Title :
A magnetic and conversion electron Mossbauer spectral study of amorphous Dy20Fe80-y-Coy thin films
Author :
Fleury-Frenette, K. ; Delwiche, J. ; Grandjean, G. ; Vandormael, D. ; Strivay, D. ; Weber, G. ; Long, Gary J.
Author_Institution :
Inst. de Chimie, Liege Univ., Belgium
fDate :
7/1/2001 12:00:00 AM
Abstract :
Amorphous thin films of Dy20Fe80-yCoy , with 0<y<20 and of ca. 40 nm thickness, have been prepared by sputtering on polyimide substrates. The 295 K conversion electron Mossbauer spectra (CEMS) of these films consist of broadened sextets which have been analyzed with a distribution of hyperfine fields in which the iron moments are oriented perpendicular to the plane of the film, an orientation which is in agreement with the perpendicular magnetic anisotropy observed herein at 295 K by vibrating sample magnetometry. The average hyperfine field and isomer shift increase linearly with increasing Co content. Both increases arise from an increase in the electron occupation of the 3d states as the cobalt content increases
Keywords :
Mossbauer effect; amorphous magnetic materials; cobalt alloys; conversion electron spectra; dysprosium alloys; ferromagnetic materials; hyperfine interactions; iron alloys; magnetic hysteresis; magnetic moments; magnetic thin films; magneto-optical recording; perpendicular magnetic anisotropy; sputtered coatings; 295 K; 40 nm; Dy20Fe80Co; amorphous magnetic thin films; conversion electron Mossbauer spectra; electron occupation; hyperfine fields; iron moments; isomer shift; perpendicular magnetic anisotropy; polyimide substrates; sputtering; vibrating sample magnetometry; Amorphous magnetic materials; Amorphous materials; Electrons; Iron; Magnetic anisotropy; Magnetic films; Perpendicular magnetic anisotropy; Polyimides; Sputtering; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on
