Ferrimagnetic Rectangular and Hexagonal Nanoribbons Under an Applied Transverse Magnetic Field

Abstract

An upsurge of research activities is conducted to assess the magnetic properties of graphene nanoribbons with a keen focus on spintronic applications. The critical and compensation characteristics of mixed spin-3/2 and spin-1/2 Ising nanoribbons (Nrbs) with rectangular and hexagonal shapes under a transverse field are explored employing the finite cluster approximation. In the absence of transverse fields, only the rectangular Nrb, may exhibit one or two compensation points. This compensation persists under a transverse field Ω_σ that exclusively affects the spin-1/2 of the σ-sublattice, where the order is destroyed at some J_σ-dependent critical transverse fields at T = 0. Interestingly, the insertion of a transverse field Ω_S acting only on the S-sublattice, demonstrates that the order cannot be destroyed at low temperatures, with the possibility of reentrance as well as tricritical behaviors for rectangular Nrb. Finally, all these behaviors have been confirmed through an analysis of the magnetizations.