npj Spintronics最新文献_第3页

Unraveling the dynamics of magnetization in topological insulator-ferromagnet heterostructures via spin-orbit torque 通过自旋轨道力矩揭示拓扑绝缘体-铁磁体异质结构中的磁化动态

npj Spintronics Pub Date : 2024-08-02 DOI: 10.1038/s44306-024-00045-0

Taekoo Oh, Naoto Nagaosa

{"title":"Unraveling the dynamics of magnetization in topological insulator-ferromagnet heterostructures via spin-orbit torque","authors":"Taekoo Oh, Naoto Nagaosa","doi":"10.1038/s44306-024-00045-0","DOIUrl":"10.1038/s44306-024-00045-0","url":null,"abstract":"Spin–orbit coupling is a relativistic effect coupling the orbital angular momentum with the spin, which determines the physical properties of condensed matter. For instance, the spin–orbit coupling strongly influences spin dynamics, opening the possibility for promising applications. The topological insulator–ferromagnet heterostructure is a typical example exhibiting spin dynamics driven by current-induced spin–orbit torque. Recent observations of the sign flip of Hall conductivity imply that the spin–orbit torque is strong enough to flip magnetization within this heterostructure. Motivated by this, our study elucidates the conditions governing spin flips by studying the magnetization dynamics. We establish that the interplay between spin-anisotropy and spin–orbit torque plays a crucial role in the magnetization dynamics. Furthermore, we categorize various modes of magnetization dynamics, constructing a comprehensive phase diagram across distinct energy scales, damping constants, and applied frequencies. We also consider the effect of a magnetic field on the magnetization dynamics. This research not only offers insights into controlling spin direction but also charts a new pathway to the practical application of spin–orbit coupled systems.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00045-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968511","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

Current-driven dynamics of antiferromagnetic skyrmions: from skyrmion Hall effects to hybrid inter-skyrmion scattering 反铁磁性天离子的电流驱动动力学：从天离子霍尔效应到混合天离子间散射

npj Spintronics Pub Date : 2024-08-02 DOI: 10.1038/s44306-024-00049-w

Amal Aldarawsheh, Moritz Sallermann, Muayad Abusaa, Samir Lounis

{"title":"Current-driven dynamics of antiferromagnetic skyrmions: from skyrmion Hall effects to hybrid inter-skyrmion scattering","authors":"Amal Aldarawsheh, Moritz Sallermann, Muayad Abusaa, Samir Lounis","doi":"10.1038/s44306-024-00049-w","DOIUrl":"10.1038/s44306-024-00049-w","url":null,"abstract":"Antiferromagnetic (AFM) skyrmions have emerged as a highly promising avenue in the realm of spintronics, particularly for the development of advanced racetrack memory devices. A distinguishing feature of AFM skyrmions is the cancellation of their net topological charge, leading to an anticipated absence of the skyrmion Hall effect (SkHE). Here, we unveil that the latter is finite under the influence of spin-transfer torque, depending on the direction of the injected current impinging on intrinsic AFM skyrmions emerging in Cr/Pd/Fe trilayer on Ir(111) surface. Hinging on first principles combined with atomistic spin dynamics simulations, we identify the origin of the SkHE, which is due to the ellipticity of the skyrmions, and we uncover that FM skyrmions in the underlying Fe layer act as effective traps for AFM skyrmions, confining them and affecting their velocity. These findings hold significant promise for spintronic applications, the design of multi-purpose skyrmion tracks while advancing our understanding of AFM–FM skyrmion interactions and hybrid soliton dynamics in heterostructures.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00049-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968510","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

Noncollinear spin texture-driven torque in deterministic spin–orbit torque-induced magnetization switching 确定性自旋轨道转矩诱导磁化切换中的非共线性自旋纹理驱动转矩

npj Spintronics Pub Date : 2024-08-02 DOI: 10.1038/s44306-024-00048-x

Suhyeok An, Hyeong-Joo Seo, Dongryul Kim, Ki-Seung Lee, Eunchong Baek, Jun-Su Kim, Soobeom Lee, Chun-Yeol You

