Ground state behaviors of four‐sublattice ferromagnetic–antiferromagnetic double layers

Abstract

Within the framework of the spin-wave theory and retarded Green's functions method, the magnetic properties of four-sublattice ferromagnetic and antiferromagnetic double layers at zero temperature have been investigated. Both ferromagnetic and antiferromagnetic interlayer couplings are considered. The spinwave spectra, sublattice magnetizations and internal energy of the system in the ground state are studied. The numerical results are calculated for different sets of intra-and interlayer coupling interactions. All the exchange couplings are involved in the quantum competition of the system, but the effects of antiferromagnetic exchange couplings play an important role in the balance of the quantum competition.

The analytical treatment of magnetic properties of three-layer ferrimagnetic superlattice

“…In their previous work on the similar problems a group of authors [14][15][16][17][18][19][20] claimed that set I having two positive and one negative energy solution is the only meaningful one, while set II has no meaning at all. There also appear the works of other authors with a similar statement [21,22]. We are now going to show that actually, both systems lead to the same set of relevant physical quantities.…”

Magnetization and phase diagram of a cubic nanowire in the presence of the crystal field and the transverse field

“…Thus it is worthwhile to study the effects of the transverse field, the crystal field and the exchange interactions on the magnetization and the phase diagram of the core/shell cubic nanowire by the use of the transverse Ising model in the frameworks of the effective-field theory with correlations (EFT). In our previous works [25][26][27][28], we successfully employed the EFT to study mixed spin, double layers and multilayers Ising system. To date, the EFT has also been successfully used in many kinds of nanostructure materials, such as nano-films [4] and nanoparticles [29].…”

The FM/AFM bilayer Bethe lattice with FM or AFM interlayer interactions

“…Two T N 's were obtained for q = 6 in the transition regions from the AFM phases to the FM phases at low temperatures, as a result the T N lines show reentrant behavior for q = 6. collinear magnetic arrangements by introducing sublattice structures [19]. Within the framework of the spin-wave theory and retarded Green's functions method, the magnetic properties of four-sublattice FM and AFM double layers at zero temperature have been investigated [20]. The properties of AFM-FM bilayer have been studied using the self-consistent mean-field approximation for Heisenberg Hamiltonian [21].…”