npj Spintronics最新文献

Strain-insensitive flexible anomalous Hall-effect sensors for interactive wearables. 交互式可穿戴设备应变不敏感柔性异常霍尔效应传感器。

npj Spintronics Pub Date : 2026-01-01 Epub Date: 2026-05-07 DOI: 10.1038/s44306-026-00149-9

Rui Xu, Eduardo Sergio Oliveros-Mata, Gilbert Santiago Canon Bermudez, Tobias Kosub, Minjeong Ha, Emily E Evans, Jessica A-C Liu, Joseph B Tracy, Denys Makarov

{"title":"Strain-insensitive flexible anomalous Hall-effect sensors for interactive wearables.","authors":"Rui Xu, Eduardo Sergio Oliveros-Mata, Gilbert Santiago Canon Bermudez, Tobias Kosub, Minjeong Ha, Emily E Evans, Jessica A-C Liu, Joseph B Tracy, Denys Makarov","doi":"10.1038/s44306-026-00149-9","DOIUrl":"10.1038/s44306-026-00149-9","url":null,"abstract":"Anomalous Hall effect (AHE) sensors present a compelling platform for emerging interactive electronics. Practical integration in flexible electronics, however, has been limited by the large Hall signal drift occurring under mechanical deformation. In this work, we micropatterned Hall crosses with 1.5-nm-Co/1-nm-Pt bilayers on 2.5-μm-thick ultrathin foils, achieving a high sensitivity of 100 Ω T⁻¹ and stable sensing performance down to a bending radius of 200 μm. To ensure stable performance under continuous bending, we employed a zero-offset Hall (ZOH) measurement strategy to decouple mechanical deformation effects from the magnetic response. In this scheme, the current direction through the Hall cross is alternated and the corresponding signals are averaged, effectively canceling out deformation-induced artifacts in the magnetic measurements. Owing to their mechanical conformability and strain-insensitive operation, the ZOH-enabled AHE sensors demonstrate strong potential for interactive wearables, as exemplified in on-skin human-machine interfaces for Morse code communication and on-skin presenter control, as well as in magnetic soft robots with on-board sensing.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"4 1","pages":"27"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13331739/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148393280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser-induced topological spin switching at room temperature in the van der Waals ferromagnet Fe₃GaTe₂. 范德华铁磁体Fe3GaTe2中室温激光诱导的拓扑自旋开关。

npj Spintronics Pub Date : 2026-01-01 Epub Date: 2026-06-01 DOI: 10.1038/s44306-026-00139-x

Charlie W F Freeman, Woohyun Cho, Paul S Keatley, PeiYu Cai, Zekun Xue, Chenghao Yang, Harry Youel, Elton J G Santos, Robert J Hicken, Heejun Yang, Hidekazu Kurebayashi, Murat Cubukcu, Maciej Dąbrowski

{"title":"Laser-induced topological spin switching at room temperature in the van der Waals ferromagnet Fe3GaTe2.","authors":"Charlie W F Freeman, Woohyun Cho, Paul S Keatley, PeiYu Cai, Zekun Xue, Chenghao Yang, Harry Youel, Elton J G Santos, Robert J Hicken, Heejun Yang, Hidekazu Kurebayashi, Murat Cubukcu, Maciej Dąbrowski","doi":"10.1038/s44306-026-00139-x","DOIUrl":"10.1038/s44306-026-00139-x","url":null,"abstract":"We demonstrate room-temperature nucleation and manipulation of topological spin textures in the van der Waals (vdW) ferromagnet Fe3GaTe2 using laser-pulse excitation. Rapid laser-induced heating followed by cooling enables access to the skyrmion bubble state at low fields and drives reversible switching between this state and labyrinth domains. The switching requires a minimum of about 20 pulses, and further reduction of the pulse number is limited by sample degradation at higher fluence. The nucleation occurs at magnetic induction fields as low as 5 mT, which substantially lowers the field requirement compared to slow field-cooling approaches. Micromagnetic simulations attribute this switching to the thermal cycle induced by the laser. Our findings establish vdW ferromagnets as promising candidates for room-temperature, laser-controlled, non-volatile memory storage applications.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"4 1","pages":"24"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13226038/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148159874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetically programmable surface acoustic wave filters: device concept and predictive modeling. 磁可编程表面声波滤波器：器件概念和预测建模。

npj Spintronics Pub Date : 2026-01-01 Epub Date: 2026-03-27 DOI: 10.1038/s44306-026-00132-4

