Title :
Magnetic properties of electron beam evaporated CoPt alloy thin films
Author :
Yamada, Yoshiyasu ; Suzuki, Takao ; Abarra, E. Noel
Author_Institution :
Inf. Storage Mater. Lab., Toyota Technol. Inst., Nagoya, Japan
fDate :
9/1/1997 12:00:00 AM
Abstract :
A systematic study of magnetic properties of CoPt alloy thin films as a function of composition and substrate deposition temperature has been carried out. The concentration dependence of the intrinsic perpendicular magnetic anisotropy constant Ku at ambient temperature reveals a maximum at about 25 at% Pt. Films of Co75 Pt25 deposited onto Al2O3 (0001) substrates held at temperatures from 180°C to 400°C exhibit a strong perpendicular magnetic anisotropy (1.5×107 erg/cm3). This strong anisotropy is closely related to the ordered state of the hcp structure
Keywords :
cobalt alloys; coercive force; electron beam deposition; ferromagnetic materials; magnetic thin films; perpendicular magnetic anisotropy; perpendicular magnetic recording; platinum alloys; vacuum deposited coatings; 180 to 400 degC; Al2O3; Al2O3 (0001) substrates; Co75Pt25; Co75Pt25 films; ambient temperature; composition; concentration dependence; electron beam evaporated CoPt alloy thin films; hcp structure; high density magnetic recording; intrinsic perpendicular magnetic anisotropy constant; magnetic properties; ordered state; strong perpendicular magnetic anisotropy; substrate deposition temperature; Anisotropic magnetoresistance; Coercive force; Diffraction; Electron beams; Glass; Magnetic films; Magnetic properties; Silicon compounds; Substrates; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
