Title :
Micromagnetics of a soft underlayer
Author :
Litvinov, Dmitri ; Chomko, Roman M. ; Abelmann, Leon ; Ramstöck, Klaus ; Chen, GaLane ; Khizroev, Sakhrat
Author_Institution :
Seagate Res., Pittsburgh, PA, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
The micromagnetic properties of a soft underlayer in perpendicular media are studied. It is shown that stray fields from a recording layer can substantially modify magnetic properties of soft underlayer material. The degree of modification is determined by the characteristic bit size in the recording layer and by the soft underlayer material magnetic characteristics. It is found that there exists a thin layer within a soft underlayer with reduced permeability. The effects of the presence of such a reduced permeability region within a soft underlayer on both reading and writing processes are discussed
Keywords :
digital magnetic recording; magnetic multilayers; magnetic permeability; perpendicular magnetic recording; characteristic bit size; magnetic recording layer; micromagnetic properties; perpendicular media; reading processes; reduced permeability region; soft underlayer; stray fields; underlayer material magnetic characteristics; writing processes; Magnetic anisotropy; Magnetic materials; Magnetic properties; Magnetic recording; Micromagnetics; Permeability; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Soft magnetic materials; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
