Low moment SUL effects on write performances in a trailing shielded pole PMR head

As the magnetic moment of soft under layer (SUL) decreases, the magnetic saturation during the write process becomes severe. It induces some partial erasures in the media write pattern and results in poor write performance such as an output roll-off and signal-to-noise ratio degradation. This erasur...

Full description

Saved in:
Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 320; no. 22; pp. 2925 - 2930
Main Authors Takano, Kenichi, Guan, Lijie, Zhou, Yuchen, Liu, Yue, Smyth, Joe, Dovek, Moris
Format Journal Article Conference Proceeding
LanguageEnglish
Published Amsterdam Elsevier B.V 01.11.2008
Elsevier
Subjects
Applied sciences
Circuit properties
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Magnetic properties and materials
Micromagnetics
Miscellaneous
Physics
PMR head
Recording and replay of audio and video signals
Storage and reproduction of information
SUL
Switching, multiplexing, switched capacity circuits
Trailing shielded pole
Trailing shielded pole
SUL
Micromagnetics
PMR head
Performance evaluation
High strength current
Perpendicular magnetic recording
Recording head
Rolling
Erasure
Longitudinal field
Magnetic moment
Energy gap
Bubble
Micromagnetism
Selector switch
Damaging
Signal to noise ratio
Online AccessGet full text

Cover

More Information
Summary:As the magnetic moment of soft under layer (SUL) decreases, the magnetic saturation during the write process becomes severe. It induces some partial erasures in the media write pattern and results in poor write performance such as an output roll-off and signal-to-noise ratio degradation. This erasure is due to the head field longitudinal component at the write gap after the transition writing in the trailing shielded pole perpendicular recording head. In case the SUL has low magnetic moment and high write current is inputted, erasure bubble appears next to the write bubble because the head field perpendicular component switches from positive to negative in the polarity. But the erasure appears even without the negative perpendicular field, and the longitudinal head field of the write gap is dominant for the erasure.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.08.046