The magnetization of epitaxial nanometric CoFe2O4(001) layers

Ferromagnetic Resonance Investigation of GaMnAs Nanometric Layers

This thesis is dedicated to the study of the magnetic properties of GaMnAs nanometric layers by the ferromagnetic resonance (FMR) technique. Three series of samples have been studied to investigate independently the influence of the strain, the hole concentration and the Mn concentration on the magnetic properties of GaMnAs. In the first series, the Ga1−xMnxAs samples with x=0.07, grown on GaAs...

Photothermal deflection studies of GaAs epitaxial layers.

Photothermal beam deflection studies were carried out with GaAs epitaxial double layers grown on semi-insulating GaAs substrates. The impurity densities in thin epitaxial layers were found to influence the effective thermal diffusivity of the entire structure.

Organic epitaxial layers on organic substrates

Boundary magnetization properties of epitaxial Cr2−xAlxO3 thin films

Boundary magnetization properties of epitaxial Cr2−xAlxO3 thin films" The magnetoelectric antiferromagnet α-Cr 2 O 3 (chromia) is known to possess a roughness insensitive net equilibrium magnetization at the (0001) surface, called boundary magnetization (BM), which is coupled to the bulk antiferromagnetic order parameter. In order to verify whether this symmetry sensitive BM persists in alloys,...

Temperature-Dependent Photoluminescence Characteristics of GeSn Epitaxial Layers

Ge1−xSnx epitaxial heterostructures are emerging as prominent candidates for the monolithic integration of light sources on Si substrates. Here we propose a suitable explanation for their temperature-dependent photoluminescence (PL) that is based upon the so far disregarded optical activity of dislocations. By working at the onset of plastic relaxation, which occurs whenever the epilayer releas...