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紅林 秀和*; 山本 慧; 関 剛斎*; 他9名*
Nature Materials, 25(7), p.1167 - 1174, 2026/07
被引用回数：0 パーセンタイル：0.00(Chemistry, Physical)Spin transfer torques (STTs) control magnetisation by electric currents, enabling a range of nano-scale spintronic applications. They can destabilise the equilibrium magnetisation state by counteracting magnetic relaxation. Here, we maximise the STT effect through a dedicated growth-annealing protocol for CoFeB thin films, such that magnetic anisotropies originating from the interface and shape almost cancel each other. The nearly isotropic magnets enable low-current dynamical stabilisation of the magnetisation in the direction opposite to an applied magnetic field, thereby realising a spintronic analogue of the Kapitza pendulum. In an intermediate current regime, the STT drives large magnetisation vector fluctuations that cover the entire Bloch sphere. The continuous variable associated with the stochastic magnetisation direction may serve as a resource for probabilistic computing and neuromorphic hardware. Our results establish isotropic magnets as a platform to study as-yet-uncharted, far-from-equilibrium spin dynamics including anti-magnonics, with promising implications for unconventional computing paradigms.
-decay of 
TeCox, I.*; Grzywacz, R.*; King, T. T.*; Rykaczewski, K. P.*; 西尾 勝久; 他30名*
Nature, 654(8117), p.52 - 56, 2026/06
被引用回数：0 パーセンタイル：0.00(Multidisciplinary Sciences)The radioactivity of the particle is among the most compelling evidence for the existence of cluster structures in atomic nuclei. During the decay process, a preexisting particle tunnels through the potential barrier formed by the residual nucleus. The degree of preformation of the particle, a strongly bound system of two protons and two neutrons, is extracted from the data by dividing the -decay probability by the barrier penetrability for a given particle energy. The preformation probability changes rapidly near nuclear shell closures, which is direct evidence that clustering is connected to nuclear structure. Enhanced preformation was observed in the lightest -particle emitters, spherical tellurium and xenon isotopes decaying to magic isotopes of tin. Here we show the most extreme case of -particle preformation from the measurement of the decay of tellurium-104 (Te). With a half-life of 7.2
ns, Te is the fastest ground-state -emitting nucleus known so far. The deduced preformation demonstrates that the enhancement is greater for Te than for any other nucleus. One nuclear model that can explain our observation postulates that the particle can exist only in the low-nuclear-matter-density regions on the surface of the nucleus. The uniquely high preformation for Te is attributed to its relation to doubly magic tin-100 (
Sn), creating conditions conducive to form an particle.
小嵐 淳; 伊藤 雅之*; 安藤 麻里子; 國分 陽子; 松枝 誠; Kusin, K.*; Jaya, A.*; Dohong, S.*; 平野 高司*
Nature Communications (Internet), 17, p.4369_1 - 4369_9, 2026/05
被引用回数：0熱帯泥炭地は重要かつ長期的な炭素貯蔵庫であるが、人間活動によって劣化が進み、大気への炭素放出が深刻な懸念となっている。本研究は、インドネシア中部カリマンタンの泥炭地における炭素貯留と放出について、泥炭層と地下水溶存有機炭素の放射性炭素年代測定に基づいて明らかにした。18年間(1996年
2014年)の排水は、数百年から千年もの間、浸水環境で保存されていた炭素5-11kg C m
を放出した。排水に続く火災は、過去3000年間に蓄積された炭素23-32kg C mを放出し、より古い泥炭の分解を誘発した。この知見をインドネシアの撹乱された泥炭地全域に外挿すると、1996年から2014年の間に0.81-3.70Gtの炭素が放出されたことが示唆された。さらに継続的な泥炭の分解によって年間0.03-0.08Gtの炭素が放出され続けており、地球の炭素収支に重大な影響を及ぼしている。
Song, Y.*; Xu, S.*; 大森 俊洋*; 川崎 卓郎; 石川 喜久*; 鬼柳 亮嗣; 貝沼 亮介*
Nature Communications (Internet), 17, p.3747_1 - 3747_8, 2026/04
