Multiferroicity in atomic van der Waals heterostructures

Gong, Cheng; Kim, Eun Mi; Wang, Yuan; Lee, Geunsik; Zhang, Xiang

doi:10.1038/s41467-019-10693-0

Cited by 258 publications

(167 citation statements)

References 36 publications

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“…By using a 2×2 supercell of monolayer Sc2CO2 to match bilayer CrI3, as shown in Figure 1a, the in-plane lattice mismatch can be reduced to be less than 2%, which is widely accepted in first-principles studies. [49][50][51] Monolayer Sc2CO2 is predicted to exhibit both in-plane and out-of-plane electric polarizations. 19 Free-standing monolayer Sc2CO2 exhibits an out-of-plane electric polarization of 1.60 C/cm 3 , which is reported to be the largest for a monolayer material.…”

Section: Resultsmentioning

confidence: 99%

Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures

Lü

Fei

et al. 2020

ACS Appl. Mater. Interfaces

100

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Multiferroic materials with coupled ferroelectric and ferromagnetic properties are important for multifunctional devices due to their potential ability of controlling magnetism via electric field, and vice versa. The recent discoveries of twodimensional ferromagnetic and ferroelectric materials have ignited tremendous research interest and aroused hope to search for two-dimensional multiferroics.However, intrinsic two-dimensional multiferroic materials and, particularly, those with strong magnetoelectric couplings are still rare to date. In this paper, using firstprinciples simulations, we propose artificial two-dimensional multiferroics via a van der Waals heterostructure formed by ferromagnetic bilayer chromium triiodide (CrI3) and ferroelectric monolayer Sc2CO2. In addition to the coexistence of ferromagnetism and ferroelectricity, our calculations show that, by switching the electric polarization of Sc2CO2, we can tune the interlayer magnetic couplings of bilayer CrI3 between ferromagnetic and antiferromagnetic states. We further reveal that such a strong magnetoelectric effect is from a dramatic change of the band alignment induced by the strong build-in electric polarization in Sc2CO2 and the subsequent change of the interlayer magnetic coupling of bilayer CrI3. These artificial multiferroics and enhanced magnetoelectric effect give rise to realizing multifunctional nanoelectronics by van der Waals heterostructures.

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Section: Resultsmentioning

confidence: 99%

Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures

Lü

Fei

et al. 2020

ACS Appl. Mater. Interfaces

100

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“…Scientists have built various heterostructures from the ferroelectric (FE) and ferromagnetic (FM) materials. Not only the coexistence of ferroelectricity and ferromagnetism, but also the magnetoelectric couplings were achieved in these HSs [1,4,12]. Since the first prediction of 2D FE hydroxyl-decorated graphene in 2013, more and more 2D FE materials have been discovered, e.g., SnSe, SnS, GeS, Bi 2 O 2 Se, and Bi 2 O 2 Te (in-plane FE) [13,14], as well as MoS 2 , CuInP 2 S 6 , In 2 Se 3 , and MXenes (perpendicular FE) [13,15].…”

Section: Introductionmentioning

confidence: 95%

“…Thesore, the co-existence of these two ferroic orders in 2D materials is very attractive. The singlephase multiferroics are extremely rare because ferroelectricity arising from the off-center cations requires empty d-orbitals, while ferromagnetism usually results from partially occupied dorbitals [12]. Scientists have built various heterostructures from the ferroelectric (FE) and ferromagnetic (FM) materials.…”

Section: Introductionmentioning

confidence: 99%

Tunable Magnetic Anisotropy and Dzyaloshinskii-Moriya Interaction in an Ultrathin van der Waals Fe3GeTe2/In2Se3 Heterostructure

Chen

Sun

et al. 2020

Front. Phys.

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The promise of future spintronic devices with nanoscale dimension, high-density, and low-energy consumption motivates the search for van der Waals heterostructure that stabilize topologically protected whirling spin textures such as magnetic skyrmions and domain walls. To translate these compelling features into practical devices, a key challenge lies in achieving effective manipulation of the magnetic anisotropy energy and the Dzyaloshinskii-Moriya (DM) interaction, the two key parameters that determine skyrmions. Through the first-principles calculation, we demonstrate that the polarization-induced broken inversion symmetry in the two-dimensional Fe 3 GeTe 2 /In 2 Se 3 multiferroic heterostructure does cause an interfacial DM interaction. The strong spin-orbit coupling triggers the magnetic anisotropy of the Fe 3 GeTe 2 /In 2 Se 3 heterostructure. The magnetic anisotropy and the DM interaction in Fe 3 GeTe 2 can be well-controlled by the ferroelectric polarization of In 2 Se 3. This work paves the way toward the spintronic devices based on van der Waals heterostructures.

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“…Ultrathin thickness of channels can facilitate fast heat dissipation and quick response to external stimuli. Moreover, 2D materials can be vertically stacked on arbitrary materials, enabling rich device operations and physics . The number of reports on 2D materials‐based synaptic devices has accordingly increased rapidly.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Synaptic Devices Based on 2D Materials

Sun

Wang

Yang

2020

Advanced Intelligent Systems

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Diverse synaptic plasticity with a wide range of timescales in biological synapses plays an important role in memory, learning, and various signal processing with exceptionally low power consumption. Emulating biological synaptic functions by electric devices for neuromorphic computation has been considered as a way to overcome the traditional von Neumann architecture in which separated memory and information processing units require high power consumption for their functions. Synaptic devices are expected to conduct complex signal processing such as image classification, decision‐making, and pattern recognition in artificial neural networks. Among various materials and device architectures for synaptic devices, 2D materials and their van der Waals (vdW) heterostructures have been attracting tremendous attention from researchers based on their capacity to mimic unique synaptic plasticity for neuromorphic computing. Herein, the basic operations of biological synapses and physical properties of 2D materials are discussed, and then 2D materials and their vdW heterostructures for advanced synaptic operations with novel working mechanisms are reviewed. In particular, there is a focus on how to design synaptic devices with the vdW structures in terms of critical 2D materials and their limitations, providing insight into the emerging synaptic device systems and artificial neural networks with 2D materials.

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Multiferroicity in atomic van der Waals heterostructures

Cited by 258 publications

References 36 publications

Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures

Artificial Multiferroics and Enhanced Magnetoelectric Effect in van der Waals Heterostructures

Tunable Magnetic Anisotropy and Dzyaloshinskii-Moriya Interaction in an Ultrathin van der Waals Fe3GeTe2/In2Se3 Heterostructure

Recent Progress in Synaptic Devices Based on 2D Materials

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