{"title":"Noncollinear spin texture-driven torque in deterministic spin–orbit torque-induced magnetization switching","authors":"Suhyeok An, Hyeong-Joo Seo, Dongryul Kim, Ki-Seung Lee, Eunchong Baek, Jun-Su Kim, Soobeom Lee, Chun-Yeol You","doi":"10.1038/s44306-024-00048-x","DOIUrl":"10.1038/s44306-024-00048-x","url":null,"abstract":"To reveal the role of chirality on field-free spin–orbit torque (SOT) induced magnetization switching, we propose an existence of z-torque through the formation of noncollinear spin texture during SOT-induced magnetization switching in a laterally two-level perpendicular magnetic anisotropy (PMA) system. For the investigation of torque, we simulate magnetization dynamics in the two-level PMA system with SOT, which generates the noncollinear spin texture. From the spatial distribution of magnetic energy, we reveal the additional z-directional torque contribution in the noncollinear spin texture, which is unexpected in the conventional SOT-induced magnetization switching in collinear spin texture. The z-directional torque originates from the interaction between the chirality of the noncollinear spin texture and the interfacial Dzyaloshinskii-Moriya interaction of the system. Furthermore, the experimental observation of the asymmetric magnetization switching to the direction of the current flow in the two-level PMA system supports our theoretical expectation.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00048-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968512","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

Antiferromagnetic domain wall memory with neuromorphic functionality 具有神经形态功能的反铁磁畴壁存储器

npj Spintronics Pub Date : 2024-07-25 DOI: 10.1038/s44306-024-00027-2

J. Godinho, P. K. Rout, R. Salikhov, O. Hellwig, Z. Šobáň, R. M. Otxoa, K. Olejník, T. Jungwirth, J. Wunderlich

引用次数: 0

Oblique spin injection to graphene via geometry controlled magnetic nanowires 通过几何控制磁性纳米线向石墨烯斜向注入自旋

npj Spintronics Pub Date : 2024-07-25 DOI: 10.1038/s44306-024-00043-2

Jesus C. Toscano-Figueroa, Daniel Burrow, Victor H. Guarochico-Moreira, Chengkun Xie, Thomas Thomson, Irina V. Grigorieva, Ivan J. Vera-Marun

{"title":"Oblique spin injection to graphene via geometry controlled magnetic nanowires","authors":"Jesus C. Toscano-Figueroa, Daniel Burrow, Victor H. Guarochico-Moreira, Chengkun Xie, Thomas Thomson, Irina V. Grigorieva, Ivan J. Vera-Marun","doi":"10.1038/s44306-024-00043-2","DOIUrl":"10.1038/s44306-024-00043-2","url":null,"abstract":"We exploit the geometry of magnetic nanowires, which define 1D contacts to an encapsulated graphene channel, to introduce an out-of-plane component in the polarisation of spin carriers. By design, the magnetic nanowires traverse the angled sides of the 2D material heterostructure. Consequently, the easy axis of the nanowires is inclined, and so the local magnetisation is oblique at the injection point. As a result, when performing non-local spin valve measurements we simultaneously observe both switching and spin precession phenomena, implying the spin population possesses both in-plane and out-of-plane polarisation components. By comparing the relative magnitudes of these components, we quantify the angle of the total spin polarisation vector. The extracted angle is consistent with the angle of the nanowire at the graphene interface, evidencing that the effect is a consequence of the device geometry. This simple method of spin-based vector magnetometry provides an alternative technique to define the spin polarisation in 2D spintronic devices.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00043-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968507","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

Quantum materials for spintronic applications 用于自旋电子应用的量子材料

npj Spintronics Pub Date : 2024-07-25 DOI: 10.1038/s44306-024-00038-z

Yaqin Guo, Xu Zhang, Zhi Huang, Jinyan Chen, Zijun Luo, Jing Zhang, Jingfeng Li, Zhaowei Zhang, Jinkui Zhao, Xiufeng Han, Hao Wu

