Magnetic writer for patterned media with increased write field

Abstract

A magnetic writer writes to a magnetic medium including a plurality of tracks that each includes a plurality of isolated magnetic elements for storage of information. The magnetic writer includes a write element having a write element tip having a leading edge, a trailing edge, and first and second side edges extending between the leading edge and the trailing edge. A side shield is proximate thefirst side edge and no shield is proximate the second side edge.

Description

technical field [0001] The present invention relates to magnetic recording systems. More particularly, the present invention relates to magnetic writers with increased write fields for writing to patterned media. Background technique [0002] As areal density increases, smaller bit cells (track width and bit length) are required in magnetic media. However, superparamagnetic instability becomes a problem as the grain volume of recording media (ie, the number of grains in the media per bit cell) decreases in order to control media noise for high areal density recording. The superparamagnetic effect is small enough that the particle volume V no longer satisfies the inequality K u V / k B It is most obvious when T>70. K u is the magnetic crystal anisotropy energy density of the material, k B is the Boltzmann constant, and T is the absolute temperature. When this inequality is not satisfied, thermal energy demagnetizes the stored bits. Therefore, as the particle size is ...

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Problems solved by technology

This can lead to write errors and inadvertent erasure of previously recorded data

Although the effect on the writing process due to tilt can be mitigated somewhat by increasing the length of the write pole, the head-media spacing (HMS) and media thickness cannot be scaled down to the same extent as the write pole width to further Correct for tilt effect

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