Monte Carlo simulation of step effect on molecular‐based magnets

Abstract

Monte Carlo simulation has been used in detail to study the step effect of the hysteresis loop for a ferrimagnetic mixed spin-2 and spin-5/2 Ising model on a honeycomb lattice. The results indicate that the hysteresis loops exhibit an obvious step effect and various shapes for different single-ion anisotropies and exchange couplings at very low temperature. Under a longitudinal magnetic field (h > 0 or h < 0), we have obtained 2S þ 1 magnetic plateaus for different single-ion anisotropies at low temperature. The existence of triple and double hysteresis loop patterns has been found in the system. It is shown that the sublattice anisotropy and the interlayer exchange coupling strongly affect the coercivity of the system. The influence of the interlayer exchange couplings on the total magnetization, susceptibility, internal energy and specific heat with temperature are numerically examined in the absence of the longitudinal field.

Single‐Ion Anisotropy Effect on the Critical and Hysteresis Behaviors of a Mixed‐Spin (1, 3/2) Square Ising Nanowire

“…On decreasing to , multiple loops disappear and the system displays a single loop. It is worth noting that interesting theoretical investigations have reported multicycle hysteresis loops in several magnetic systems, such as molecular‐based magnetic materials, [ 55 ] ferrimagnetic nanoparticles with core‐shell structure, [ 56 ] bilayer film system, [ 57 ] hexagonal nanotube, [ 58 ] cylindrical nanotube, [ 59 ] and square lattice. [ 60 ]…”

“…On decreasing D S =J C to À5, multiple loops disappear and the system displays a single loop. It is worth noting that interesting theoretical investigations have reported multicycle hysteresis loops in several magnetic systems, such as molecular-based magnetic materials, [55] ferrimagnetic nanoparticles with core-shell structure, [56] bilayer film system, [57] hexagonal nanotube, [58] cylindrical nanotube, [59] and square lattice. [60] Now, we describe in Figure 10 the influence of temperature on the hysteresis behavior for D C =J C ¼ À0.5, D S =J C ¼ À2, J in =J C ¼ À0.5, and J S =J C ¼ 0.5.…”

Ferroelectric, quantum efficiency and photovoltaic properties in perovskite BiFeO 3 thin films: First principle calculations and Monte Carlo study

“…In previous works, 30‐34 the multiferroics properties of the mixed spin Ising model are investigated. The Hamiltonian of thin films BiFeO 3 is given by with j 1 (Bi 3+ ‐Bi 3+ ) and j 2 (Bi 3+ ‐Bi 3+ ) are the ferroelectric couplings between the first and second nearest neighbors in thin films BiFeO 3 .…”

Hysteresis Characteristics of Generalized Spin-S Magnetic Binary Alloys

“…A molecular-based magnetic material AF e II F e III (C 2 O 4 ) 3 which corresponds to ferrimagnetic mixed spin-2 and spin-5/2 Ising model on a honeycomb lattice exhibits 2S + 1 magnetic plateaus in the presence of single-ion anisotropies and at low temperatures. Triple and double hysteresis behaviors have been found by means of MC [30] and EFT [31] for the given system.…”