Effect of Write Current Waveform on Magnetization and Head-Field Dynamics of Perpendicular Recording Heads

• Published in: IEEE transactions on magnetics Vol. 42; no. 10; pp. 2264 - 2266
• Main Authors: Scholz, W., Batra, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.10.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coil current; Coils; Cross-disciplinary physics: materials science; rheology; Dynamics; Equations; Exact sciences and technology; Finite element methods; head-field dynamics; Magnetic anisotropy; Magnetic heads; Magnetic recording heads; Magnetism; Magnetization; Magnetostatic waves; Materials science; Micromagnetics; Other topics in materials science; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Physics; Polarity; Poles; Waveforms; write head; Yokes; Coils; Proceedings; Magnetization; head-field dynamics; Wave forms; write head; Magnetic heads; perpendicular magnetic recording; Magnetic recording; Magnetic properties; Coil current
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2006.878632

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