Michael K Steinbauer, Peter Flauger, Matthias Küß, Stephan Glamsch, Emeline D S Nysten, Matthias Weiß, Dieter Suess, Hubert J Krenner, Manfred Albrecht, Claas Abert

{"title":"Magnetically programmable surface acoustic wave filters: device concept and predictive modeling.","authors":"Michael K Steinbauer, Peter Flauger, Matthias Küß, Stephan Glamsch, Emeline D S Nysten, Matthias Weiß, Dieter Suess, Hubert J Krenner, Manfred Albrecht, Claas Abert","doi":"10.1038/s44306-026-00132-4","DOIUrl":"10.1038/s44306-026-00132-4","url":null,"abstract":"Filtering surface acoustic wave (SAW) signals of specified frequencies depending on the strength of an external magnetic field in a magnetostrictive material has garnered significant interest due to its potential scientific and industrial applications. Here, we propose a device that achieves selective SAW attenuation by instead programming its internal magnetic state. To this end, we perform micromagnetic simulations for the magnetoelastic interaction of the Rayleigh SAW mode with spin waves (SWs) in exchange-decoupled Co/Ni islets on a piezoelectric LiTaO3 substrate. Due to the islets exhibiting perpendicular magnetic anisotropy, the stray-field interaction between them leads to a shift in the SW dispersion depending on the magnetic alignment of neighboring islets. This significantly changes the efficiency of the magnetoelastic interaction at specified frequencies. We predict changes in SAW transmission of 52.0 dB/mm at 3.8 GHz depending on the state of the device. For the efficient simulation of the device, we extend a prior energy conservation argument based on analytical solutions of the SW to finite-difference numerical calculations, enabling the modeling of arbitrary magnetization patterns like the proposed islet-based design.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"4 1","pages":"13"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13031121/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147577399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scale-dependent universality class crossover in magnetic skyrmion polymers. 磁性斯基子聚合物的尺度相关泛类交叉。

npj Spintronics Pub Date : 2026-01-01 Epub Date: 2026-09-15 DOI: 10.1038/s44306-026-00157-9

R L Silva, R C Silva, R L Stamps

引用次数: 0

Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields. 高磁场下反铁磁FeRh中铁磁性的超快出现。

npj Spintronics Pub Date : 2025-01-01 Epub Date: 2025-02-03 DOI: 10.1038/s44306-024-00069-6

I A Dolgikh, T G H Blank, A G Buzdakov, G Li, K H Prabhakara, S K K Patel, R Medapalli, E E Fullerton, O V Koplak, J H Mentink, K A Zvezdin, A K Zvezdin, P C M Christianen, A V Kimel

{"title":"Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields.","authors":"I A Dolgikh, T G H Blank, A G Buzdakov, G Li, K H Prabhakara, S K K Patel, R Medapalli, E E Fullerton, O V Koplak, J H Mentink, K A Zvezdin, A K Zvezdin, P C M Christianen, A V Kimel","doi":"10.1038/s44306-024-00069-6","DOIUrl":"10.1038/s44306-024-00069-6","url":null,"abstract":"Ultrafast heating of FeRh by a femtosecond laser pulse launches a magneto-structural phase transition from an antiferromagnetic to a ferromagnetic state. Aiming to reveal the ultrafast kinetics of this transition, we studied magnetization dynamics with the help of the magneto-optical Kerr effect in a broad range of temperatures (from 4 K to 400 K) and magnetic fields (up to 25 T). Three different types of ultrafast magnetization dynamics were observed and, using a numerically calculated H-T phase diagram, the differences were explained by different initial states of FeRh corresponding to a (i) collinear antiferromagnetic, (ii) canted antiferromagnetic and (iii) ferromagnetic alignment of spins. We argue that ultrafast heating of FeRh in the canted antiferromagnetic phase launches practically the fastest possible emergence of ferromagnetism in this material. The magnetization emerges on a time scale of 2 ps, which corresponds to the earlier reported time scale of the structural changes during the phase transition.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"3 1","pages":"5"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11790480/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143257771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inverse-design topology optimization of magnonic devices using level-set method. 基于水平集方法的磁振子器件反设计拓扑优化。

npj Spintronics Pub Date : 2025-01-01 Epub Date: 2025-05-21 DOI: 10.1038/s44306-025-00082-3

Andrey A Voronov, Marcos Cuervo Santos, Florian Bruckner, Dieter Suess, Andrii V Chumak, Claas Abert

