heterostructures’ magnetic and electronic anisotropic properties by engineering the oxygen network.
- Z. Liao
- , M. Huijben
- & G. Rijnders
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Letter |
Observation of room-temperature magnetic skyrmions and their current-driven dynamics in ultrathin metallic ferromagnets
Generation of stable skyrmion lattices and displacement of trains of individual skyrmions along a magnetic racetrack by short current pulses are demonstrated at room temperature in ultrathin metallic ferromagnets.
- Seonghoon Woo
- , Kai Litzius
- & Geoffrey S. D. Beach
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News & Views |
A debated origin
Different experimental studies based on nuclear magnetic resonance and inelastic neutron scattering reach opposing conclusions regarding the origin of magnetic nematicity in iron chalcogenides.
- David Vaknin
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Letter |
The classical and quantum dynamics of molecular spins on graphene
The interaction between graphene and the spins of molecular magnets grown on it has been studied. The coupling between graphene phonons, spins and Dirac fermions modifies—and may be used for controlling—the quantum spin dynamics.
- Christian Cervetti
- , Angelo Rettori
- & Lapo Bogani
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Letter |
Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe
Neutron scattering measurements provide evidence for strong coupling between stripe spin fluctuations, nematicity and superconductivity in single-crystalline FeSe.
- Qisi Wang
- , Yao Shen
- & Jun Zhao
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Article |
Néel-type skyrmion lattice with confined orientation in the polar magnetic semiconductor GaV4S8
A Néel-type skyrmion lattice is found to be formed in the lacunar spinel GaV4S8—a polar magnetic semiconductor with rhombohedral symmetry and easy axis anisotropy.
- I. Kézsmárki
- , S. Bordács
- & A. Loidl
Symmetry and magnetism allied
Karl A. Gschneidner Jr (1930–2016)
Spin-liquid ground state