Investigation of High Density Magnetic Recording with Single-layer Perpendicular Media

Abstract

Abstract---This paper describes the recent research results on magnetic recording with single-layer perpendicular recording media. This includes the thermal stability of recorded information, the linear recording density resolution, the recorded track edge profile, the media noise, the nonlinear transition shifts, the signal decay due to demagnetizing field, etc. The combination of Co-alloy single-layer perpendicular media with high perpendicular magnetic anisotropies (Mr/Ms>O.95) and ring-head writing has a high potential to increase the attainable areal density beyond 10 Gb/in 2 while avoiding or reducing the difficulties which are feared to face with the conventional longitudinal magnetic recording.

Using Anomalous Dispersion Effect for Fourier Transform Analysis of X-ray Reflectivity from Thin-Film Stacks

“…Especially, giant magnetoresistive (GMR) spin-valve heads have been investigated for application to high-recording-density hard drives because these heads have high sensitivity for reading magnetic records [1]. Recently, many researchers have studied using perpendicular magnetic-recording media [2] and advanced spin-valve heads with magnetic tunnel junctions for advanced hard drives [3]. The GMR structures consist of two ferromagnetic layers separated by a noble metal spacer with a thickness of a few nanometers.…”

Development of Media Nanostructure for Perpendicular Magnetic Recording

“…The shift was necessary for increasing the Ku value of recording layer, which was directly related with increasing the perpendicular coercivity. When the layer thickness was decreased for Co-alloy recording layer materials to be less than 50 nm, a notable decrease in perpendicular coercivity was observed and the decrease depended on the underlayer material 12,45,46) . Careful examinations of the interface between the Co-alloy recording layer and the underlayer revealed that there was an atomically disordered region of a few nanometers around the interface 38,46,47) .…”

Low noise perpendicular magnetic recording media for deep submicron track width recording

“…P ERPENDICULAR magnetic recording is distinguished from longitudinal magnetic recording by its demagnetizing field free property at higher recording densities [1], so that the time decay in the output voltage is suppressed at higher recording densities [2]. Narrow track recording of deep submicron width is further advantageous in perpendicular recording due to reducing in demagnetizing field also in track width direction [3].…”