We study the effects of an attractive interaction between boron (B) and nitrogen (N) atoms doped in a bilayer graphene (BLG), BC14N, on electronic, thermal optical properties for two different types doping process: First, both B N are same layer while other is undoped. Second, layers. An does not influence interlayer first case, it second case. find that strong B-N one induces metallic behavior...

A possible mechanism for a ferromagnetic interaction in the rhombic (Rh) form of C60 (Rh-C60) is suggested on the basis of theoretical studies in relation to cage distortion of the C60 unit in the polymerized 2D-plane. Band structure calculations on Rh-C60 show that cage distortion leads to competition between diamagnetic and ferromagnetic states,which give rise to the possibility of thermally ...

Spin dynamics in the generalized ferromagnetic Kondo model for manganites. Dynamical spin susceptibility is calculated for the generalized ferromagnetic Kondo model which describes itinerant e g electrons interacting with localized t 2g electrons with antiferromagnetic coupling. The calculations done in the mean field approximation show that the spin-wave spectrum of the system in ferromagnetic...

We predict a spin echo in electron transport through layered ferromagnetic-normal-ferromagnetic metal structures: whereas a spin current polarized perpendicular to the magnetization direction decays when traversing a single homogeneous ferromagnet on the scale of the ferromagnetic spin-coherence length, it partially reappears by adding a second identical but antiparallel ferromagnet. This reent...

Ferromagnetism is used to characterize magnetic behavior of a material, such as the strong attraction to a permanent magnet. The origin of this strong magnetism is the presence of a spontaneous magnetization which is produced by a parallel alignment of spins. Instead of a parallel alignment of all the spins, there can be an anti-parallel alignment of unequal spins. This results in a spontaneous...

Ferromagnetic metal rings of nanometre range widths and thicknesses exhibit fundamentally new spin states, switching behaviour and spin dynamics, which can be precisely controlled via geometry, material composition and applied f eld. Following the discovery of the ‘onion state’, which mediates the switching to and between vortex states, a range of fascinating phenomena has been found in these s...

The high temperature phase of the three dimensional random field Ising model is studied using replica symmetry breaking framework. It is found that, above the ferromagnetic transition temperature Tf , there appears a glassy phase at intermediate temperatures Tf < T < Tb while the usual paramagnetic phase exists for T > Tb only. Correlation length at Tb is computed and found to be compatible wit...

Abstract We show that the $4$ -state anti-ferromagnetic Potts model with interaction parameter $w\in (0,1)$ on infinite $(d+1)$ -regular tree has a unique Gibbs measure if $w\geq 1-\dfrac{4}{d+1_{_{\;}}}$ for all $d\geq 4$ . This is tight since it known there are multiple measures when $0\leq w\lt 1-\dfrac{4}{d+1}$ and moreover give new proof of uniqueness $3$ 1-\dfrac{3}{d+1}$ 3$ $d=2$

The functional characteristics of double perovskites with unique ferromagnetic-insulator ground state have been controversial due to the unavoidable presence anti-site disorders (ASDs). Here, we aim investigate origin magnetic ordering on local and global scales in Sm$_{2}$NiMnO$_{6}$ (SNMO) perovskite system. Different calcination routes are exploited generate different cation arrangements SNM...