Title :
Effect of Write Current Waveform on Magnetization and Head-Field Dynamics of Perpendicular Recording Heads
Author :
Scholz, Werner ; Batra, Sharat
Author_Institution :
Seagate Res., Pittsburgh, PA
Abstract :
The response of perpendicular magnetic recording heads with a single turn and two turn coils is calculated using a full micromagnetic model, including return pole and soft underlayer. We study the effect of coil current waveforms with different rise times and overshoots. For fast coil current rise times, the head field shows very little response, until the coil current changes its polarity and it is limited by the intrinsic magnetization dynamics. Even the effect of overshoot is limited by the same mechanism. Shorter yoke length and coil turns close to the air-bearing surface improve the head-field dynamics
Keywords :
magnetic heads; micromagnetics; perpendicular magnetic recording; soft magnetic materials; air-bearing surface; head-field dynamics; intrinsic magnetization dynamics; micromagnetic model; perpendicular magnetic recording heads; shorter yoke length; soft underlayer; write current waveform; write head; Coils; Equations; Finite element methods; Magnetic anisotropy; Magnetic heads; Magnetization; Magnetostatic waves; Micromagnetics; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Coil current; head-field dynamics; perpendicular magnetic recording; write head;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.878632
