Recent advances in tunable spin–orbit coupling using ferroelectricity

Fang, Mei; Zhang, Wenchao; Wu, Xiaoyu; Guo, Wang; Xia, Huayan; Wang, Yutai; Wang, Wenbin; Shen, Jian

doi:10.1063/5.0052553

Cited by 10 publications

(4 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Achieving the nonvolatile electric control of the SOT could thus open the way to a disruptive generation of magnetic memories and logic devices, with high-density integration and dynamical reconfigurability. Several approaches have been pursued in this direction, based on the combination of spin Hall effect heavy metal/ferromagnetic heterostructures with piezoelectric 12 , ferroelectric 13 , 14 , and oxide materials 15 – 17 or the replacement of the heavy metal by magnetically doped topological insulators 18 (TIs). However, none of the above methods provide nonvolatile control of SOT together with efficient dynamical inversion of the SOT direction in a structure compatible with magnetic tunnel junction integration.…”

Section: Introductionmentioning

confidence: 99%

Non-volatile electric control of spin-orbit torques in an oxide two-dimensional electron gas

et al. 2023

View full text Add to dashboard Cite

Spin-orbit torques (SOTs) have opened a novel way to manipulate the magnetization using in-plane current, with a great potential for the development of fast and low power information technologies. It has been recently shown that two-dimensional electron gases (2DEGs) appearing at oxide interfaces provide a highly efficient spin-to-charge current interconversion. The ability to manipulate 2DEGs using gate voltages could offer a degree of freedom lacking in the classical ferromagnetic/spin Hall effect bilayers for spin-orbitronics, in which the sign and amplitude of SOTs at a given current are fixed by the stack structure. Here, we report the non-volatile electric-field control of SOTs in an oxide-based Rashba-Edelstein 2DEG. We demonstrate that the 2DEG is controlled using a back-gate electric-field, providing two remanent and switchable states, with a large resistance contrast of 1064%. The SOTs can then be controlled electrically in a non-volatile way, both in amplitude and in sign. This achievement in a 2DEG-CoFeB/MgO heterostructures with large perpendicular magnetization further validates the compatibility of oxide 2DEGs for magnetic tunnel junction integration, paving the way to the advent of electrically reconfigurable SOT MRAMS circuits, SOT oscillators, skyrmion and domain-wall-based devices, and magnonic circuits.

show abstract

Section: Introductionmentioning

confidence: 99%

Non-volatile electric control of spin-orbit torques in an oxide two-dimensional electron gas

et al. 2023

View full text Add to dashboard Cite

show abstract

“…electron gases on the metal surface, and is expected to play an important role as an elemental technology in spintronics. [5][6][7][8][9][10] Considering the spin-orbit interaction in a 2D electron gas, the dispersion relation is expressed as follows:…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, it has become possible to intentionally control the strength of Rashba coupling and design systems for various applications. [5][6][7][11][12][13][14] Some layered polar semiconductors are known to have spin-split bands due to the giant Rashba effect, which originates from the bulk polar atomic configuration. The Rashba parameter, which represents the magnitude of the Rashba effect in these semiconductors, has been reported to be very large, 3-4 eV Å.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1–4 ] The Rashba effect has been demonstrated in quantum wells and thin films based on III–V semiconductors, as well as in 2D electron gases on the metal surface, and is expected to play an important role as an elemental technology in spintronics. [ 5–10 ] Considering the spin‐orbit interaction in a 2D electron gas, the dispersion relation is expressed as follows:

\begin{array}{*{20}{c}}{{E_{\rm{B}}} = {E_0} - \frac{{{\hbar ^2}}}{{2{m^ * }}}{{\left( {{k_{||}} \pm \frac{{\Delta {k_{||}}}}{2}} \right)}^2} = E_0^\prime - \frac{{{\hbar ^2}k_{||}^2}}{{2{m^ * }}} \pm {\alpha _{\rm{R}}}{k_{||}}}\end{array}

where k || (= k x , k y ) represents the wavenumber of the 2D system, and a R is the Rashba parameter expressed in terms of the momentum splitting Δ k || as a R = ħ 2 Δk || /2 m * , which describes the strength of Rashba coupling.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Moue

Kokubo

Mukai

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

Molecular adsorption on noble‐metal surfaces influences the Rashba effect in the Shockley surface state (SS), but the underlying mechanism remains unclear. Melamine is a simple molecule with a symmetric backbone consisting of a heterocyclic ring. It self‐assembles into a rosette‐like superstructures on Au(111) via double intermolecular hydrogen bonds. In this study, the growth process and structure of this hydrogen‐bonded organic framework (HOF) using low‐energy electron diffraction and X‐ray photoemission spectroscopy is revealed. Above room temperature, it is impossible for melamine to be adsorbed on Au(111) as a monomer, but it is adsorbed collectively as a hydrogen‐bonding network. The melamine HOF has a characteristic hexagonal honeycomb structure (MHC), which significantly affects both the structure and electronic states of Au(111). A theoretical approach reveals that MHC induces a hexagonal periodic deformation in the structure of Au(111) and introduces a new periodic potential in the surface electronic system. Angle‐resolved photoemission spectroscopy measurements of MHC/Au(111) indicate that the bulk sp band is strongly folded back, enhancing the Rashba splitting of the SS of Au(111). Furthermore, spin‐ and angle‐resolved photoemission spectroscopy reveals that the enhanced Rashba splitting of the SS by the MHC is the largest reported to date for the adsorption system on Au(111).

show abstract

Ferroelectric Control of Spin‐Orbitronics

Gu,

Zheng,

Jia

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Spin‐orbit coupling refers to the relativistic interaction between the spin and orbital motions of electrons. This interaction leads to numerous intriguing phenomena, including spin‐orbit torques, spin–momentum locking, topological spin textures, etc., that have recently gained prominence in the field of spin‐orbitronics. In particular, the emerging ferroelectric control is recognized and validated as an effective means to enhance energy efficiency across a broad spectrum of spin‐orbitronic devices. Here, cutting‐edge research on ferroelectric control of spin‐orbitronics (FECSO) by means of spontaneous polarization, reversible ferroelectric switching, and multiferroic coupling, are comprehensively reviewed. Two fascinating topics are mainly discussed: topological spin texture and spin‐charge interconversion. The classification of control mechanisms for different interactions in FECSO is summarized first. Then, from the perspective of material classification, the ferroelectric‐controlled spin‐orbit coupling with tunable topological spin texture in oxide systems, magnetic metal multilayers, and 2D van der Waals materials is reviewed. Subsequently, the ferroelectric‐tunable spin‐charge interconversion on heavy metal layers, oxide interfaces, and ferroelectric Rashba semiconductors is highlighted. In the end, the challenges and forthcoming prospects of FECSO are discussed. This work may provide pertinent and forward‐thinking guidance to accelerate the ongoing advancement of this field.

show abstract

Recent advances in tunable spin–orbit coupling using ferroelectricity

Cited by 10 publications

References 92 publications

Non-volatile electric control of spin-orbit torques in an oxide two-dimensional electron gas

Non-volatile electric control of spin-orbit torques in an oxide two-dimensional electron gas

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Ferroelectric Control of Spin‐Orbitronics

Contact Info

Product

Resources

About