Magnetic and structural properties of thin Fe films grown on Ni/Si

Effects of the randomly distributed magnetic field on the phase diagrams of the transverse Ising thin film

“…In order to focus on the difference between the ground state longitudinal magnetization of the surface (m 1 ) and that of the inner layer (m L/2 ), we present the variation of the ∆m = m 1 − m L/2 curves with the transverse field at the temperature k B T c /J = 0.001 for some selected values of ∆ s , L and σ in Fig. (7). At this temperature, the energy supplied from the temperature to the system is very small in comparison with the spin-spin interaction, then the situation may be treated as the investigation of ground state magnetization.…”

“…The general trend of variation of ∆m with Ω can be seen in Figs. (7) (a), (e) in the absence of the magnetic field. Rising Ω can not create significant change until Ω/J = 1.0, then |∆m| increases with increasing Ω/J until the specific value of Ω/J for a given ∆ s and L. After then, |∆m| approaches to zero and finally at the value of Ω c /J for a given ∆ s and L, |∆m| falls to zero because all layers exhibit zero magnetization.…”

“…It was experimentally found that, the Curie temperature and the average magnetic moment per atom increases with the increasing thickness of the film [6,7]. Thin films can be modeled by Ising model due to the fact that, many ultrathin films do indeed exhibit a strong uniaxial anisotropy [8].…”

“…Also, the development of the molecular beam epitaxy technique and its application to the growth of thin metallic films has stimulated renewed interest in thin film magnetism. It was experimentally found that, the Curie temperature and the average magnetic moment per atom increases with the increasing thickness of the film [6,7]. Thin films can be modeled by Ising model due to the fact that, many ultrathin films do indeed exhibit a strong uniaxial anisotropy [8].…”

Phase diagrams of a spin-1 Ising superlattice

“…The thickness dependence of most of the properties of these materials is now an established fact. For instance, magnetization measurements of a series of Fe films [2] show that the magnetic moment of Fe depends on the thickness of the film. In ultrathin Ni films grown on Cu(001) [3], a sharp spin reorientation transition at small film thicknesses (from 5 to 7 monolayers) from in-plane to perpendicular magnetization was observed.…”