Title :
Exchange coupling strength in synthetic ferrimagnetic media
Author :
Inomata, Akihiro ; Abarra, E.N. ; Acharya, B.R. ; Akimoto, H. ; Okamoto, I.
Author_Institution :
Fujitsu Labs. Ltd., Atsugi, Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
The antiferromagnetic exchange coupling strength (Hex) between two CoCrPtB magnetic layers in bilayer synthetic ferrimagnetic media (SFM) is investigated. Hex is found to be inversely proportional to the thickness and magnetization of the initial magnetic layer (L1). Hex also shows a decrease with increasing temperature. An exchange coupling strength of J≈0.05 erg/cm2 was obtained from Hex. For further improvement of thermal stability at higher recording densities, the thickness or magnetic anisotropy of L1 may be increased. On the other hand, for an effective SFM, the coercivity of L1 must be lower than Hex. Therefore, a large Hex is critical for better thermal stabilization
Keywords :
boron alloys; chromium alloys; cobalt alloys; coercive force; exchange interactions (electron); magnetic anisotropy; magnetic hysteresis; magnetic multilayers; magnetic recording; magnetic switching; platinum alloys; remanence; thermal stability; CoCrPtB; antiferromagnetic exchange coupling strength; coercivity; hysteresis loop; initial magnetic layer thickness; magnetic anisotropy; magnetic recording media; remanent magnetization; synthetic ferrimagnetic media; thermal stability; Antiferromagnetic materials; Coercive force; Couplings; Ferrimagnetic materials; Magnetic anisotropy; Magnetic recording; Magnetization; Perpendicular magnetic anisotropy; Temperature; Thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
