N. U. S. Yapa

Open University of Sri Lanka | OUSL · Department of Physics

Fourth order perturbed Heisenberg Hamiltonian was employed to determine the magnetic easy and hard directions of fcc structured ferromagnetic thin films with three spin layers. Only the spin exchange interaction, long range dipole interaction and second order magnetic anisotropy terms were taken into account. 3D graphs of total magnetic energy vers...

Ferromagnetic films with bcc structure was investigated using fourth order perturbed Heisenberg Hamiltonian. Magnetic properties of ultrathin films with two spin layers were studied. Only spin exchange interaction, long range dipole interaction and second order magnetic anisotropy were taken into account. 3D plots of total magnetic energy versus an...

Spin reorientation of experimentally synthesized CoPt/AlN and Gd films have been described using third order perturbed Heisenberg Hamiltonian. Easy axis oriented ferromagnetic thin films find potential applications in magnetic memory devices and MMIC. Spin exchange interaction energy, long range dipole interaction energy, magnetic anisotropy energi...

For the first time, the solution of third order perturbed classical Heisenberg Hamiltonian equation with all the seven magnetic parameters including stress induced anisotropy and demagnetization factor is presented in this manuscript. Variation of third order perturbed total energy with applied in plane magnetic field, applied out of plane magnetic...

The solution of third order perturbed Heisenberg Hamiltonian of simple cubic ferromagnetic ultra-thin films with three layers were found. All the magnetic energy parameters such as spin exchange interaction, magnetic dipole interaction, second order magnetic anisotropy, fourth order magnetic anisotropy, applied magnetic field, demagnetization facto...