| abstract |
MAGNETIC RECORDING TAPE COMPRISING A SUPPORTING MATERIAL AND A COATING COMPRISING A PLURALITY OF PARTICLES, EACH OF SAID PARTICLES COMPRISING A FERRIMAGNETIC MATERIAL SUBSTANTIALLY SURROUNDED BY AN ANTIFERROMAGNETIC MATERIAL, SAID FERRIMAGNETIC MATERIAL BEING MAGNETICALLY COUPLED TO SAID ANTIFERROMAGNETIC MATERIAL BY EXCHANGE ANISOTROPY, EACH OF SAID PARTICLES HAVING AN AVERAGE PARTICLE SIZE BELOW 1 MICRON, A PORE VOLUME ABOVE 0.02 CC. PER GRAM AND A SURFACE AREA ABOVE 2 SQUARE METERS PER GRAM. |