Effect of Medium Backlayer Thickness in Narrow Track-width Perpendicular Magnetic Recording.

The effect of the medium backlayer thickness on write performance was investigated using a single-pole head with a narrow track width. It has been reported that the product of Bs and thickness of the medium backlayer must be larger than 1/6 of that of the head main pole for large track widths. Good recording performance was confirmed with a track width as narrow as 0.26 μm while the above condition was satisfied. This means that the above condition is sufficient even for a 0.26-μm-wide track head. Furthermore, results showed a possibility that the product of Bs and thickness of the medium backlayer was reduced in narrow track-width recording.