Writing performance of narrow trackwidth single pole perpendicular heads

Abstract

The writing performance of narrow trackwidth single pole heads was studied on double layer perpendicular media. The main pole of the head was made of high moment Fe–Si–N laminated with Si–N. The narrow poles were made by trimming the wide main pole with an FIB milling system. Saturation recording was achieved by a 0.3 μm trackwidth head for media composed of a Co/Pd or Co–Cr–Nb–Pt recording layer and a Ni–Fe–Nb soft magnetic backlayer. With this head, clear recorded patterns were obtained. It was found that the number of reversed magnetic domains decreased remarkably as the trackwidth was reduced. The MFM images of 0.14 μm trackwidth recording at 400 kFRPI reveals a potential for recording densities exceeding 50 Gbit/in.2

Low-dose focused ion beam nanofabrication and characterization by atomic force microscopy

“…Modern commercial systems can provide an ion beam with an intensity profile exhibiting a 10 nm full width at half maximum [1], ångstromscale precision of the ion beam position, and control over the ion dose down to 10 11 ions cm −2 . FIB is already regularly applied using doses of the order of 10 17 ions cm −2 or greater for trimming magnetic read/write heads [2], TEM thin-foil preparation [3], machining of specialized atomic force microscopy cantilevers [4][5][6], and fabrication of structures for micro-contact printing [7]. However, there have been few reports characterizing the topography of features fabricated using a FIB [8,9], and low-dose applications in the range of 10 16 ions cm −2 or less are seldom reported [10].…”

Control of transition shift using DC-bias current

“…Two kinds of the write heads were used as indicated. The head-A [6] is a 17-turns coil and the t r of 17 ns. On the other hand, the head-B is a cusp-field single-pole (CF-SPT) head [7] that has 6-turns coil and the t r of 11 ns.…”

High density recording on ultra-thin Fe-Pt perpendicular composite media

“…A thin-film SPT writing head (Co-Zr-Nb main pole, m, m) on a contact slider[11] and an MR reproducing head ( m, m) were used. The SNR of the media prepared at 300 C decreased with the decrease in the Fe-Pt film thickness, showing the highest SNR of 38.9 dBat 40 kFRPI for the 12.5 nm thick medium.…”