A comparative study of alternating write-current-induced pole tip protrusion in perpendicular and longitudinal recording heads

This paper presents a comparative study of alternating write-current-induced pole tip protrusions (WPTP) in perpendicular magnetic recording (PMR) and longitudinal magnetic recording (LMR) heads during writing operation. Both finite element modeling and experimental measurements were performed for t...

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Bibliographic Details
Published in:Journal of applied physics 2008-04, Vol.103 (7), p.07F547-07F547-3
Main Authors: Song, Suping, Pan, Tao, Fang, Dori, Stoev, Kroum, Ho, Michael, Mao, Sining
Format: Article
Language:English
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Summary:This paper presents a comparative study of alternating write-current-induced pole tip protrusions (WPTP) in perpendicular magnetic recording (PMR) and longitudinal magnetic recording (LMR) heads during writing operation. Both finite element modeling and experimental measurements were performed for this study. The results show that the writer resistance and inductance as well as the WPTP of PMR heads are all substantially lower than those of LMR heads within the write-current frequency range under consideration. It is found that the WPTP of a LMR head is mainly attributed to the eddy-current-induced Joule heating in yoke, whereas for a PMR head, the contribution to the WPTP from the Joule heating generated in write coils is comparable to that induced in yoke.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2838284