Title :
Microstructural investigations of fine grain Co-Hf-C films
Author :
Suwabe, S. ; Wong, Bunsen Y. ; Laughlin, David E.
Author_Institution :
Dept. of Mater. Sci. & Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
Microstructural investigations have been performed on Co-Hf-C films which show high μ (>2000), high Bs (1.4 T), and high thermal stability (>700°C). The magnetic properties are very sensitive to the volume fraction of HfC particles. After annealing at 700°C, Co-Hf-C films of the optimum composition consist of a mixture of fine FCC-Co and HfC grains. The grain size of FCC-Co is 10~15 nm and that of HfC is 3~4 nm. The HfC particles are located at the grain boundaries of FCC-Co. HfC was found to crystallize before the FCC-Co, and the fine dispersion of these particles successfully inhibited the grain growth of the FCC-Co
Keywords :
X-ray diffraction examination of materials; annealing; cobalt alloys; coercive force; ferromagnetic properties of substances; grain boundaries; grain size; hafnium alloys; magnetic anisotropy; magnetic permeability; magnetic properties of fine particles; magnetic recording; magnetic thin films; magnetostriction; transmission electron microscope examination of materials; 700 C; CoHfC films; TEM; X-ray diffraction; anisotropy field; annealing; coercivity; electron probe micro analyser; fine grain film; grain boundaries; grain size; magnetic permeability; magnetic properties; magnetic recording; magnetostriction; microstructure; thermal stability; Annealing; Grain size; Hafnium; Hybrid fiber coaxial cables; Magnetic films; Magnetic heads; Magnetic properties; Soft magnetic materials; Sputtering; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
