Stress and temperature stabilities for Ba-ferrite perpendicular magnetic recording media have been investigated. Stress-induced decrease rate in remanent magnetization for the media was found as small (1 × 10-5 per kg/cm2) as those for metal and Co-γFe2O3 media. Remanent magnetization in a perpendicular direction remains almost constant in a −10 to 80°C temperature range. Output decreases after 120 minutes still mode reproducing with 8 mm VCR, and 10 million passes with a 3.5 inch FDD were less than 1 dB. These results confirm the excellent stability of the Ba-ferrite recording media.