被引用回数：0 パーセンタイル：0.00(Multidisciplinary Sciences)The elastocaloric effect, driven by stress-induced martensitic transformations, offers a promising route toward efficient and environmentally friendly solid-state cooling. However, its practical implementation has been hindered by an inherent trade-off: materials exhibiting large isothermal entropy changes typically operate over narrow temperature windows, thereby limiting their overall cooling performance. Here, we demonstrate an elastocaloric response in a Ti-Al-Cr superelastic alloy that overcomes this limitation. Direct measurements reveal a pronounced elastocaloric cooling effect over an ultra-wide temperature range of 305 K, from 97 K to 402 K. This temperature span exceeds that predicted by the Clausius-Clapeyron relationship (235 K), indicating a significant deviation from conventional thermodynamic expectations. At room temperature, a large adiabatic temperature change of ~10 K is directly measured, corresponding to a cooling output of 5.76 Jg
and a material coefficient of performance of 4.6, demonstrating competitive cooling performance at practical operating conditions. In addition, the elastocaloric response is maintained over the entire temperature range despite the expected decrease in entropy change at lower temperatures, indicating that the conventional trade-off between temperature span and cooling strength is effectively mitigated. This exceptional behavior originates from a combination of anomalous temperature dependence of the critical stress for martensitic transformation and high mechanical strength, which together enable fully reversible stress-induced transformations across a broad thermal domain. Our findings reveal a new regime of elastocaloric behavior and establish a guiding principle for overcoming the apparent limitations imposed by Clausius-Clapeyron-based descriptions in caloric materials.
Glazyrin, K.*; Spektor, K.*; Bykov, M.*; Carvalho, P. H. B.*; Dong, W.*; K
rmann, F.*; 佐野 亜沙美; 服部 高典; Beyer, D. C.*; Sahlberg, M.*; et al.
Nature Communications (Internet), 17, p.2622_1 - 2622_10, 2026/03
被引用回数：2 パーセンタイル：83.76(Multidisciplinary Sciences)高エントロピー材料の研究は様々な科学分野に貢献し、応用面で興味深い特性を次々と明らかにしている。本研究では、高温高圧下におけるX線・中性子飛行時間法実験および第一原理計算により、カンター合金(CoCrFeNiMn)の水素抵抗性を調査した。我々は、カンター合金組成に基づく面心立方(fcc)型水素化物の形成を報告する。さらに、水素含有量の推定を含むその特性評価を提供する。これらの知見は、高エントロピー合金および高エントロピー水素化物の複雑な化学に関する知見の蓄積に貢献するものである。
吉川 貴史
Nature Physics, 22, p.178 - 179, 2026/02
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)Chiral phonons, quasiparticles of lattice vibrations arising from circular atomic motion, hold potential as carriers of angular momentum for next-generation technologies. Experiments show that they can generate orbital currents under thermal gradients.
酒井 英明*; 木俣 基; 他7名*
Nature Communications (Internet), 16, p.11112_1 - 11112_8, 2026/01
被引用回数：0 パーセンタイル：0.00(Multidisciplinary Sciences)We report two-fold nonreciprocal angular magnetoresistance in the tetragonal layered Dirac material SrMnBi
with parity-time-symmetric antiferromagnetic order in its Mn-Bi layers. By quantitatively modelling the angular and field dependencies using a phenomenological framework, we reveal that the observed nonreciprocal interlayer resistivity arises from the current-induced breaking of four-fold rotoinversion symmetry of the Dirac valleys in the Bi square net adjacent to the Mn-Bi layer. Furthermore, we demonstrate the alignment of parity-time-symmetric antiferromagnetic domains via current-field cooling, achieving electric-magnetic control of the f-wave polarity in momentum space. The observed switchable nonreciprocal transport associated with current-tuneable valley nematicity paves the way for novel antiferromagnetic spintronic and valleytronic applications.