{"title":"Quantum materials for spintronic applications","authors":"Yaqin Guo, Xu Zhang, Zhi Huang, Jinyan Chen, Zijun Luo, Jing Zhang, Jingfeng Li, Zhaowei Zhang, Jinkui Zhao, Xiufeng Han, Hao Wu","doi":"10.1038/s44306-024-00038-z","DOIUrl":"10.1038/s44306-024-00038-z","url":null,"abstract":"Strong correlation, breaking symmetry, band topology, collective excitation, and quantum confinement represent important features of quantum materials. When quantum materials intersect with spintronics, these key features fundamentally enhance the performance of spin-dependent phenomena. In this review, we examine recent advancements in the material requirements for spintronics and investigate the role of quantum effects in enhancing the functionalization of these devices. Current-induced spin-orbit torques offer a versatile tool to manipulate and excite magnetic order, with decoupled read and write paths that excite various types of materials. One crucial aspect of a spintronic device is the transition of writing layers from traditional transport to quantum transport. The recording layer, on the other hand, employs two-dimensional magnetic materials to achieve the ultimate limit of single-layer magnetic storage. Additionally, the utilization of antiferromagnetic and altermagnetic materials makes them suitable for high-density memories with minimal inter-bit dipole interactions and fast writing speed. Exploiting these emerging quantum materials, in spintronic devices and exploring how quantum effects enhance device functionality show significant potential for spintronic applications in the future.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00038-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968509","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

Structure, control, and dynamics of altermagnetic textures 改磁纹理的结构、控制和动态变化

npj Spintronics Pub Date : 2024-07-25 DOI: 10.1038/s44306-024-00042-3

O. Gomonay, V. P. Kravchuk, R. Jaeschke-Ubiergo, K. V. Yershov, T. Jungwirth, L. Šmejkal, J. van den Brink, J. Sinova

{"title":"Structure, control, and dynamics of altermagnetic textures","authors":"O. Gomonay, V. P. Kravchuk, R. Jaeschke-Ubiergo, K. V. Yershov, T. Jungwirth, L. Šmejkal, J. van den Brink, J. Sinova","doi":"10.1038/s44306-024-00042-3","DOIUrl":"10.1038/s44306-024-00042-3","url":null,"abstract":"We present a phenomenological theory of altermagnets, that captures their unique magnetization dynamics and allows modeling magnetic textures in this new magnetic phase. Focusing on the prototypical d-wave altermagnets, e.g., RuO2, we can explain intuitively the characteristic lifted degeneracy of their magnon spectra, by the emergence of an effective sublattice-dependent anisotropic spin stiffness arising naturally from the phenomenological theory. We show that as a consequence the altermagnetic domain walls, in contrast to antiferromagnets, have a finite gradient of the magnetization, with its strength and gradient direction connected to the altermagnetic anisotropy, even for 180° domain walls. This gradient generates a ponderomotive force in the domain wall in the presence of a strongly inhomogeneous external magnetic field, which may be achieved through magnetic force microscopy techniques. The motion of these altermagentic domain walls is also characterized by an anisotropic Walker breakdown, with much higher speed limits of propagation than ferromagnets but lower than antiferromagnets.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00042-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968508","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

Real-time observation of coherent spin wave handedness 实时观测相干自旋波的手性

npj Spintronics Pub Date : 2024-07-25 DOI: 10.1038/s44306-024-00040-5

Taewoo Ha, Kyung Ik Sim, Howon Lee, Hyun Jun Shin, Sanghoon Kim, Se Kwon Kim, Jae Hoon Kim, Dong-Soo Han, Young Jai Choi, Byung Cheol Park