{"title":"Inverse-design topology optimization of magnonic devices using level-set method.","authors":"Andrey A Voronov, Marcos Cuervo Santos, Florian Bruckner, Dieter Suess, Andrii V Chumak, Claas Abert","doi":"10.1038/s44306-025-00082-3","DOIUrl":"10.1038/s44306-025-00082-3","url":null,"abstract":"The inverse design approach in magnonics exploits the wave nature of magnons and machine learning to develop logical devices with functionalities that exceed the capabilities of analytical methods. While promising for analog, Boolean, and neuromorphic computing, current implementations face memory limitations that hinder the design of complex systems. This study presents a level-set parameterization method for topology optimization, combined with an adjoint-state approach for memory-efficient simulation of magnetization dynamics. The framework is implemented in NeuralMag, a GPU-accelerated micromagnetic solver featuring a nodal finite-difference scheme and automatic differentiation tools. To validate the method, we optimized the shape of a magnetic nanoparticle by applying constraints to the objective function, and designed a 300 nm-wide yttrium iron garnet demultiplexer achieving frequency-selective spin-wave separation. These results highlight the algorithm's efficiency in exploring local minima across various initial configurations, establishing its utility as a versatile tool for the inverse design of magnonic logic devices.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"3 1","pages":"19"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12095078/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Persistent spin textures, altermagnetism and charge-to-spin conversion in metallic chiral crystals TM₃X₆. 金属手性晶体TM3X6中的持续自旋织构、电磁和电荷-自旋转换。

npj Spintronics Pub Date : 2025-01-01 Epub Date: 2025-11-03 DOI: 10.1038/s44306-025-00109-9

Karma Tenzin, Berkay Kilic, Raghottam M Sattigeri, Zhiren He, Chao Chen Ye, Marcio Costa, Marco Buongiorno Nardelli, Carmine Autieri, Jagoda Sławińska

{"title":"Persistent spin textures, altermagnetism and charge-to-spin conversion in metallic chiral crystals TM3X6.","authors":"Karma Tenzin, Berkay Kilic, Raghottam M Sattigeri, Zhiren He, Chao Chen Ye, Marcio Costa, Marco Buongiorno Nardelli, Carmine Autieri, Jagoda Sławińska","doi":"10.1038/s44306-025-00109-9","DOIUrl":"10.1038/s44306-025-00109-9","url":null,"abstract":"Chiral crystals, due to the lack of inversion and mirror symmetries, exhibit unique spin responses to external fields, enabling physical effects rarely observed in high-symmetry systems. Here, we show that materials from the chiral dichalcogenide family TM3X6 (T = 3d, M = 4d/5d, X = S) exhibit persistent spin texture (PST) - unidirectional spin polarization of states across large regions of the reciprocal space - in their nonmagnetic metallic phase. Using the example of NiTa3S6 and NiNb3S6, we show that PSTs cover the full Fermi surface, a rare and desirable feature that enables efficient charge-to-spin conversion and suggests long spin lifetimes and coherent spin transport above magnetic ordering temperatures. At low temperatures, the materials that order antiferromagnetically become chiral altermagnets, where spin textures originating from spin-orbit coupling and altermagnetism combine in a way that sensitively depends on the orientation of the Néel vector. Using symmetry analysis and first-principles calculations, we classify magnetic ground states across the family, identify cases with weak ferromagnetism, and track the evolution of spin textures and charge-to-spin conversion across magnetic phases and different Néel vector orientations, revealing spin transport signatures that allow one to distinguish Néel vector directions. These findings establish TM3X6 as a tunable platform for efficient charge-to-spin conversion and spin transport, combining structural chirality, persistent spin textures, and altermagnetism.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"3 1","pages":"46"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12583138/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145454126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unidirectional motion of topological defects mediating continuous rotation processes. 拓扑缺陷的单向运动介导连续旋转过程。

npj Spintronics Pub Date : 2025-01-01 Epub Date: 2025-11-17 DOI: 10.1038/s44306-025-00111-1

Marisel Di Pietro Martínez, Luke Alexander Turnbull, Jeffrey Neethirajan, Max Birch, Simone Finizio, Jörg Raabe, Edouard Lesne, Anastasios Markou, María Vélez, Aurelio Hierro-Rodríguez, Marco Salvalaglio, Claire Donnelly