Makarov, S. S.*; Zhakhovsky, V. V.*; Grigoryev, S. Yu.*; Chuprov, P.*; Pikuz, T. A.*; Inogamov, N. A.*; Khokhlov, V. A.*; Petrov, Y. V.*; Perov, E. A.*; Shepelev, V. V.*; et al.
Nature Communications (Internet), 16, p.11504_1 - 11504_13, 2025/12
被引用回数：0 パーセンタイル：0.00(Multidisciplinary Sciences)We demonstrate that a single 9-keV pulse from X-ray free-electron-laser can form a nanoscale mm-long cavity in LiF. The laser-generated shock pressure results in channel formation with >1,000 length-to-diameter aspect ratio. The development of void is analyzed via continuum and atomistic simulations revealing a sequence of processes leading to the final long cavity structure. This work presents the study of mm-long nanochannel formation by a single high-brilliance X-ray free-electron laser pulse.
K
nstle, K.*; 山本 慧; 他7名*
Nature Communications (Internet), 16, p.10116_1 - 10116_8, 2025/11
被引用回数：6 パーセンタイル：74.19(Multidisciplinary Sciences)Strong coupling between distinct quasiparticles in condensed matter systems gives rise to hybrid states with emergent properties. We demonstrate the hybridization of confined phonons and finite-wavelength magnons, forming a magnon-polaron cavity with tunable coupling strength and spatial confinement controlled by the applied magnetic field direction. Our platform consists of a low-loss, single-crystalline yttrium iron garnet (YIG) film coupled to a zinc oxide (ZnO)-based surface acoustic wave (SAW) resonator. This heterostructure enables exceptionally low magnon-polaron dissipation rates below 
/2
1.5 MHz. The observed mode hybridization is well described by a phenomenological model incorporating the spatial profiles of magnon and phonon modes. Furthermore, we report the first observation of Rabi-like oscillations in a coupled SAW-spin wave system, revealing the dynamical formation of magnon-polarons in the time domain. These results establish a platform for engineering hybrid spin-acoustic excitations in extended magnetic systems and enable time-resolved studies of magnon-polaron states.
-wave magnet with commensurate spin helix山田 林介*; Birch, M. T.*; Baral, P. R.*; 奥村 駿*; 中野 遼太*; Gao, S.*; 江澤 雅彦*; 野本 拓也*; Masell, J.*; 石原 由貴*; et al.
Nature, 646(8086), p.837 - 842, 2025/10
被引用回数：24 パーセンタイル：98.19(Multidisciplinary Sciences)Antiferromagnetic states with spin-split electronic structure give rise to novel spintronic, magnonic, and electronic phenomena despite (near-) zero net magnetization. The simplest odd-parity spin splitting, -wave, was originally proposed to emerge from a collective instability in interacting electron systems. Recent theory identifies a distinct route to realise -wave spin-split electronic bands without strong correlations, termed p-wave magnetism. Here we demonstrate an experimental realisation of a metallic -wave magnet.
Gu, Y.*; 吉川 貴史; Bisogni, V.*; 他12名*
Nature, 645(8082), p.900 - 905, 2025/09
被引用回数：7 パーセンタイル：85.25(Multidisciplinary Sciences)Controlling spin currents, i.e., the flow of spin angular momentum, in small magnetic devices is the principal objective of spin electronics, a main contender for future energy efficient information technologies. Surprisingly, a pure spin current has never been measured directly since the associated electric stray fields and/or shifts in the non-equilibrium spin-dependent distribution functions are too small for conventional experimental detection methods optimized for charge transport. Here we report that resonant inelastic X-ray scattering (RIXS) can bridge this gap by measuring the spin current carried by magnons - the quanta of the spin wave excitations of the magnetic order - in the presence of temperature gradients across a magnetic insulator. This is possible due to the sensitivity of the momentum- and energy-resolved RIXS intensity to minute changes in the magnon distribution under non-equilibrium conditions. We use the Boltzmann equation in the relaxation time approximation to extract transport parameters, such as the magnon lifetime at finite momentum, essential for the realization of magnon spintronics.
