LONG-RANGE ORDER AND MAGNETIC-PROPERTIES OF MNXPT1-X THIN-FILMS

Thin films of MnxPt1-x (x = 0.18, 0.22, 0.25, 0.30, 0.34) were prepare d by magnetron sputtering onto quartz substrates. After annealing in v acuum for 1 h at 850 degrees C, X-ray diffraction indicates that the f ilms have the Cu3Au cubic structure (a = 3.87 Angstrom) and are highly textured with the (111) axis along the film normal. These samples hav e a high degree of long-range order, as indicated by the ratio of the intensities of the superlattice (100) and fundamental (200) X-ray diff raction reflections. We report here the results of magnetic and magnet o-optical measurements on these samples over a wide range of temperatu res.