Title :
Micromagnetic simulation for antiferromagnetically coupled recording media
Author :
Lee, C.H. ; Wang, J.P. ; Chong, T.C.
Author_Institution :
Data Storage Inst., Singapore
fDate :
7/1/2001 12:00:00 AM
Abstract :
Hysteresis properties of the antiferromagnetic-coupled recording film media are studied via micromagnetic simulation. The theoretical model is discussed in detail. The effect of the antiferromagnetic coupling constant J on the hysteresis loop and recording performance is reported. Kink is observed in the hysteresis loop due to the reversal of lower layer magnetization. The kink occurs in the positive field region when |J|>2Ku2t2 (under zero temperature environment). The coercivity increased with the increase of the antiferromagnetic coupling constant. Antiferromagnetically coupled media with kink in positive field region show a smaller transition length and noise. The track edge-noise increased and broadened for AFC media with kink in the negative field region
Keywords :
coercive force; exchange interactions (electron); magnetic hysteresis; magnetic multilayers; magnetic recording noise; magnetic thin films; magnetisation reversal; antiferromagnetic coupling constant; antiferromagnetically coupled recording media; coercivity; hysteresis loop kink; hysteresis properties; lower layer magnetization reversal; micromagnetic simulation; negative field region; positive field region; recording performance; superparamagnetic limit; track edge-noise; zero temperature environment; Antiferromagnetic materials; Coercive force; Couplings; Disk recording; Magnetic films; Magnetic hysteresis; Magnetic recording; Magnetic separation; Magnetization; Micromagnetics;
Journal_Title :
Magnetics, IEEE Transactions on