{"title":"Unidirectional motion of topological defects mediating continuous rotation processes.","authors":"Marisel Di Pietro Martínez, Luke Alexander Turnbull, Jeffrey Neethirajan, Max Birch, Simone Finizio, Jörg Raabe, Edouard Lesne, Anastasios Markou, María Vélez, Aurelio Hierro-Rodríguez, Marco Salvalaglio, Claire Donnelly","doi":"10.1038/s44306-025-00111-1","DOIUrl":"10.1038/s44306-025-00111-1","url":null,"abstract":"Topological defects play a crucial role across various fields, mediating phase transitions and macroscopic behaviors as they propagate through space. Their role as robust information carriers has also generated much attention. However, controlling their motion remains challenging, especially towards achieving motion along well-defined paths, which typically require predefined structural patterning. Here, we demonstrate the tunable, unidirectional motion of topological defects in a laterally unconfined thin film. The motion of these defects-specifically magnetic dislocations-is shown to mediate the overall continuous rotation of the stripe pattern in which they are embedded. We determine the connection between the unidirectional motion of dislocations and the underlying three-dimensional (3D) magnetic structure by performing 3D magnetic vectorial imaging with in situ magnetic fields. A minimal model for dislocations in stripe patterns that encodes the symmetry breaking induced by the external magnetic field reproduces the motion of dislocations that facilitate the 2D rotation of the stripes, highlighting the universality of the phenomenon. This work establishes a framework for studying the field-driven behavior of topological textures and designing materials that enable well-defined, controlled motion of defects in unconfined systems, paving the way to manipulate information carriers in higher-dimensional systems.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"3 1","pages":"47"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12623236/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145558897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machine learning for the development of new materials for a magnetic tunnel junction. 机器学习用于磁隧道结新材料的开发。

npj Spintronics Pub Date : 2025-01-01 Epub Date: 2025-07-30 DOI: 10.1038/s44306-025-00094-z

Atsufumi Hirohata, Hiroki Koizumi, Tufan Roy, Masahito Tsujikawa, Shigemi Mizukami, Kenji Nawa, Masafumi Shirai

引用次数: 0

Spin-orbit interaction driven terahertz nonlinear dynamics in transition metals. 过渡金属中自旋轨道相互作用驱动的太赫兹非线性动力学。

npj Spintronics Pub Date : 2025-01-01 Epub Date: 2025-01-27 DOI: 10.1038/s44306-024-00068-7

Ruslan Salikhov, Markus Lysne, Philipp Werner, Igor Ilyakov, Michael Schüler, Thales V A G de Oliveira, Alexey Ponomaryov, Atiqa Arshad, Gulloo Lal Prajapati, Jan-Christoph Deinert, Pavlo Makushko, Denys Makarov, Thomas Cowan, Jürgen Fassbender, Jürgen Lindner, Aleksandra Lindner, Carmine Ortix, Sergey Kovalev

{"title":"Spin-orbit interaction driven terahertz nonlinear dynamics in transition metals.","authors":"Ruslan Salikhov, Markus Lysne, Philipp Werner, Igor Ilyakov, Michael Schüler, Thales V A G de Oliveira, Alexey Ponomaryov, Atiqa Arshad, Gulloo Lal Prajapati, Jan-Christoph Deinert, Pavlo Makushko, Denys Makarov, Thomas Cowan, Jürgen Fassbender, Jürgen Lindner, Aleksandra Lindner, Carmine Ortix, Sergey Kovalev","doi":"10.1038/s44306-024-00068-7","DOIUrl":"10.1038/s44306-024-00068-7","url":null,"abstract":"The interplay of electronic charge, spin, and orbital currents, coherently driven by picosecond long oscillations of light fields in spin-orbit coupled systems, is the foundation of emerging terahertz lightwave spintronics and orbitronics. The essential rules for how terahertz fields interact with these systems in a nonlinear way are still not understood. In this work, we demonstrate a universally applicable electronic nonlinearity originating from spin-orbit interactions in conducting materials, wherein the interplay of light-induced spin and orbital textures manifests. We utilized terahertz harmonic generation spectroscopy to investigate the nonlinear dynamics over picosecond timescales in various transition metal films. We found that the terahertz harmonic generation efficiency scales with the spin Hall conductivity in the studied films, while the phase takes two possible values (shifted by π), depending on the d-shell filling. These findings elucidate the fundamental mechanisms governing non-equilibrium spin and orbital polarization dynamics at terahertz frequencies, which is relevant for potential applications of terahertz spin- and orbital-based devices.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":"3 1","pages":"3"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11772253/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143070691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0