Zhao, X.*; Zhang, Z.*; 服部 高典; Wang, J.*; Li, L.*; Jia, Y.*; Li, W.*; Xue, J.*; Fan, X.*; Song, R.*; et al.
Nature Communications (Internet), 16, p.7713_1 - 7713_8, 2025/08
被引用回数：6 パーセンタイル：81.24(Multidisciplinary Sciences)熱効果は、固体状態の冷凍技術の一つの解決策の基盤を成すもので、通常は固体状態の相転移付近で発生し、冷凍温度範囲が限定されている。ここでは、前例のない概念である「全温度帯バロカロリック効果」を導入し実現する。すなわち、KPF
において77.5Kから300Kの極めて広い温度範囲(潜在的に4Kまで)で観測される顕著なバカカロリック効果である。この温度範囲は、一般的な室温、液体窒素、液体水素、液体ヘリウムの冷却領域をカバーしている。直接測定されたバーカロリック断熱温度変化は、250MPaの圧力を解放した際に、室温で12K、77.5Kで2.5Kに達する。この効果は、圧力依存性の中性子粉末回折、ラマン散乱解析、第一原理計算により示されるように、菱面体高圧相への持続的な相転移に起因する。構造的不安定性を考慮した熱力学的エネルギーランドスケープを記述する。この独自の全温度帯バロカロリック効果は、従来の多段式シナリオを超えた、高度に適用可能な固体状態冷凍技術への新たなアプローチを提供する。
Chen, Z.*; Gong, W.; Harjo, S.; 川崎 卓郎; Chen, G.*; 他14名*
Nature Communications (Internet), 16, p.6480_1 - 6480_13, 2025/07
被引用回数：12 パーセンタイル：89.35(Multidisciplinary Sciences)Developing alloys with both ultrahigh strength and ductility remains a for- midable scientific challenge, primarily due to the inherent strength-ductility tradeoff. Here, we present an approach to enhance the ductility and strength of a medium-entropy alloy (MEA) featuring a fully recrystallized face-centered cubic/hexagonal close-packed dual-phase ultrafine-grained architecture. This is achieved by activating unusual non-basal slips in the ordered hexagonal close-packed superlattice nanoprecipitates, resulting in this MEA that exhibits remarkable uniform elongation (
) and ultrahigh yield strength (
) across a wide temperature range, particularly at cryogenic temperatures ( 2100 MPa, 15%). The non-basal slips in the secondary phase are activated at ultrahigh stress levels, which are compatible with the increased yield strength of the MEA attained through multiple strengthening mechanisms, including grain boundaries, lattice friction, and second-phase nanoprecipitates provided by the multi-principal elements of the entropy alloy. The deformation mechanism elucidated in this work not only leverages the significant strengthening and strain hardening effects of brittle nanoprecipitates but also enables the ductilization of the alloy through sequential non-basal slip during ongoing deformation.
Liu, R.*; Stone, M. B.*; Gao, S.*; 中村 充孝; 蒲沢 和也*; Krajewska, A.*; Walker, H. C.*; Cheng, P.*; Yu, R.*; Si, Q.*; et al.
Nature Communications (Internet), 16, p.5212_1 - 5212_8, 2025/06
被引用回数：5 パーセンタイル：81.47(Multidisciplinary Sciences)The quantum-disordered state in FeSe, intertwined with superconductivity and nematicity, has been a research focus in iron-based superconductors. Temperature-dependent differences between Q= (1, 0) and (0, 1) spin excitations above the structural transition unambiguously reveals the nematic quantum disordered state. Comparison with NaFeAs suggests the Neel excitations originate from enhanced 3dxy orbital correlations. Modeling the stripe dispersions using a J1-K-J2 Heisenberg Hamiltonian, we establish a spininteraction phase diagram, positioning FeSe near a crossover regime between the antiferroquadrupolar, Neel, and stripe orders. Our results provide key insights into themicroscopic spin interactions and their role in the intertwined orders in iron-based superconductors.
