Study of magnetic properties of graphene nanostructures and graphene nanoribbons

Bagheri, B.; Fazileh, F.
December 2011
Iranian Journal of Physics Research;Winter2011, Vol. 11 Issue 4, p58
Academic Journal
The discovery of graphene and its remarkable electronic and magnetic properties has initiated great research interest in this material. Furthermore, there are many derivatives in these graphene related materials among which graphene nanoribbons and graphene nanofragments are candidates for future carbon-based nanoelectronics and spintronics. Theoretical studies have shown that magnetism can arise in various situations such as point defects, disorder and reduced dimensionality. Using a mean field Hubbard model, we studied the appearance of magnetic textures in zerodimensional graphene nanofragments and one-dimensional graphene zigzag nanoribbons. Among nanofragments, triangular shape, bowtie and coronene were studied. We explain how the shape of these materials, the imbalance in the number of atoms belonging to the graphene sublattices, the existence of zero-energy states and the total and local magnetic moments were related. At the end, we focused on the effects of a model disorder potential (Anderson-type), and illustrate how density of states of zigzag nanoribbons was affected.


Related Articles

  • Effects of Strain on Notched Zigzag Graphene Nanoribbons. Baldwin, Jack; Hancock, Y. // Crystals (2073-4352);Mar2013, Vol. 3 Issue 1, p38 

    The combined effects of an asymmetric (square or V-shaped) notch and uniaxial strain are studied in a zigzag graphene nanoribbon (ZGNR) device using a generalized tight-binding model. The spin-polarization and conductance-gap properties, calculated within the Landauer--Büttiker formalism,...

  • Electric field control of spin-resolved edge states in graphene quantum nanorings. Farghadan, R.; Saffarzadeh, A. // Journal of Applied Physics;2014, Vol. 115 Issue 17, p174310-1 

    The electric-field effect on the electronic and magnetic properties of triangular and hexagonal graphene quantum rings with zigzag edge termination is investigated by means of the single-band tight-binding Hamiltonian and the mean-field Hubbard model. It is shown how the electron and spin states...

  • Role of Vacancies in Zigzag Graphene Nanoribbons: An Ab initio Study. Tarawneh, Khaldoun; Al-Aqtash, Nabil // Journal of Nano Research;2014, Vol. 27, p65 

    We have studied the effects of vacancies on the structural, electronic and magnetic properties of zigzag-edged graphene nanoribbons (ZGNRs). Our calculations were carried out using an ab initio density functional pseudopotential computational method combined with the generalized gradient...

  • Spin-dependent transport and spin-switching effect in graphene with magnetoelectric modulations. Nojoon Myoung; Ihm, G. // Journal of Applied Physics;Mar2011, Vol. 109 Issue 5, p053716 

    We investigate spin transport through magnetic potential structures in single graphene layer with the consideration of Zeeman effect. We find that the magnetic step leads to the spin-dependent transport, and the spin-polarized conductance has the oscillatory behavior as a function of fermion...

  • First-Principles Study on the Electronic and Magnetic Properties of Zigzag AlN-SiC Nanoribbons. Du, Xiu-Juan; Chen, Zheng; Zhang, Jing; Ning, Zhao-Rong; Fan, Xiao-Li // Journal of Superconductivity & Novel Magnetism;Apr2014, Vol. 27 Issue 4, p1079 

    The electronic and magnetic properties of zigzag AlN-SiC nanoribbons are investigated by using the first-principles calculations. The band structures reveal that all the investigated AlN-SiC systems are the magnetic semiconductors, the band gaps of which decrease with the increasing width of the...

  • Electronic structures of graphane sheets with foreign atom substitutions. Yanli Wang; Yi Ding; Siqi Shi; Weihua Tang // Applied Physics Letters;4/18/2011, Vol. 98 Issue 16, p163104 

    Using first-principles calculations, we investigate the electronic structures of the recently synthesized hydrogenated graphene, called graphane, with substitutional B, N, P, and Al atoms. We find that both the n-type and p-type substitutions can cause the semiconductor-to-metal transitions in...

  • First Principles Study of Electronic and Magnetic Properties of Co-Doped Armchair Graphene Nanoribbons. Li, Biao; Xu, Dahai; Zhao, Jun; Zeng, Hui // Journal of Nanomaterials;10/4/2015, Vol. 2015, p1 

    Using the first principles calculations, we have studied the atomic and electronic structures of single Co atom incorporated with divacancy in armchair graphene nanoribbon (AGNR). Our calculated results show that the Co atom embedded in AGNR gives rise to significant impacts on the band...

  • Quantized conductance in an atom-size bridge made from magnetic materials. Morigaki, Y.; Nakanishi, H.; Kasai, H.; Okiji, A. // Journal of Applied Physics;9/1/2000, Vol. 88 Issue 5, p2682 

    Investigates how the magnetic properties of atom-size bridges affect the quantum transport of electrons through them using the Hubbard model. Calculation of the corresponding total energy of the electron system of the atom-size bridge; Induction of changes in the magnetic state by stretching...

  • Spin filter and molecular switch based on bowtie-shaped graphene nanoflake. Kang, Jun; Wu, Fengmin; Li, Jingbo // Journal of Applied Physics;Nov2012, Vol. 112 Issue 10, p104328 

    The magnetic and transport properties of bowtie-shaped graphene nanoflake (BGNF) are investigated from first principles calculations. The eigen states of ferromagnetic (FM) BGNF near Fermi level are found to be delocalized over the whole flake, whereas those of antiferromagnetic (AFM) BGNF are...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics