Neutron diffraction study and specific heat of antiferromagnetic NiI2

Billerey, D.; Terrier, C.; Ciret, N.; Kleinclauss, J.

doi:10.1016/0375-9601(77)90863-5

Cited by 22 publications

(12 citation statements)

References 7 publications

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“… Below 75 K, the magnetic structure in the layers is a helix of type 1 with the spins of Ni 2+ lying in a plane with an angle of about 55° to the c axis. Different layers are coupled by antiferromagnetic interaction. − Figure b exhibits the schematic diagram of interlayer antiferromagnetic ordering and structure phase transitions in bulk NiI 2 . , …”

Section: Resultsmentioning

confidence: 99%

Vapor Deposition of Magnetic Van der Waals NiI₂ Crystals

Liu

Wang

et al. 2020

ACS Nano

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The recent discovery of van der Waals magnetic materials has attracted great attention in materials science and spintronics. The preparation of ultrathin magnetic layers down to atomic thickness is challenging and is mostly by mechanical exfoliation. Here, we report vapor deposition of magnetic van der Waals NiI2 crystals. Two-dimensional (2D) NiI2 flakes are grown on SiO2/Si substrates with a thickness of 5–40 nm and on hexagonal boron nitride (h-BN) down to monolayer thickness. Temperature-dependent Raman spectroscopy reveals robust magnetic phase transitions in the as-grown 2D NiI2 crystals down to trilayer. Electrical measurements show a semiconducting transport behavior with a high on/off ratio of 106 for the NiI2 flakes. Lastly, density functional theory calculation shows an intralayer ferromagnetic and interlayer antiferromagnetic ordering in 2D NiI2. This work provides a feasible approach to epitaxy 2D magnetic transition metal halides and also offers atomically thin materials for spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Vapor Deposition of Magnetic Van der Waals NiI₂ Crystals

Liu

Wang

et al. 2020

ACS Nano

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“…Neutron diffraction has confirmed that this compound undergoes a first magnetic transition at T N,1 ∼ 76 K to an antiferromagnetic state with ferromagnetic (FM) planes. A second transition to a helimagnetic (HM) state that displays a finite electric polarization is observed at low temperatures (T N,2 ∼ 59.5 K) [34][35][36]. Consequently, T N,2 is not only the transition temperature to a HM, but to a multiferroic state in the bulk crystal.…”

Section: Helimagnetic State In the Monolayermentioning

confidence: 99%

Microscopic origin of multiferroic order in monolayer NiI₂

Fumega

Lado

2022

2D Mater.

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The discovery of multiferroic behavior in monolayer NiI2 provides a new symmetry-broken state in van der Waals monolayers, featuring the simultaneous emergence of helimagnetic order and ferroelectric order at a critical temperature of T=21 K. However, the microscopic origin of multiferroic order in NiI2 monolayer has not been established, and in particular, the role of non-collinear magnetism and spin-orbit coupling in this compound remains an open problem. Here we reveal the origin of the two-dimensional multiferroicity in NiI2 using first-principles electronic structure methods. We show that the helimagnetic state appears as a consequence of the long-range magnetic exchange interactions, featuring sizable magnetic moments in the iodine atoms. We demonstrate that the electronic density reconstruction accounting for the ferroelectric order emerges from the interplay of non-collinear magnetism and spin-orbit coupling. We demonstrate that the ferroelectric order is controlled by the iodine spin-orbit coupling, and leads to an associated electronically-driven distortion in the lattice. Our results establish the microscopic origin of the multiferroic behavior in monolayer NiI2, putting forward the coexistence of helical magnetic order and ligand spin-orbit coupling as driving forces for multiferroic behavior in two-dimensional materials.

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“…Heat capacity data show that NiI 2 undergoes two phase transitions upon cooling, at 75 and 60 K [128]. Helimagnetic order develops at 75 K, and the phase transition at 60 K is crystallographic [41].…”

Section: Nixmentioning

confidence: 99%

Crystal and Magnetic Structures in Layered, Transition Metal Dihalides and Trihalides

2017

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Materials composed of two dimensional layers bonded to one another through weak van der Waals interactions often exhibit strongly anisotropic behaviors and can be cleaved into very thin specimens and sometimes into monolayer crystals. Interest in such materials is driven by the study of low dimensional physics and the design of functional heterostructures. Binary compounds with the compositions MX 2 and MX 3 where M is a metal cation and X is a halogen anion often form such structures. Magnetism can be incorporated by choosing a transition metal with a partially filled d-shell for M, enabling ferroic responses for enhanced functionality. Here a brief overview of binary transition metal dihalides and trihalides is given, summarizing their crystallographic properties and long-range-ordered magnetic structures, focusing on those materials with layered crystal structures and partially filled d-shells required for combining low dimensionality and cleavability with magnetism.

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Neutron diffraction study and specific heat of antiferromagnetic NiI2

Cited by 22 publications

References 7 publications

Vapor Deposition of Magnetic Van der Waals NiI₂ Crystals

Vapor Deposition of Magnetic Van der Waals NiI₂ Crystals

Microscopic origin of multiferroic order in monolayer NiI₂

Crystal and Magnetic Structures in Layered, Transition Metal Dihalides and Trihalides

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Neutron diffraction study and specific heat of antiferromagnetic NiI2

Cited by 22 publications

References 7 publications

Vapor Deposition of Magnetic Van der Waals NiI2 Crystals

Vapor Deposition of Magnetic Van der Waals NiI2 Crystals

Microscopic origin of multiferroic order in monolayer NiI2

Crystal and Magnetic Structures in Layered, Transition Metal Dihalides and Trihalides

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Product

Resources

About

Vapor Deposition of Magnetic Van der Waals NiI₂ Crystals

Vapor Deposition of Magnetic Van der Waals NiI₂ Crystals

Microscopic origin of multiferroic order in monolayer NiI₂