Antiferromagnetism in hexagonal graphene structures: Rings versus dots

Grujić, Marko M.; Tadić, M.; Peeters, F. M.

doi:10.1103/physrevb.87.085434

Cited by 35 publications

(38 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[28][29][30]32 The origin of the spontaneous spin magnetism is still under debate, while it is supposed to be caused by the electron-electron interaction (neglected in this work) with the atomic defects, or highly degenerate edge states in zigzag edges. 13,33,34,63,64 Besides the spin magnetism, the orbital magnetism itself may also be changed by the electron-electron interaction through the modification of the energy band. In triangular zigzag graphene flakes, in particular, it is predicted that the electron-electron interaction may open an energy gap in the edge-state levels.…”

Section: Comparison To Spin Paramagnetismmentioning

confidence: 99%

Orbital magnetism of graphene flakes

Ominato

Koshino

2013

Phys. Rev. B

View full text Add to dashboard Cite

Orbital magnetism is studied for graphene flakes with various shapes and edge configurations using the tight-binding approximation. In the low-temperature regime where the thermal energy is much smaller than to the energy level spacing, the susceptibility rapidly changes between diamagnetism and paramagnetism as a function of Fermi energy, in accordance with the energy level structure. The susceptibility at charge neutral point is generally larger in armchair flake than in zigzag flake, and larger in hexagonal flake than in triangular flake. As the temperature increases, the discrete structures due to the quantum confinement are all gone, and the susceptibility approximates the bulk limit independently of the atomic configuration. The diamagnetic current circulates entirely on the graphene flake at zero temperature, while in increasing temperature it is localized near the edge with the characteristic depth proportional to 1/T. We predict that the diamagnetism of graphene can be observed using the alignment of graphene flakes in a feasible range of magnetic field.Comment: 9 pages, 7 figure

show abstract

Section: Comparison To Spin Paramagnetismmentioning

confidence: 99%

Orbital magnetism of graphene flakes

Ominato

Koshino

2013

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…This can be seen in cases where graphene has been cut into structures with zigzag edge shapes. [39][40][41][42] Examining Fig. 1, along a single zigzag direction there is an imbalance of lattice sites.…”

Section: Magnetism Due To Edge Shapementioning

confidence: 99%

Defect Engineering of 2d Monatomic-Layer Materials

et al. 2013

View full text Add to dashboard Cite

Atomic-thick monolayer two-dimensional materials present advantageous properties compared to their bulk counterparts. The properties and behavior of these monolayers can be modified by introducing defects, namely defect engineering. In this paper, we review a group of common two-dimensional crystals, including graphene, graphyne, graphdiyne, graphn-yne, silicene, germanene, hexagonal boron nitride monolayers and MoS 2 monolayers, focusing on the effect of the defect engineering on these two-dimensional monolayer materials. Defect engineering leads to the discovery of potentially exotic properties that make the field of two-dimensional crystals fertile for future investigations and emerging technological applications with precisely tailored properties.

show abstract

“…Zigzag edges in sp 2 carbon have demonstrated spin ordered properties in such structures as graphene nanoribbons (with bases of graphene45 and coronene6), open nanotubes7, nanowiggles8, nanorings91011, nanomeshes12, nanodots13, and many more1415. While each of these individual structures have interesting properties, spin alignment between graphene layers can become coupled, allowing for more complicated device designs16.…”

mentioning

confidence: 99%

Improved All-Carbon Spintronic Device Design

Bullard

Girão

Owens

et al. 2015

Sci Rep

View full text Add to dashboard Cite

The discovery of magnetism in carbon structures containing zigzag edges has stimulated new directions in the development and design of spintronic devices. However, many of the proposed structures are designed without incorporating a key phenomenon known as topological frustration, which leads to localized non-bonding states (free radicals), increasing chemical reactivity and instability. By applying graph theory, we demonstrate that topological frustrations can be avoided while simultaneously preserving spin ordering, thus providing alternative spintronic designs. Using tight-binding calculations, we show that all original functionality is not only maintained but also enhanced, resulting in the theoretically highest performing devices in the literature today. Furthermore, it is shown that eliminating armchair regions between zigzag edges significantly improves spintronic properties such as magnetic coupling.

show abstract

Antiferromagnetism in hexagonal graphene structures: Rings versus dots

Cited by 35 publications

References 29 publications

Orbital magnetism of graphene flakes

Orbital magnetism of graphene flakes

Defect Engineering of 2d Monatomic-Layer Materials

Improved All-Carbon Spintronic Device Design

Contact Info

Product

Resources

About