Micromagnetic Analysis of Switching Characteristics for Main Pole in Single-Pole-Type Head

Dan WEI  Liang QUAN  

IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.8   pp.1549-1554
Publication Date: 2007/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.8.1549
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress of High-Density Information Storage)
perpendicular recording,  micromagnetics,  SPT head,  switching time,  

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A 3D micromagnetic model is established to analyze the dynamics of single-pole-type (SPT) heads, in which a main pole and a soft underlayer (SUL) are included. It is found that, in an SPT head whose write pole thickness Lm and pole width W are 40 nm each, the throat height should be no greater than the pole tip width to avoid high remnant field at the static state. The influences of the head's parameters and the damping constant on switching time of SPT head are analyzed respectively. The crystalline anisotropy field of SUL is also proved to have great effect on the switching characteristics: a high anisotropy field along the cross-track direction could stabilize the magnetic moments in SUL and greatly shorten the switching time.