Challenges for Perpendicular Write Heads at High Recording Density

Abstract

Perpendicular recording technology has become the main stream for 130 Gb/in 2 HDD products. In this paper, challenges in perpendicular write head are discussed. Design tradeoffs and concerns of narrow-track single-pole heads, trailing shield heads, floating TS heads, and wrapped-around-shield (WAS) heads are discussed. Experimental data show that WAS heads provide good narrow track and high linear density performance. An areal density of 343 Gb/in 2 has been achieved at a very aggressive magnetic spacing condition.

Designing magnetics of capped perpendicular media with minor-loop analysis

“…The recording characteristics were evaluated using a spin stand with a shielded-pole writer and a giant magneto-resistive reader. Since a shielded-pole writer can provide a larger head-field gradient in the H c range indicated in Table 2 than a single-pole writer [16], it is expected to suit the capped media better. The recording resolution was defined as the ratio of the signal voltage at 500 kfci (flux changes per inch) to that at 50 kfci.…”

Comparison of media properties between hard/soft stacked composite and capping layer perpendicular recording media

“…An increase in K u in a soft layer will trade off media writeability. The wrapped-aroundshielded head design [24] can help minimize ATE in H/S stacked media.…”

Magnetic force microscopy study on wide adjacent track erasure in perpendicular magnetic write heads

“…The structure of these heads was composed of a main pole (MP) surrounded by magnetic shields, i.e. two side shields (SS), trailing shield (TS) and leading shield (LS) [10,11]. A touch down sensor (TDS) was laid close to the leading shield.…”