Abstract
A sequence of rare-earth/transmission-metal (RE-TM) films have been sputter coated and an increase in the coercive force of over six times has been measured for a change in argon pressure from 2 to 10 mTorr. By using small-angle x-ray scattering measurements, a strong correlation has been found between the number or volume of voids and the coercive force in sputtered coatings of RE-TM materials, especially Tb-Fe-Co. A transmission electron microscopy technique has shown that the majority of these voids accumulate in the observed gaps between columns.
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