{"title":"Real-time observation of coherent spin wave handedness","authors":"Taewoo Ha, Kyung Ik Sim, Howon Lee, Hyun Jun Shin, Sanghoon Kim, Se Kwon Kim, Jae Hoon Kim, Dong-Soo Han, Young Jai Choi, Byung Cheol Park","doi":"10.1038/s44306-024-00040-5","DOIUrl":"10.1038/s44306-024-00040-5","url":null,"abstract":"Magnonics, a crucial domain in information science and technology, utilizes spin waves in magnets as efficient information carriers. While antiferromagnets have been suggested for versatile magnonic platform because of the coexistence of right- and left-handed spin waves, their energetic degeneracy poses challenges for observation through spectral measurements, limiting their applicability. Recent observations of distinct spin wave handedness within the gigahertz regime have reported but, are yet to be demonstrated in terahertz (THz) frequencies of antiferromagnetic spin waves. Most of all, the coherence of spin waves is a key aspect of quantum information. Here, employing THz time-domain spectroscopy—a direct, precise, and easy probe for monitoring coherent spin wave dynamics—we discern chiral antiferromagnetic spin waves of opposite phase windings in the time domain, noting their handedness reversal across the angular momentum compensation temperature in ferrimagnets. We establish a principle for directly measuring the handedness of coherent antiferromagnetic spin waves in ferrimagnets with net magnetic moment M ≠ 0 but angular momentum L = 0. Our multidimensional access in the time and spectral domain enables the accurate determination of critical temperature and the dynamic observation of coherent chiral spin waves simultaneously in a single experiment, with potential applications in exploring other quantum chiral entities.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00040-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141804434","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

Nonlinear orbital and spin Edelstein effect in centrosymmetric metals 中心对称金属中的非线性轨道和自旋埃德尔斯坦效应

npj Spintronics Pub Date : 2024-07-17 DOI: 10.1038/s44306-024-00041-4

Insu Baek, Seungyun Han, Suik Cheon, Hyun-Woo Lee

引用次数: 0

An energy efficient way for quantitative magnetization switching 定量磁化切换的节能方法

npj Spintronics Pub Date : 2024-07-17 DOI: 10.1038/s44306-024-00039-y

Xin Li, Hanuman Singh, Jie Lin, Shuai Zhang, Bao Yi, Jyotirmoy Chatterjee, Zhuyun Xiao, Sucheta Mondal, Nobumichi Tamura, Rob N. Candler, Long You, Jeffrey Bokor, Jeongmin Hong

{"title":"An energy efficient way for quantitative magnetization switching","authors":"Xin Li, Hanuman Singh, Jie Lin, Shuai Zhang, Bao Yi, Jyotirmoy Chatterjee, Zhuyun Xiao, Sucheta Mondal, Nobumichi Tamura, Rob N. Candler, Long You, Jeffrey Bokor, Jeongmin Hong","doi":"10.1038/s44306-024-00039-y","DOIUrl":"10.1038/s44306-024-00039-y","url":null,"abstract":"Recent advancements in electrically controlled spin devices have been made possible through the use of multiferroic systems comprising ferroelectric (FE) and ferromagnetic (FM) materials. This progress provides a promising avenue for developing energy-efficient devices that allow for electrically controlled magnetization switching. In this study, we fabricated spin orbit torque (SOT) devices using multiferroic composites and examined the angular dependence of SOT effects on localized in-plane strain induced by an out-of-plane electric field applied to the piezoelectric substrate. The induced strain precisely modulates magnetization switching via the SOT effect in multiferroic heterostructures, which also exhibit remarkable capability to modulate strain along different orientations – a feature with great potential for future applications in logic device arrays. To investigate the influence of electric fields on magnetization switching, harmonic Hall measurements, synchrotron-powered x-ray magnetic circular dichroism-photoemission electron microscopy (XMCD-PEEM), x-ray diffraction (XRD), magnetic force microscopy (MFM), and micromagnetic simulation were conducted. The results demonstrate that electric-field-induced strain enables precise control of SOT-induced magnetization switching with significantly reduced energy consumption, making it highly suitable for next-generation spin logic devices.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00039-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639660","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