POLE TIP RECESSION STUDIES OF HARD CARBON-COATED THIN-FILM TAPE HEADS

Hard carbon coatings were deposited by cathodic are and direct ion bea m deposition techniques on thin-film Al2O3-TiC heads and by the latter technique on thin-film Ni-Zn ferrite heads. Functional accelerated te sts were conducted against metal particle tapes in a linear tape drive . Ion beam carbon coatings on Ni-Zn ferrite acid Al2O3-TiC heads subst antially reduced the pole tip recession observed with uncoated heads. Cathodic are carbon coated Al2O3-TiC heads performed better than uncoa ted heads, but were less effective than the ion beam coating. Pole tip recession increased only if carbon was removed from the pole tip. Thi s suggests that coating effectiveness is determined by its adherence t o the pole tip. In two-wide pole tip heads, wear of the pole adjacent to the substrate was less than that of the other pole. Coatings withst ood accelerated tests and may meet life time requirements of future he ads. (C) 1995 American Institute of Physics.