Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
This article describes a bump disk which is used for flying-height calibration of a head in a glide height tester. As shown in the figure, the bump disk is provided with a plurality of projections, each of which is 0.5 mm in diameter and 1000 to 3000 angstroms in height, for example. This bump disk consists of a normal magnetic disk on which the projections are formed by sputtering. Each sputtered projection comprises two layers, i.e., an upper carbon layer and a lower chromium layer. This bump disk is easy to make and has high size accuracy and durability for the projections compared with conventional bump disks having projections formed by physical deformation and electroplating.