Study on magnetic and thermodynamic characteristics of core-shell graphene nanoribbon

Theoretical Study of the Magnetic Properties of a Ferrimagnetic Graphene-Like Nanoribbon: Monte Carlo Treatment

“…Because a strong exchange coupling makes the system more stable, switching to the superparamagnetic phase is more difficult, which means that such a transition can only ECS Journal of Solid State Science and Technology, 2022 11 051005 occur at high temperatures. This conclusion is consistent with the findings of an Effective Field Theory analysis of core-shell graphene nanoribbons, 49 a Monte Carlo-Mean Field Treatment of a mixed Spin-(3/2,7/2) Ising-Type Ferrimagnet. 52 In Fig.…”

“…In experiments, the fork point between zero field-cooled and field-cooled magnetic curves can be used to get T B , 45,46 whereas, the chart peak of the susceptibility graph in the presence of an external magnetic field is commonly used in theoretical investigations. [47][48][49][50][51] Knowing that the blocking temperature (t B ) is one of the most important elements to consider when evaluating magnetic stability in magnetic memory devices, we have shown in Fig. 4c the temperature dependence of the magnetic susceptibility for different r σS .…”

Magnetic properties of a mixed spin-3/2 and spin-2 Ising octahedral chain

“…The Hamiltonian H i(m) includes all contributions associated with the site i(m). They are given by EFT as follows: [23][24][25][26][27][28][29] g b (x) | x=0 , (5) where η a and η b are defined as η 2 a = (S z i ) 2 and η 2 b = (σ z m ) 2 . They are intermediate parameters for the sublattice magnetizations.…”

“…[23][24][25][26] In our previous studies, we have successfully employed an EFT to study magnetic characteristics of nano-systems. [27][28][29][30][31][32][33][34][35] The purpose of this study is to investigate the magnetic properties of the octahedral chain described by the mixed spin Ising model based on the EFT. This method takes into account the correlation of spin itself and is therefore superior to mean field theory.…”

Investigating the magnetic and hysteretic properties of graphyne-based nanostructures: a comparative study of shape effects on critical temperatures, coercivity, and remanence

“…On the other hand, theoretical studies on the magnetic properties of various graphene structures, including nanographene, bilayer or trilayer graphene, and graphyne have been conducted using different calculation techniques such as the mean-field approximation (MFA) [28] and the effective field theory (EFT) [29][30][31][32][33][34][35][36][37], as well as Monte Carlo simulations (MCS) [38][39][40][41][42][43][44][45][46][47][48][49]. In this context, the magnetic properties of graphyne are investigated by the first-principles calculations [18,23,50,51].…”