Bi
Park, P.*; Ortiz, B. R.*; Spargue, M.*; Sakuya, A. P.*; Chen, S. A.*; Frontzek, M. D.*; Tian, W.*; Sibille, R.*; Mazzone, D. G.*; 田端 千紘; et al.
Nature Communications (Internet), 16, p.4384_1 - 4384_9, 2025/05
被引用回数：17 パーセンタイル：97.29(Multidisciplinary Sciences)Kagome metals with van Hove singularities (VHSs) near the Fermi level can host intriguing quantum phenomena, including chiral loop currents, electronic nematicity, and unconventional superconductivity. However, unconventional magnetic states driven by VHSs, such as spin-density waves (SDWs), have yet to be observed experimentally in kagome metals. Here, we present a comprehensive investigation of the magnetic and electronic structure of the layered kagome metal CeTiBi, where the Ti kagome electronic structure interacts with a magnetic sublattice of Ce
= 1/2 moments. Our findings establish the rare-earth Kagome metals LnTi3Bi4 as a model platform where characteristic electronic structure of the kagome lattice plays a pivotal role in magnetic order.
Li, X. Y.*; Nocera, A.*; Foyevtsova, K.*; Sawatzky, G. A.*; Oudah, M.*; 村井 直樹; 古府 麻衣子*; 松浦 直人*; 玉造 博夢; Aronson, M. C.*
Nature Materials, 24(5), p.716 - 721, 2025/05
被引用回数：3 パーセンタイル：66.99(Chemistry, Physical)Electronic correlations lead to heavy quasiparticles in three-dimensional (3D) metals, and their collapse can destabilize magnetic moments. It is an open question whether there is an analogous instability in one-dimensional (1D) systems, unanswered due to the lack of metallic spin chain materials. We report neutron scattering measurements and density matrix renormalization group calculations establishing spinons in the correlated metal TiMnBi
, confirming that its magnetism is 1D. TiMnBi is inherently frustrated, forming near a quantum critical point that separates different phases at temperature T = 0. One-dimensional magnetism dominates at the lowest T, and is barely affected by weak interchain coupling. TiMnBi is a previously unrecognized metallic spin chain in which 3D conduction electrons become strongly correlated due to their coupling to 1D magnetic moments.
Sheng, L.*; 山本 慧; 他18名*
Nature Physics, 21(5), p.740 - 745, 2025/05
被引用回数：18 パーセンタイル：97.83(Physics, Multidisciplinary)Controlling the spin current lies at the heart of spintronics and its applications. In ferromagnets, the sign of spin currents is fixed once the current direction is determined. However, spin currents in antiferromagnets can possess opposite polarizations, but this requires enormous magnetic fields to lift the degeneracy between the two modes. Therefore, controlling spin currents with opposite polarization is still a challenge. Here we demonstrate the control of spin currents at room temperature by magnon interference in a canted antiferromagnet, namely, haematite that has recently been classified as an altermagnet. Magneto-optical characterization by Brillouin light scattering reveals that the spatial periodicity of the beating patterns is tunable via the microwave frequency. We further observe that the inverse spin Hall voltage changes sign as the frequency is tuned, evincing a frequency-controlled switching of polarization of pure spin currents. Our work highlights the use of antiferromagnetic magnon interference to control spin currents, which substantially extends the horizon for the emerging field of coherent antiferromagnetic spintronics.
Thennakoon, A.*; 横倉 涼雅*; Yang, Y.*; 梶本 亮一; 中村 充孝; 林 真弘*; 道岡 千城*; Chern, G.-W.*; Broholm, C.*; 植田 浩明*; et al.
