---The effects of thermal transients after write, changes in stress-magnetostriction products and dynamic domain instabilities on popcorn noise probabilities in micro Flexhead® components were studied., It was observed that popcorn noise probabilities in micro Flexhead® components increase as the write current duration increases, until they saturate, with a specific write current amplitude. With increasing write current amplitude, the initial rate of change of noise probability with write current duration increases. In some cases where the resultant stress-magnetostriction products in micro Flexhead® components are negative, popcorn noise probabilities were observed to increase exponentially as functions of applied stress gradients. High rates of occurrence of dynamic domain instabilities have also been correlated with micro Flexhead® components that have high popcorn noise probabilities. Therefore. high probabilities of popcorn noise in micro Flexhead® components are caused by the combined effects of thermal transients after write, changes in stress-magnetostriction products and dynamic domain instabilities. Finally. an inductance fluctuation measurement technique was shown to be useful in quickly detecting micro Flexhead® components that are susceptible to popcorn noise.

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A bstmct -Perpendicular recording probe heads using high moment FeAlNlNiFe laminated magnetic materials as poles were fabricated and tested. FeAlNh'iFe films with a saturation magnetization of 18 KG, a coercivity of 1.0 Oe, and an anisotropy field of 8 Oe, were developed for application in Micro FlexheadTM components. When tested on CoCrTaNFe double layer disks, the high moment heads showed superior overwrite performance and nearly equivalent isolated pulse width compared with typical CoZrNb heads. Vertical domain walls perpendicular to the as-deposited easy-axis of the poles were observed with a scanning magneto-optic photometer and correlated to the read amplitude variations.

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