npj Spintronics最新文献_第4页

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

Observation and enhancement of room temperature bilinear magnetoelectric resistance in sputtered topological semimetal Pt3Sn 观察并增强溅射拓扑半金属 Pt3Sn 的室温双线性磁电电阻

npj Spintronics Pub Date : 2024-07-17 DOI: 10.1038/s44306-024-00036-1

Yihong Fan, Zach Cresswell, Yifei Yang, Wei Jiang, Yang Lv, Thomas J. Peterson, Delin Zhang, Jinming Liu, Tony Low, Jian-Ping Wang

{"title":"Observation and enhancement of room temperature bilinear magnetoelectric resistance in sputtered topological semimetal Pt3Sn","authors":"Yihong Fan, Zach Cresswell, Yifei Yang, Wei Jiang, Yang Lv, Thomas J. Peterson, Delin Zhang, Jinming Liu, Tony Low, Jian-Ping Wang","doi":"10.1038/s44306-024-00036-1","DOIUrl":"10.1038/s44306-024-00036-1","url":null,"abstract":"Topological semimetal materials have attracted a great deal of attention due to their intrinsic strong spin-orbit coupling, which leads to large charge-to-spin conversion efficiency and novel spin transport behaviors. In this work, we have observed a bilinear magnetoelectric resistance (BMER) of up to 0.0034 nm2A−1Oe−1 in a single layer of sputtered semimetal Pt3Sn at room temperature. Being different from previous works, the value of BMER in sputtered Pt3Sn does not change out-of-plane due to the polycrystalline nature of the Pt3Sn layer. The observation of BMER provides strong evidence of the existence of spin-momentum locking in the sputtered polycrystalline Pt3Sn. By adding an adjacent CoFeB magnetic layer, the BMER value of this bilayer system is doubled compared to the single Pt3Sn layer. This work broadens the material system in BMER study, which paves the way for the characterization of topological states and applications for spin memory and logic devices.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00036-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141639671","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

Wideband coherent microwave conversion via magnon nonlinearity in a hybrid quantum system 通过混合量子系统中的磁子非线性实现宽带相干微波转换

npj Spintronics Pub Date : 2024-07-02 DOI: 10.1038/s44306-024-00035-2

Jiahao Wu, Jiacheng Liu, Zheyu Ren, Man Yin Leung, Wai Kuen Leung, Kin On Ho, Xiangrong Wang, Qiming Shao, Sen Yang

{"title":"Wideband coherent microwave conversion via magnon nonlinearity in a hybrid quantum system","authors":"Jiahao Wu, Jiacheng Liu, Zheyu Ren, Man Yin Leung, Wai Kuen Leung, Kin On Ho, Xiangrong Wang, Qiming Shao, Sen Yang","doi":"10.1038/s44306-024-00035-2","DOIUrl":"10.1038/s44306-024-00035-2","url":null,"abstract":"Frequency conversion is a widely realized physical process in nonlinear systems of optics and electronics. As an emerging nonlinear platform, spintronic devices have the potential to achieve stronger frequency conversion. Here, we demonstrated a microwave frequency conversion method in a hybrid quantum system, integrating nitrogen-vacancy centers in diamond with magnetic thin film CoFeB. We achieve a conversion bandwidth ranging from 0.1 to 12 GHz, presenting an up to 25th order frequency conversion and further display the application of this method for frequency detection and qubits coherent control. Distinct from traditional frequency conversion techniques based on nonlinear electric response, our approach employs nonlinear magnetic response in spintronic devices. The nonlinearity, originating from the symmetry breaking such as domain walls in magnetic films, presents that our method can be adapted to hybrid systems of other spintronic devices and spin qubits, expanding the application scope of spintronic devices and providing a promising on-chip platform for coupling quantum systems.","PeriodicalId":501713,"journal":{"name":"npj Spintronics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44306-024-00035-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141537066","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