Nature Communications (Internet), 16, p.3939_1 - 3939_13, 2025/04
被引用回数：3 パーセンタイル：74.19(Multidisciplinary Sciences)The pursuit of quantum spin liquid (QSL) states in condensed matter physics has drawn attention to kagome antiferromagnets (AFM) where a two-dimensional corner-sharing network of triangles frustrates conventional magnetic orders. While quantum kagome AFMs based on Cu
(
, 
) ions have been extensively studied, there is so far little work beyond copper-based systems. Here we present our bulk magnetization, specific heat and neutron scattering studies on single crystals of a new titanium fluorides Cs
RbK
Ti
F
where Ti (
, ) ions form a modulated quantum kagome antiferromagnet that does not order magnetically down to 1.5 K. Our comprehensive map of the dynamic response function 
acquired at 1.5 K where the heat capacity is 
-linear reveals a dispersive continuum emanating from soft lines that extend along (100). The data indicate fractionalized spinon-like excitations with quasi-one-dimensional dispersion within a quasi two-dimensional spin system.
Song, Y.*; Xu, S.*; 佐藤 駿介*; Lee, I.*; Xu, X.*; 大森 俊洋*; 長迫 実*; 川崎 卓郎; 鬼柳 亮嗣; Harjo, S.; et al.
Nature, 638, p.965 - 971, 2025/02
被引用回数：46 パーセンタイル：99.40(Multidisciplinary Sciences)In advanced applications like aerospace and space exploration, materials must balance lightness, functionality, and extreme thermal fluctuation resistance. Shape-memory alloys show promise with strength, toughness, and substantial strain recovery due to superelasticity, but maintaining low mass and effective operation at cryogenic temperatures is challenging. We hereby introduce a novel shape-memory alloy that adheres to these stringent criteria. Predominantly composed of Ti and Al with a chemical composition of Ti
Al
Cr
, this alloy 25 is characterized by a low density (4.36
10
kg/m) and a high specific strength (18510 Pa
m/kg) at room temperature, while exhibiting excellent superelasticity. The superelasticity, owing to a reversible stress-induced phase transformation from an ordered body-centered cubic parent phase to an ordered orthorhombic martensite, allows for a recoverable strain exceeding 7%. Remarkably, this functionality persists across a broad range of temperatures, from deep cryogenic 4.2 K to above room temperature, arising from an unconventional temperature dependence of transformation stresses. Below a certain threshold during cooling, the critical transformation stress inversely correlates with temperature. We interpret this behavior from the perspective of a temperature-dependent anomalous lattice instability of the parent phase. This alloy holds potential in everyday appliances requiring flexible strain accommodations, as well as components designed for extreme environmental conditions such as deep space and liquefied gases.
Yoon, J.-Y.*; 竹内 祐太朗*; 武智 涼太*; Han, J.*; 内村 友宏*; 山根 結太*; 金井 駿*; 家田 淳一; 大野 英男*; 深見 俊輔*
Nature Communications (Internet), 16, p.1171_1 - 1171_8, 2025/02
被引用回数：9 パーセンタイル：89.98(Multidisciplinary Sciences)Spin-orbit torque (SOT) provides a promising mechanism for electrically encoding information in magnetic states. Unlike existing schemes, where the SOT is passively determined by the material and device structures, an active manipulation of the intrinsic SOT polarity would allow for flexibly programmable SOT devices. Achieving this requires electrical control of the current-induced spin polarization of the spin source. Here we demonstrate a proof-of-concept current-programmed SOT device. Using a noncollinear-anti-ferromagnetic/nonmagnetic/ferromagnetic MnSn/Mo/CoFeB hetero-structure at zero magnetic eld, we show current-induced switching in the CoFeB layer due to the spin current polarized by the magnetic structure of the MnSn; by properly tuning the driving current, the spin current from the CoFeB further reverses the magnetic orientation of the MnSn, which determines the polarity of the subsequent switching of the CoFeB. This scheme of mutual switching can be achieved in a spin-valve-like simple protocol because each magnetic layer serves as a reversible spin source and target magnetic electrode. It yields intriguing proof-of-concept functionalities for unconventional logic and neuromorphic computing.
