Magnetic Properties of Thin Ferromagnetic Semiconducting Films

Phonon damping in ferromagnetic semiconducting thin films

“…In such systems, for example, in ferromagnetic semiconductors, in rare earth metals, in alloys or in intermetallic compounds containing transition metals, the indirect coupling between the localized moments and the itinerant electrons should be taken into account. Wesselinowa et al [9] have calculated self-consistently the temperature dependence of the layer magnetization and the thickness dependence of the Curie temperature of thin ferromagnetic semiconducting films on the basis of the s-d model. The magnetic properties of thin FCC ð1 1 1Þ and FCC ð1 0 0Þ ferromagnetic and antiferromagnetic itinerant-electron films are studied within the single-band Hubbard model by Wu and Nolting [10].…”

Magnetic Properties of Antiferromagnetic Semiconducting Thin Films

“…Figure 1 shows the layer (4) magnetizations in the direction perpendicular to the film surfaces as a function of the temperature for N ¼ 8 and S ¼ 1=2. At low temperature, the magnetizations of the AFM layers are not fully polarized, while the magnetizations of all FM layers are fully polarized [1]. As seen, at low temperatures, the magnetization of the second layer is smaller compared to that of the surface.…”

“…As seen, at low temperatures, the magnetization of the second layer is smaller compared to that of the surface. The crossover between the magnetizations of the surface and the second layer at low temperatures has no counterpart in ferromagnetic thin films [1,2]. With increasing of J s (or I s ), the crossover point shifts to higher temperatures.…”

“…Equation (10), containing the conduction-electron magnetization hs z n i, too [1], has to be numerically calculated. Due to the assumption of symmetrical surfaces, there are N=2 equations for N=2 layer magnetizations, which have to be solved self-consistently.…”

“…Wesselinowa et al [1] have calculated self-consistently the temperature dependence of the layer magnetization and the thickness dependence of the Curie temperature of thin ferromagnetic semiconducting films on the basis of the s-d model. The magnetic properties of thin fcc (111) and fcc (100) ferromagnetic and antiferromagnetic (AFM) itinerant-electron films were studied within the single-band Hubbard model by Wu and Nolting [2].…”