Head parameter sensitivity study of the intrinsic field reversal time

Studies to establish the key head sensitivity parameters affecting the intr insic field reversal time are reported. The effect of supply voltage, eddy current damping, head moment, and turns are investigated using the nonlinea r, eddy current damped, thin-film write head model proposed by Klaassen and Hirko [IEEE Trans. Magn. 32, 3524 (1996)]. The model is realized using PSP ICE circuit simulation. Eddy current time constant dependencies derived by Wood, Williams, and Hong [IEEE Trans. Magn. 26, 2954 (1990)] are used to ex plore materials with magnetizations ranging from 4 pi M-S=10-20 kG, resisti vities of 25 and 125 mu Omega-cm and heads with 10-15 turns. Confirmation o f the above writer sensitivities has been investigated using a short yoke 3 7 turn, high moment, low eddy current CoTaZr inductive head. From the exper imentally determined model parameters, rise time results are computed for a n improved 10 turn writer design. The results are shown to approach or exce ed the limiting dynamics of the spin system. (C) 1999 American Institute of Physics. [S0021-8979(99)30508-9].