Optimization of granular double-layer perpendicular media

Thermal stability and the magnetization process in CoCrPt–SiO2 perpendicular recording media

“…The excellent recording performance of media is due to combination of good microstructural and magnetic properties such as-small grain size, square hysteresis loops, low noise, high anisotropy, and improved thermal stability-among others [1][2][3][4][5][6][7]. Compared to the previous generation of HDD that used longitudinal recording media with random inplane crystallographic texture, a key requirement for the HDD based on perpendicular recording media is in the substantial degree of out-of-plane crystallographic texture that is necessary to achieve high signal-to-noise ratios.…”

Microstructure and switching mechanism of stacked CoCrPt–SiO2 perpendicular recording media

“…CoCrPt-oxide-based perpendicular recording layers (RL) are currently used in the hard disk drives owing to their small grain size, square hysteresis loops, low noise, high anisotropy, and improved thermal stability-among others [1][2][3][4][5][6][7][8][9][10][11][12][13]. In order to magnetically isolate the RL grains and shrink grain sizes further, several routes such as dopants, increased oxygen content and high gas pressure sputtering of the media layer, or of the intermediate layers (IL) have been proposed in the past [5,6,[11][12][13].…”

Novel approaches to high-density perpendicular recording media

“…Currently, the most common SULS used in perpendicular recording media are amorphous materials such as CoTaZr or CoNbZr alloys [8,9]. Therefore, some seedlayers such as Ta, or Ti and underlayers (or intermediate layers (IL)) such as Ru are deposited below the recording layer in order to induce a C-axis growth of Co perpendicular to the film plane [10][11][12][13][14][15]. It has been observed that the deposition of thicker Ru layers usually leads to a narrower C-axis dispersion.…”