Size effects of optical and magneto-optical properties of epitaxial CrPt3 films

Abstract

Quantitative nanoscale monitoring the effect of annealing process on the morphology and optical properties of poly(3-hexylthiophene)/[6,6]-phenyl C 61 -butyric acid methyl ester thin film used in photovoltaic devicesThe magneto-optical polar Kerr effect and the optical functions of epitaxial films of CrPt 3 have been studied as a function of film thickness. For this purpose, a wedge-shaped film was grown with film thickness ranging from 0 to 100 nm. A Kerr rotation of about 0.25°and -0.5°has been found in the near-ultraviolet and near-infrared spectral range, respectively, for the thicker films, decreasing rapidly with decreasing film thickness. In contrast, the shapes of the Kerr rotation and ellipticity spectra remain nearly unchanged. The optical functions are found to be strongly affected by the film morphology, which was studied by reflection high-energy electron diffraction and atomic force microscopy. The results are in good agreement with effective-medium calculations.

Thickness- and morphology dependence of the optical and magneto-optical properties of CrPt3 films

“…Ellipsometric and MO polar Kerr effect measurements have been performed at room temperature between 1 and 4.2 and 1 and 5 eV, respectively. For the MO Kerr measurements a magnetic field of 2.3 T was applied perpendicular to the substrate.Wedge-shaped samples: While the magneto-optical data show a monotonic variation of the signal size with thickness with saturation beginning around 40 nm, the optical constants vary in an nonmonotonic fashion [5]. With increasing film thickness from 10 to 50 to 85 nm the absorption index k(o) first increases, then decreases to below the values for 10 nm.…”

“…Wedge-shaped samples: While the magneto-optical data show a monotonic variation of the signal size with thickness with saturation beginning around 40 nm, the optical constants vary in an nonmonotonic fashion [5]. With increasing film thickness from 10 to 50 to 85 nm the absorption index k(o) first increases, then decreases to below the values for 10 nm.…”

“…In a second step, the Bruggeman effective medium formula [6] is used to model the islands. With d F =22 nm and an air volume fraction of 0.15 a satisfactory fit of the experimental spectra has been obtained [5].…”

“…The first kind are wedge-shaped samples with film thicknesses from 0 to 100 nm, the results of which have been published recently in Ref. [5] and will only be shortly addressed here. The second kind are films of uniform thickness.…”

Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films

“…With the vibration frequency tuned to the system's natural resonance the sensitivity is increased by a Q-factor, typically 100 [70,154]. crystal orientation [81,155], stoichiometry and film thickness [156,157]. In this chapter, we study the influence of layering and alloy composition on the structural and magnetic properties of magnetron sputtered CrPt 3 films.…”