Recording potential of bit-patterned media

Abstract

A comprehensive analysis of the areal density potential of bit-patterned media recording shows that the recording performance is dominated by written-in errors. The statistical fluctuations of the magnetic properties and the locations of the individual bits lead to error probabilities so that some dots are either not recorded at all or cannot be recorded in the time window necessary to ensure synchronized writing. The highest areal densities are obtained with a combination of a pole head, a soft magnetic underlayer, and a storage medium of the composite type. Areal density scenarios of up to 5 Tbits/ in. 2 are analyzed.

Depth-resolved investigation of the lateral magnetic correlations in a gradient nanocrystalline multilayer

“…Due to the necessary miniaturization of such devices and the proximity of the superparamagnetic limit, 8 the magnetic interaction between the neighboring cells 9 is becoming a more and more important parameter that has to be understood and, hitherto, controlled. Also, it has recently been shown that the dilution of a small amount of magnetic transition metal atoms in a semiconductor matrix can lead to the self organization of well ordered, transition metal rich, magnetic nanocrystals.…”

Probing the A1 to L1 transformation in FeCuPt using the first order reversal curve method

“…Another key issue is the stringent requirement on switching field distribution (SFD) for ultrahigh density HAMR media (<5%), 10,12 where any residual A1 phase could be detrimental. Therefore, a complete understanding of the low anisotropy A1 to high anisotropy L1 0 phase transformation is critical.…”

Perpendicular coercivity enhancement of CoPt/TiN films by nitrogen incorporation during deposition

“…Bit patterned magnetic recording media (BPMR), where each bit is defined by one dot in the patterned dot arrays, is considered to be a promising ultra high density recording technology for the future. [1][2][3][4] In bit patterned media, in order to maximize the signal-to-noise ratio, 5 a continuous magnetic film with perpendicular magnetic anisotropy is patterned into an ordered array to record the data. [6][7][8][9] Another effective way to further increase the signal-to-noise ratio is to increase the aspect ratio (the ratio between the height and the diameter) of each dot.…”