Effect of the Head Field Gradient and the Variance of Coercivity on Transition Jitter and Transition Width

Abstract

The effect of the head field gradient and the variance of coercivity on transition jitter and transition width was studied by means of a calculation using Voronoi cells. In this calculation, reproduced waveform was obtained on the convolution operation of magnetization distribution and head sensitivity function. Reducing the variance of coercivity proved to be effective in reducing transition jitter, as well as steepening the head field gradient. To achieve an areal density of 200 Gbits/inch², a cluster size of 10 nm, a head field gradient of 200 Oe/nm, and a variance of coercivity of 600 Oe are required.