Large Interfacial Rashba Interaction Generating Strong Spin–Orbit Torques in Atomically Thin Metallic Heterostructures

Krishnia, Sachin; Sassi, Yanis; Ajejas, Fernando; Sebe, Nicolas; Reyren, Nicolas; Collin, Sophie; Denneulin, Thibaud; Kovács, András; Dunin-Borkowski, Rafal E.; Fert, Albert; George, Jean-Marie; Cros, Vincent; Jaffrès, Henri

doi:10.1021/acs.nanolett.2c05091

Cited by 11 publications

(1 citation statement)

References 50 publications

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“…On the other hand, systematic measurements of the resistivity of sputtered Cu layers in a different type of multilayers and the thickness range of our samples led us to estimate the resistivity MFP to about 7 nm (Supplementary Information of 56 ), however that it should be slightly longer if we have not to consider the scattering on interfaces involved in the resistivity MFP. It means that our experiments are in the ballistic regime (at the limit of the transition to diffusive), explaining that we do not observe any square dependence of τ D on d Cu in Fig.…”

Section: Methodsmentioning

confidence: 97%

Orbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments

Xu,

Zhang,

Fert

et al. 2024

Nat Commun

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Orbitronics is based on the use of orbital currents as information carriers. Orbital currents can be generated from the conversion of charge or spin currents, and inversely, they could be converted back to charge or spin currents. Here we demonstrate that orbital currents can also be generated by femtosecond light pulses on Ni. In multilayers associating Ni with oxides and nonmagnetic metals such as Cu, we detect the orbital currents by their conversion into charge currents and the resulting terahertz emission. We show that the orbital currents extraordinarily predominate the light-induced spin currents in Ni-based systems, whereas only spin currents can be detected with CoFeB-based systems. In addition, the analysis of the time delays of the terahertz pulses leads to relevant information on the velocity and propagation length of orbital carriers. Our finding of light-induced orbital currents and our observation of their conversion into charge currents opens new avenues in orbitronics, including the development of orbitronic terahertz devices.

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Section: Methodsmentioning

confidence: 97%

Orbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments

Xu,

Zhang,

Fert

et al. 2024

Nat Commun

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Nonvolatile Memristive Materials and Physical Modeling for In‐Memory and In‐Sensor Computing

Go,

Lim,

Lee

et al. 2024

Small Science

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Separate memory and processing units are utilized in conventional von Neumann computational architectures. However, regarding the energy and the time, it is costly to shuffle data between the memory and the processing entity, and for data‐intensive applications associated with artificial intelligence, the demand is ever increasing. A paradigm shift in traditional architectures is required, and in‐memory computing is one of the non‐von‐Neumann computing strategies. By harnessing physical signatures of the memory, computing workloads are administered in the same memory element. For in‐memory computing, a wide range of memristive material (MM) systems have been examined. Moreover, developing computing schemes that perform in the same sensory network and that minimize the data shuffle between the processing unit and the sensing element is a requirement, to process large volumes of data efficiently and decrease the energy consumption. In this review, an overview of the switching character and system signature harnessed in three archetypal MM systems is rendered, along with an integrated application survey for developing in‐sensor and in‐memory computing, viz., brain‐inspired or analogue computing, physical unclonable functions, and random number generators. The recent progress in theoretical studies that reveal the structural origin of the fast‐switching ability of the MM system is further summarized.

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Large Chiral Orbital Texture and Orbital Edelstein Effect in Co/Al Heterostructure

Nikolaev,

Chshiev,

Ibrahim

et al. 2024

Nano Lett.

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Recent experiments by S. Krishnia et al. [Nano Lett. 2023, 23, 6785] reported an unprecedentedly large enhancement of torques upon inserting thin Al layer in Co/Pt heterostructure that suggested the presence of a Rashba-like interaction at the metallic Co/Al interface. Based on first-principles calculations, we reveal the emergence of a large helical orbital texture in reciprocal space at the interfacial Co layer, whose origin is attributed to the orbital Rashba effect due to the formation of the surface states at the Co/Al interface and where spin−orbit coupling is found to produce smaller contributions with a higher-order winding of the orbital moments. Our results unveil that the orbital texture gives rise to a nonequilibrium orbital accumulation producing large current-induced torques, thus providing an essential theoretical background for the experimental data and advancing the use of orbital transport phenomena in allmetallic magnetic systems with light elements.

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Large Interfacial Rashba Interaction Generating Strong Spin–Orbit Torques in Atomically Thin Metallic Heterostructures

Cited by 11 publications

References 50 publications

Orbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments

Orbitronics: light-induced orbital currents in Ni studied by terahertz emission experiments

Nonvolatile Memristive Materials and Physical Modeling for In‐Memory and In‐Sensor Computing

Large Chiral Orbital Texture and Orbital Edelstein Effect in Co/Al Heterostructure

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